A couple of years ago I had a site that I no longer maintained or needed. I got an email from the hosting company saying it was infested by malware, and when I checked it looked similar to what has been described. I deleted the site (which I should really have done a couple of years earlier as it was well out of date) and closed the hosting account.

A couple of months or so later out of curiosity I searched Google using some of the keywords for the site and to my surprise it still appeared, although clicking on the link gave a 404 error message. Obviously Google don't rush to change some things.