Can you indicate here the apk codes that has the line that leads to that file? Knowing that it redirects to a google form then sends to the attacker wouldn't be enough, evidences such as screenshots or the real code will do.. The file you've indicated only is I guess a dummy file form. If they would use google, wouldn't it be that hard and difficult to link due to security measures of google?
Now I see why they only need network access permission, so that they could redirect the user's phrases input in the fake app.