I want use magento2 default contact form in my static block

Call your contact form block with template file in the cms pages.

Try below code :

{{block class="Magento\Contact\Block\ContactForm" name="contactForm" template="Magento_Contact::form.phtml"}}

There are two mistakes:

1) use Magento\Contact\Block\ContactForm instead of Magento\Framework\View\Element\Template.

2) Define your module in template Magento_Contact::form.phtml.

{{block class="Magento\Contact\Block\ContactForm" name="contactForm" template="Magento_Contact::form.phtml"}}