The publisher's website has a page for Ebooks in 15 fields. None exist yet.
The site lists 50 journals. The one that spammed me names Akiko Yamasaki of Kyoto University, Japan, as Editor-in-Chief. She also edits OMICS International's Journal of Blood & Lymph, which provides the following biography: "Specially appointed associate professor, Graduate School of Medicine." The email ends " United Journal of Medicine and Health Care, United States," but the "United States" part seems, shall we say, questionable.
The only "issue" of the journal consists of separately paginated items totaling 11 pages. One author is, you guessed it, Akiko Yamasaki (listed in the paper as affiliated with Tokushima Bunri University). This issue 1 of volume 1 carries two dates, 2018 and 2019, depending on which paper one opens. (The "journal" does not seem to have a table of contents.)
The domain name unitedprimepublications.net was registered to Sri Latha, 303 Vrishabhadri, Nilayam, India (770-290-1951, firstname.lastname@example.org). That latter email address also was used to register unitedprimepublictns.com with the alias and address Unitedp Prime, Hyderabad, Andhra Pradesh, India (+91.9505649135).
From: United Journal of Medicine and Health Care [email@example.com]
Date: 31 July 7:07 AM
Subject: It's our pleasure to accept a paper from a author like you to the journal "United Journal of Medicine and Health Care"
Felicitations to you…! We’ll be indulging if you please submit a manuscript our journal “United Journal of Medicine and Health Care”. It may be of any kind full/short length article. It will be an honor to us if you submit a manuscript. Anticipating for your response.
United Journal of Medicine and Health Care