Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9d9a6513cf93043…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 12:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c536bb201924c688bd91ad54555f1dd2 SHA-1: fd512e1e4e2be0916fdbd3b784994afcbb737ead SHA-256: a9d9a6513cf930430a628f378bb5436d89ccf6c43daa78083d96e2245997965d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as 'Pdf.Phishing.Trojan' and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage, suggesting it's designed to redirect users to malicious or phishing content. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a68cefa77d1---8552599797.pdf
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ebe244e50e---juduxomokerolubekilefufi.pdf
    • https://primewestelectrical.com/wp-content/plugins/super-forms/uploads/php/files/86a694e5cf91b3eeb62fef1c1c1090fb/damowibevijeganisirarazij.pdf
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a22fced94c7---43473046089.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/o4h50ursm1tnfrvignq0i8u9g6/650357517.pdf
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c888f312a9---91000168432.pdf
    • http://zxsolar.com/d/files/72560203024.pdf
    • https://terminal.hr/userfiles/file/17192386319.pdf
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9f31330c2---karodizufituzilepafunes.pdf
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/66pvec0cf81mlpur3knmpcj2n2/xifuwetikugadujopipezuma.pdf
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d14afe5a35.pdf
    • https://szabobuszberles.hu/files/files/fepekibakabilaloguvusedi.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609a63f654932---85122829822.pdf
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/739e526ce033bda65bdcaf1df8220e4f/32847146260.pdf
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e3c26c8c9---17169909629.pdf
    • http://capri.lt/userfiles/files/subudosuler.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/62bec783054b25ff7dc74f2cf75004bf/41704808377.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/875eafc6c1fdf83e0d8769970b2ac850/mipabesomoxuzaso.pdf
    • http://opakowania-loga.pl/zdjecia/fotki/file/93238838067.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607c62dfe4846---10711207453.pdf
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e35f3f859e44c8de386877d4e4d7f8e1/sowepowiwokirof.pdf
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083173e129ae---tirexerixapelolanepovubix.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/lh2orlb21pu9elqffld3j9fju2/zupolejo.pdf
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/de202a2d562a526a3311a87a5391ccb9/dexax.pdf
    • http://vankouwenenmastop.nl/UserFiles/file/25838999633.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abc94dc4d75---zawigirukek.pdf
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdaf1a47ff4---98410174779.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=all+types+of+conflict
    • 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_off0000ede1.bin
d173f349c18343d867445c099a3bb6e2d378fb85f56574bf416aaca032c61318		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE1 16260 bytes
font_01_sfnt_off000117f6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 16792 bytes
font_02_sfnt_off0001300d.bin
b54a75ac8737b6456908a5d47ac62033e5ad633c1b8bdc4d72f4b71ec53450aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1300D 10308 bytes

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