Does it matter if each student sees the URL's and PDF attachments for other students? If not, then start your quiz with a description type question with everyone's URL's and PDF attachments listed there, with instructions telling the students to make sure they us ONLY THEIR information.
You could do the same thing with a text only Assignment activity or with the Journal activity by placing everyone's URL's and PDF attachments into the activity description.
One other possibility would be to use the Dialog activity. Start a dialog with each individual student....but Dialog is not graded.
That is a good idea. It really does not matter if they can see other students' links.