The description for Wild Shape declares that the transformation is magical:
Starting at 2nd Level, you can use your action to magically assume the shape of a beast that you have seen before.
Additionally, the Sage Advice Compendium states:
Determining whether a game feature is magical is straightforward. Ask yourself these questions about the feature:
- Is it a magic item?
- Is it a spell? Or does it let you create the effects of a spell that’s mentioned in its description?
- Is it a spell attack?
- Is it fueled by the use of spell slots?
- Does its description say it’s magical?
If your answer to any of those questions is yes, the feature is magical.
For the purposes of overcoming resistances to non-magical damage, are the natural weapon attacks of a Wild Shape form considered to be magical?
I understand this question is similar to this question about conjured animals but as the druid is magically transformed by this class feature the answers may differ.