Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8cf412fec7b9c9…

MALICIOUS

PDF

77.3 KB Created: 2021-06-25 21:12:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1620d290a66c4501e0aaab4905e87a11 SHA-1: 26c51d32422784811a8d7df42d9a1b198551ff81 SHA-256: 7f8cf412fec7b9c9f165ff06d8f89c2496d4104f5b266678b8c08c1ce1802f3b
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of external URIs and link farm heuristics further supports a phishing or malware distribution attack pattern. No scripts were extracted, but the overall structure suggests an attempt to leverage compromised infrastructure for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 https://infrive.ru/uplcv?utm_term=adding+two+vectors+graphically
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1609a3918f36d8---18166998406.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bf213c69ea5---6990634613.pdf
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/5e7f943f260ff35c043bdf5f8fdec056/xusivajodipewuridumifopo.pdf
    • https://thietbidienmanhcuong.com/upload/files/53895700610.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac0442d329d---88907579314.pdf
    • http://mu-rrrc.com/userfiles/file/53336164894.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/884b5a279f72e93c031a50af63d5dcc1/16737925760.pdf
    • https://bdata.vn/upload/files/73685400164.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/c8aa3ae63141e7bf6540007863db107a/44210106535.pdf
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/5ung9p58emkoqgoi0tj8igusv4/47175368003.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf20628ed8f---lovojezigutagafowoxit.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16090be1bede84---xoranimiwiva.pdf
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16088e08407f01---lubelazizenojisol.pdf
    • http://funagamex.vn/PhuongNamGroup/userfiles/files/99794798504.pdf
    • http://gayaarchi.com/userfiles/file/20210621233634.pdf
    • https://snqrsl.quebec/upload/editor/file/rorakogulibuvapifibuz.pdf
    • http://slstudio.it/userfiles/files/nujosofonevefuv.pdf
    • http://18554080.com/userfiles/file/livibenisaduwalufug.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/sb4lur487af5tbbd26bq1a4js7/komepofifuzozovonezazeru.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160b45e3fe737f---xunepivefupiz.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/418115cfbae8702018a5cfc614e2ce3d/vibipekadaj.pdf
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b315e8267c6---64797743801.pdf
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/4j7sqkg5gn7flafm4uttstalae/vodep.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2a52e10ff540cc0b4f38560d2f34a857/84328148396.pdf
    • http://kingcraftviet.com/uploads/ckfinder/files/64068041130.pdf
    • 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_off0000caa4.bin
83e5462c972b32d1c64c48c8ab0a8b0e48f028ca7333f5a126242d7347458874		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA4 16800 bytes
font_01_sfnt_off0000f64b.bin
8d07d529f0fe75c5ccdc5a5bae848d65c977cbe9b17f87dbb6b0dbcb0e7b96aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF64B 11040 bytes
font_02_sfnt_off00010fd0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD0 16792 bytes

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