Ticketweb users are being sent phishing emails following an attack on company's email server

Users of ticket-reselling website Ticketweb are being warned to contact their banks if they have fallen victim to a phishing email scam that followed the breach of the company's emails system.

The company said however that none of its users' credit card details had been accessed by the cybercriminals.

However, it is believed that since the email system was compromised on 11 February, some users have received up to four phishing emails at a time, and Ticketweb said anyone who clicked on the link and entered their details must contact their bank.

The only good news is that security firm Garlik said its examination of the emails showed that although the links led to a phishing site, it had found no evidence of further malicious software.

"We have checked the scam link through 'Virus Total' and it does not appear it contains any malicious software, so we believe that this was purely a phishing attack designed to trick customers in to sharing personal and financial information," the company said in a statement.

Ticketweb, which acknowledged two days ago that its email system had been breached by hackers, issued the warning yesterday to people not to click on links in the emails, allegedly offering an Adobe PDF update, that is being sent to users by criminals.

The emails say in the subject line: "Action Required: Update Your PDF Application" and contain two links that allege to do this. However, the links take people to a phishing website where they are asked to enter personal information and bank card details.

The first page, according to Garlik, prompts the victim to enter their name and email address. They are then asked to choose a product version on the second page and finally enter payment information on the third page.

"If you entered your card details upon following this link, you should contact your card issuer immediately. Your card issuer will advise you of the best course of action to take in your particular circumstances which may include the cancellation and repayment of your card.

"If you are issued with a replacement card, fraudsters will not be able to undertake fraudulent 'card-not-present' (internet shopping, telephone or mail order) activity on your account. If you are issued with a replacement card, fraudsters will not be able to undertake fraudulent 'card-not-present' (internet shopping, telephone or mail order) activity on your account."

Ticketweb is now talking to the Information Commissioner's Office about the breach.