Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c671de95521004e…

MALICIOUS

PDF

80.8 KB Created: 2021-07-14 00:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5c1a7aec632d1831c1e21dd2a93442ee SHA-1: 85c6d1b31e53a2ad5dc02e6eb5473744f600584a SHA-256: 3c671de95521004e49b8d1cbf38aebc37d45e9a7ef7353ad2a419a29e2904aff
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised WordPress sites, suggesting a phishing or malware distribution scheme. The document body is heavily obfuscated and unreadable, providing no direct content clues, but the overall structure and URL patterns are indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608b956ca6c29---tudugu.pdf
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/c1d26ac24cc76e43642cc5846f494bbc/dopimazitomefozajitepilof.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d46abae77---5078674004.pdf
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796c4694f6a---rikirirowufefebebazabem.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072903062955---66548040639.pdf
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbaeb2bcb2---69301025500.pdf
    • https://mamadona.ru/ckfinder/userfiles/files/kumixesezorevalexulo.pdf
    • http://argyleliquidations.com/userfiles/files/xejunalitarosakofupa.pdf
    • https://tsegypt.com/file/7743598732.pdf
    • http://lookkorea.net/userfiles/file/linufo.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/k7qsp56h6b608gp7aovojm7hb3/bebivoke.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4494d031a---10629007327.pdf
    • http://facilitymanagementassociates.com/survey/userfiles/files/difamasenazijageme.pdf
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/e18dc03e773bc7cdac4825bd20c92183/sifevobanenorodi.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608ffce13f6e3---kabuno.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/61kasbr9i4m6daeovdngrddno6/xelum.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/9fdc4dc82815caefce52379e3c51505b/turisupalexozivuti.pdf
    • http://esipro.fr/userfiles/file/55869370761.pdf
    • https://seataclightingalaska.com/wp-content/plugins/super-forms/uploads/php/files/2e3062908a06db0814b25b479ccf9e13/69477518510.pdf
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/14381941684.pdf
    • https://walkandsmile.com/userfiles/file/dolozesonadizufow.pdf
    • https://medtek.vn/storage/file/93619183275.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b80afa32e09---44757232681.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/esj6brg5eeh2995jh829lou9m1/tolewit.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/9384947079.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=convert+solidworks+to+3d+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_off0000d7ce.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CE 16792 bytes
font_01_sfnt_off0000efe0.bin
607665895a8bf06993881b2367e0dee8f72059695d0d869671867e32a98bb9f7
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFE0 17252 bytes
font_02_sfnt_off00011c81.bin
689f8abfd0f002bf4fbf36df3fcfadf7726e7aef3f1d3ffc559ada6044d21e00
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C81 10776 bytes