Update October 27: This morning I contacted the owner of listed sites. The sites were indeed hacked, and the owner has since removed the malicious code from the web pages.
This is a nasty trick! There are a few Halloween sites being used to distribute malware, right at the time when unsuspecting web users might be searching for Halloween sites for fun. Patrick Jordan, aka, Webhelper has posted the details here with a screenshot of the code with iframe links to a well known malware distribution site.