Permalink for uploads to courses

I would like to be able to get a permalink to pdf uploads to a course/module. This makes the pdf available everywhere else on the site (other modules, posts, doc pages etc). I have temporarily solved the problem by creating a page for each pdf under Resources (which displays with the embedded pdf viewer), and using the permalink for that page elsewhere on the site. The key objective is to have a single version of the pdf, making updates and course maintenance easier.