Thanks for the reply, runtoword!
That might work in theory, but the problem is that some links are simply too long and are automatically “cut off” and continued on a new line, which then breaks the link.
Also, when I try and short them to display only parts of it, the link doesn’t work anymore.
What puzzles me, is that this is a problem known in PDF conversion, but the PDF itself works. It is only when it the PDF is uploaded (or downloaded – not sure when the issue happens) that the links don’t work anymore.