From your comment:
I've seen a few studies that shows forms should be in one column
This is precisely the kind of data you shouldn't be basing your actions on. Somewhere along your browsing and reading history you've picked up on vibrations that now make you think this can affect how a page ranks in a search engine, and this now manifests in writing as you having "seen a few studies". If you're going to refer to studies you should be able to actually refer to them.
From what understand about SEO, your decision - one way distracting, one way Google punishes - is a false one. So it’s not that you don’t have a valid question about forms, it’s just not a question about SEO vs UX.
One option is to have two columns of fields, but that raises the question of how many columns is best. The link that comes up when searching Google or this site is: Form Field Usability: Avoid Multi-Column Layouts - which makes some arguments for a single column, but discussion in the comments points out that it’s possible to use both effectively as long as they are designed well.
On that point: if your form fields look funny stretched across the container, then play around with the sizes of the fonts and fields until they don’t. Filling in whitespace for the sake for filling in whitespace, especially right next to a form, shouldn't be considered an option if ‘good design’ is a goal.