How to share credit for an award given to my advisor?
I would just write it down exactly as it is: "I co-authored one paper in the series of four papers for which my adviser got PRIZE_NAME prize". Then I would read it aloud and wouldn't find it impressive enough, so I would abstain from putting it in the CV at all, though you are welcome to make your own judgement here.

In short: Nothing that doesn't sound good in plain, crude English will fly with people who have brains (and most hiring committee members are no fools). The very first thing I do when I evaluate a CV is to translate every sentence into plain language and cross out all buzz words. The second thing is to verify all easily verifiable statements. So, either say it plainly, clearly, and precisely, or don't say it at all.