Malicious PDF — malware analysis report

Static analysis result for SHA-256 f710be8ea7b0d6e3…

MALICIOUS

PDF

120.3 KB Created: 2021-07-06 15:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9656210baf2a889273155e4900bf0e89 SHA-1: 65f6f9247e19c46b917532b7b59a3906897aebae SHA-256: f710be8ea7b0d6e3579183c46e2439f0e89cecddc9e701077496da74b7156d5b
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs pointing to compromised WordPress upload directories and other disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple compromised CMS upload links suggests an attempt to host malicious files on seemingly legitimate but compromised infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9858

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 https://nomylo.ru/uplcv?utm_term=ancient+lumber+ffxiv
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba4ca2459c---lademebamukasubepe.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/14k7brgn4qnc0ifq5erel0p2d0/42608730893.pdf
    • http://firewheels.pe/userfiles/file/23968219429.pdf
    • http://hyperasp.net/userfiles/file/31308512102.pdf
    • http://orbitsecurity.qa/pro_mvp_tech/uploads/file/jagodaj.pdf
    • https://robotics-institute.com/wp-content/plugins/super-forms/uploads/php/files/6l26m1r60gq0j54hn0gbstr59f/kumatupebuniladotije.pdf
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/faf89e9202ec97d25ee9e6ade4f2e11c/titurowukerufaserifuvelop.pdf
    • http://absolutelyneon.com/userfiles/file/36048580654.pdf
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/848775fa0b551a2c6c93cd114e853ffc/94960163193.pdf
    • https://www.adilaltinsoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074c3eb01c32---viligafogar.pdf
    • http://dent-pro.cz/pic/file/61537865584.pdf
    • https://londonvipchauffeur.co.uk/wp-content/plugins/super-forms/uploads/php/files/79c07f00b5c47884053acd7ac0b4db1a/tefujuligisomubi.pdf
    • http://ivepe-elearning.gr/assets/UserFiles/mainHome/file/17929389687.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606d35789849b---92579780160.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16082117e9b4b5---42776599397.pdf
    • http://urbanconstructions.org/images/uploadedimages/file/nidafaduzakomovovenun.pdf
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/tedalefekiro.pdf
    • https://yuss.it/file/73619032393.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/b0447c51a01d268fb5827d0adcebe5dc/lotuvum.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/ba63413907a58b09c925f81e26438fe9/36277627876.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c62cc9c0768---gowaxaxuxowoza.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070a473ce24b---90557780601.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16085b981ce0d7---8060663924.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d231204fbc5---jasajo.pdf
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16084449130488---bibakewexudupisekex.pdf
    • https://ludifrance.fr/userfiles/file/simedilazavuma.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_off000173ff.bin
a9732a57247999cadc1d64659049c2a33ef528ddf70bbc171a7426bd9bb846f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x173FF 18128 bytes
font_01_sfnt_off0001a2ec.bin
8c2c73bb04d8a20786c267451f41d3c98989a124100f7cc195bebef1946ae820		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2EC 10436 bytes
font_02_sfnt_off0001ba97.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BA97 16792 bytes

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