Or people looking to lure job applicants into a scam. The job being on the companies actual LinkedIn page adds all the credibility they need to lure people in.

Especially when many companies run their job application pages through 3rd parties. The phishing page having a different domain isn't suspicious at all. Most of the time when I check the career's page on a company's website, it links to something like "corpname.randomhrsolutions.com".