B737NG Captain reported two flight attendants were slightly injured in a probable wake turbulence incident while descending into EWR.

Narrative

Descending into EWR on PHLBO arrival. At approximately DYLIN we encountered a slightly rolling; moderate turbulence that felt like wake. The jolt of turbulence immediately subsided and I called to ensure that flight attendants were seated. The response I got was roughly 'not quite'; so I got on the PA and advised 'Flight Attendants; take your jumpseats.' A few moments later we received a call from the cabin that 2 flight attendants in the rear were hurt. We advised ATC of the moderate turbulence. The turbulence came on again and for the most part was bumpy until landing. We contacted the flight attendants once more and were advised that the two flight attendants had fallen during the encounter. One had hurt their arm and hand and the other their back but they were fine otherwise. We landed uneventfully and I observed and spoke with the flight attendants afterwards. They said they were in a bit of pain but could perform their duties and retrieved their suitcases from the overhead. They advised me that they were fine but were going to go to the clinic as a precaution.