Yes, this does look like a symptom of a memory leak.

I am certainly no expert on the modules that you are using. When looking at your code, I looked for obvious memory allocations with a loop. I see:

$req = HTTP::Request->new(GET => $qurl);
$req->header(Accept => "text/html,application/xhtml+xml,application/xm
+l;q=0.9,*/*;q=0.8",
             Accept_Language => "en-US,en;q=0.5",
             Connection => "keep-alive"
             );
[download]

I'm not sure why a new object needs to be created here instead of re-using the same object with a new uri? If some param like maybe "keep-alive" causes the object to remain in use, then I suppose this could cause a memory leak?

Anyway, just a thought about something that looks suspicious to me.