Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8886310532420c2…

MALICIOUS

PDF

119.3 KB Created: 2021-07-15 23:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 712425bd3269c7c7ae3a7a137f810f04 SHA-1: c37e3ee60eca7dc977258aa386d10b845c6873f3 SHA-256: b8886310532420c27fa78ebec28e9b30769a128411e7daa17051f402a792bbf2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The embedded URLs are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://musikpark-live.de/userfiles/file/75404602245.pdf
    • http://mvclassof1990.com/clients/8/8c/8ca0ba2c7a07c5cd1f21f9fc323c16c5/File/49008363193.pdf
    • http://xn--12cmi2byac9cdhd0hra6d7bxkwbgj1gch.com/user_img/files/busuxemegepopukef.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/7facffe137476731ad3e32b855541396/famidositawanolesojel.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/aaef0a254ce53f11cf3ade032488b536/55214020075.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16090913dbb295---77927061938.pdf
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a764c51443---955711688.pdf
    • http://allnatureint.com/userfiles/file/59386692377.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081832fc091c---81644599061.pdf
    • http://cheers-gifts.com/userfiles/7804424262.pdf
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1608c79f19ea08---jofud.pdf
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c43756ec70e---zarenoxibarexigowukubi.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160863b664d6ff---wusatujavesudisozotit.pdf
    • https://wecareprogram.org/images/file/53261043592.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bce4b748ef2---91755450596.pdf
    • http://sweetbasketsbyjackie.com/clients/864293/File/85352677781.pdf
    • http://vanillasky-ch.com/images/files/58250999567.pdf
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607adf0d81e6e---misizuvekoranazu.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/eab0cb6b03e913e379efaf65c7a02647/93113820922.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=all+of+the+following+are+disadvantages+to+the+franchisee+except
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016eb0.bin
1cc4d2bcf6521549beff070548b3d222e7d069d403f57c907844b921c00c61e5
pdf-font-stream PDF embedded font (sfnt) at offset 0x16EB0 11132 bytes
font_01_sfnt_off00018890.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x18890 16792 bytes
font_02_sfnt_off0001a0a2.bin
e3ce4b0c01efc917e601022d44567d3f11d3a4af58f0f098b3a1c53b0b318a48
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A0A2 18044 bytes