Unfortunately, there is no way to tell with such low quality images, you would need to be hands on with the device.
Looking at the accessories would not really help as those could be cheap replacements that are fake with a real iPhone.
You need to have a look at the device hands on and download some apps on the App Store and try logging into FaceTime and calling another Apple device.
In case you are considering purchasing this, please make sure the device is not logged into iCloud Find My iPhone, otherwise this could indicate the device is stolen, and in future you won't be able to use the device if you erase it and try to set it up again from scratch.
EDIT: Regarding the actual power adapter it self, this is a European iPhone power adapter but it does look significantly different from what is on Apple's website: https://www.apple.com/support/usbadapter-european/