Cybercriminals have embedded a malicious iFrame into tens of thousands of Websites to fire exploits at unsuspecting PC users who surf to one of the rigged sites. The iFrame points to an intermediary exploit site which in turn loads additional exploits and malware from up to seven different malware domains, researcher Mary Landesman said. The number of hacked sites listed in Google results climbed to 56,000 at the time of writing this blog post, according to a Google search of the script tag and found it embedded on about 54,900 sites.
Source: https://threatpost.com/55000-hacked-sites-serving-malware-cocktail-082709/72242/