Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d79b75e27fb3b3f…

MALICIOUS

PDF

65.6 KB Created: 2021-05-04 17:19:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ddb2ebec2bd172aa5a8f40ea62f152ad SHA-1: 0c9ec81f1a62fecb2ff0b5b83144b259350bee4b SHA-256: 7d79b75e27fb3b3f97988ae265b860f98f29226e4127a05e42eb2dc56755bb3e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised CMS upload storage, suggesting it's part of a link farm designed to distribute further malware or phishing content. The document body, though heavily obfuscated, contains metadata related to PDF generation and a search term for downloading a magazine, which likely serves as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • 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
  • 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://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/753a8f35a9d54b24673419026dede8ad/nesesikapizonotanuxumu.pdf
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870453335f9---57023217320.pdf
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0dbdda39d---86256770848.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/r5iuf61mrrakkvj0i8fh0kvn1d/pepudaxukasuwomikebo.pdf
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608cbee5e4b2e---xelod.pdf
    • https://eyetracking.pl/userfiles/file/dekesonejoxapiw.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/641a802893394e796e1b1031212a21a3/92930849923.pdf
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084fb26432ca---latukaxowunurirola.pdf
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/b5rlh963j099gscm3bok46i616/sewapobawu.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607794b0a104d---18649192665.pdf
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f37cf01ed---54395323209.pdf
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/16075cc159e161---zuwilazusipibetenob.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607faebf70778---58854201204.pdf
    • http://altaprecision.com/userfiles/file/35232396938.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16084cdcef036c---goniwigalugif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=descargar+revista+arqueologia+mexicana+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1a0.bin
a88c461a03b0fd32fe9938894f1737132d33febc25ca99119c824c90a4dde19e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1A0 5728 bytes
font_01_sfnt_off0000e519.bin
4a7216e52ef8b4eceef994f4db2113080312f897c5692c2cfbaf0adfee01822b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE519 11952 bytes

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