Lately, the unregistered (available) domain heiiehdsx.com has been showing up in my HTTP referrer logs. It comes from a variety of IP addresses (none very similar). When I Google the domain, the only results are reports of it appearing in other server logs as well.
Anyone have any idea what's going on here?
Looks like a spoofed header.
Most HTTP headers can be very easily spoofed.
FireFox even has an add-in for modifying headers.
Chances these are from a bot/spammer that is looking for vulnerable targets.