Spamming one post with bad links, does this harm the main site?

Hi guys.
Lets say I have an authority website and it ranks #1 for a 5k keyword.
And I use only high quality manual backlinks with 3 tiers.
And this site has 100 posts.
And I want one of the posts to make rank for a keyword that has 150 monthly searches.
And I start using GSA or any service to create links to this specific post.
But unfortunately these links were spam and it hurts this post sadly and its rank dropped strongly and may be it de-indexed also.
My main question, will this trouble harm my main site ranking?

Not always but it may. You can later delete that post so it shows 404 and you should be free from penalties which were caused by that post .

kazhkaz said:

Not always but it may. You can later delete that post so it shows 404 and you should be free from penalties which were caused by that post .

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And how can I know which post is harming the site or getting my main site penalized (or having a bad links which could harm the site or post)?

Any Suggestions ?

You can use Google analytics. You can use Google Disvow tool to inform Google that the spam links from other websites are not created by you.