After checking, I confirm that there is no malware by going on the site, but Avast seems to detect highstream.tv as dangerous site since yesterday.get into Avast settings then exceptions and add the site url
The problem is that the antivirus returns an error message for URLs starting with sXXX.highstream.tv. As it's never the same URL for uploads, I end up with 50 URLs in the exception list... What a pain.