chrome malware detection

I am getting a Chrome warning at a  cmsb login page:

"Content from rebelforever.nazwa.pl, a known malware distributor, has been inserted into this web page. Visiting this page now is very likely to infect your computer with malware. Malware is malicious software that causes things like identity theft, financial loss, and permanent file deletion."

This isn't happening on other installations or even other pages on this same website, only the CMSB log-in page. My host did a malware scan on the entire site but it came up clean.

Any idea what could be going on?