It might be a FP. Not sure why urlQuery says "Suspicous" though...
The Suspicious, if you checked out the URLQuery link is Reputation based, which would seem a bit strange for either blogspot or HpHosts sub-domain, though you get all sorts of dross using blockspot.com for their blog.
That said there is a compressed script file being loaded when you open that hphosts.blogspot.com/ page, as indicated by the |>{gzip} at the end of the alert URL and it is this that avast doesn't like, see image extract of the file contents.
Having said that subsequent visits I don't get the alert (after the web shield aborted the connection, for the gzip element)
