Malicious PDF — malware analysis report

Static analysis result for SHA-256 c539cebea14a5f06…

MALICIOUS

PDF

85.9 KB Created: 2021-06-26 06:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3a5855f98769e4b3c159819c3b89e1a1 SHA-1: 77be63dd370f8544df21bbc82354e334cd99e69d SHA-256: c539cebea14a5f06e82068c07e49d52118561ff96bbbbccb5c31a0eeaecafd0d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to numerous compromised WordPress upload directories and disposable hosting sites. These links likely serve as lures to phishing pages or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://planbmedia.hu/files/35997846043.pdf
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/bef388f6fbdb6d3ef53216db5ee0e4ca/96879237903.pdf
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609434f329cf6---laxisidilopetubezalulowok.pdf
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160954627c9caa---vifaluma.pdf
    • https://glowskincare.net/wp-content/plugins/super-forms/uploads/php/files/71f1470acd56574cef8e30347d458cdb/nufofadu.pdf
    • http://sbnjl.com/userfiles/files/ropaposasudebokinosuwu.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b1ea3f021cd---37033432618.pdf
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16081d35931d1a---67802856576.pdf
    • http://pospatrans.cz/UserFiles/File/58214689854.pdf
    • https://masihpt1.com/contents//files/5596913631.pdf
    • http://alexlunacoach.com/img/editor/file/tezago.pdf
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/1608897a79aeb8---rikedu.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4916bf767---sibipeg.pdf
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd975747d3---93317738808.pdf
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/27db11263dd55c39c16508279b445088/99882358475.pdf
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/13a466eae0106f04ee585335badba925/84309734421.pdf
    • https://bisnismedsos.com/userfiles/file/59823718329.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b1db0b70554---wenetifesa.pdf
    • https://annjulieskarpmo.com/userfiles/file/59402409.pdf
    • https://guclupin.com/calisma2/files/uploads/pusenuxisubosase.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090db4d81d7a---82129742486.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/068f0a67e79dc2fb4669dd2bb160d5a5/61677279052.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/sjf290h4dfdeitunnv3bhkbl0m/dekokatakonovamam.pdf
    • http://atut-biuro.com/uploaded/file/60334989585.pdf
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/3260b9d91fd11798985c0c90d53e703a/90794238217.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a4133af14f9---82629273397.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/17097fe49f5bf32cdd50be845bad485a/pezedixugifanufas.pdf
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/20888167843.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=x+ray+spectra+of+elements
    • 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_off0000ee1d.bin
afc217de3ec58d52ae8719a83c68e3034017ec78852d7d5d9ce41a4dc9a03455		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1D 10672 bytes
font_01_sfnt_off00010695.bin
c2a6a849c7de99908426efe6d999875c38509e4d19aafe83b5424fcf753fcf0e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 17000 bytes
font_02_sfnt_off0001322e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1322E 16792 bytes

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