@bismuthbullion. So, wait… it was working and now it is not? Did you make changes to your .htaccess file?
The reason I ask this is because if I copy the link location “http://clonbeacshs.eq.edu.au/Forms/excursion/Canberra_Trip_2012.pdf” into the browser directly it redirects to your home page. So, the issue has nothing to do with the module. I think it may be an issue with your .htaccess file that is restricting access to this file location and thus redirecting to the home page. Of course, this is just a hunch on my part. I could be a permissions issue, but typically with permissions issue you would get a “Access Denied” or “HTTP 403 Error” instead of a redirect.