The exact same thing happened with my site. Over ten years ago I had a parody auction for a 'Dracula X Special Version HuCard'. I created the auction and immediately ended it to use the html from it as a dummy page. It occasionally comes up over the years and I uploaded the old html file to my webspace to show people at one point. When my site was taken down my host never told me why and when I finally got them to say that it was for phishing, it still took a long time for them to narrow it down to a single file on my webspace. They insisted that I remove the file myself and it only took a minute, but the whole thing took weeks to resolve.
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