To which traditional class does خَافَ يَخَافُ belong?

Complete Conjugation of Khāfa–Yakhāfu: Hollow Wāw from the Samiʿa Class

• Naṣara–yanṣuru
• Ḍaraba–yaḍribu
• Samiʿa–yasmaʿu
• Karuma–yakrumu