What does the script do?

my initial guess was born out by the text and car/sub names:

 
$mrspy ...
Drupal Mass Exploiter
print "\t";
open(tarrget,
sub ninja($site)
sub Hakc_Drupal()
my $exploit = 
print "Cehck Password And User\n"
$brute = POST ...
[download]

... Looks like they are trying to catch Drupal systems that haven't updated the default password. Please edit your post to not contain a prettified version of the hacking script. And here's hoping that people vote reap rather than edit on the consideration