Malicious PDF — malware analysis report

Static analysis result for SHA-256 f20d2b71ea1877c6…

MALICIOUS

PDF

87.0 KB Created: 2021-07-07 03:10:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 908b27e1d90ae2825acdc74e511325a8 SHA-1: eccf20f81e7ac0bdf0ae5178459782346f4d7310 SHA-256: f20d2b71ea1877c67bd6c530a11279deefe7b255c43c83da1c07ddbc8826ca35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm for phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0' strongly indicate malicious intent. While no scripts were explicitly extracted, the structure and URLs point towards a phishing or credential harvesting campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://philabc.ru/uplcv?utm_term=pdf+stopped+working
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/8926787312.pdf
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a24522ef85---29670024805.pdf
    • https://alixdemassy.fr/userfiles/file/20284185278.pdf
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/mrkp7nlsqgl27g91d7f1p3aj25/41611352354.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3259f806434093a0dfef0be8119c2d49/ximolexuvir.pdf
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/27814630681.pdf
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/a71a0m14hoo2sq06k5givlq5ja/juxepujiside.pdf
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608624ca9de5b---52425573557.pdf
    • http://ourgans.org/userfiles/files/lewolegikazobuzulagab.pdf
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/nngbmrpsqngrgaognrk3j48gas/40879261458.pdf
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/p1u9ernd5rbaj8sol27aldiulo/vatozodawa.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16074cfcb30b41---muvijujadaborupasej.pdf
    • http://maduraigarlandshop.com/userfiles/file/wapowosakizi.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4ad25d891---10864510818.pdf
    • https://a2designbg.com/userfiles/file/kuxowox.pdf
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f50797643---1380602191.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608edf2cd8860---35823035002.pdf
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16089247813f57---tejodimudojoxunogapofanor.pdf
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/3jcq51cjnf3mbbhdbda6febhon/lagad.pdf
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fbc2d34ceb---26360717464.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/1607da2626f09a---35127575729.pdf
    • http://aire-limpio.com/img/editor/file/57458236677.pdf
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/db002f93df20f3be0d9e3e62c0c2b4f4/zupugez.pdf
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160919736698a9---4439509700.pdf
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/1e950eba66497ab043bffc226538bd83/xudukudaselinamonomojiv.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_off0000f043.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF043 16792 bytes
font_01_sfnt_off00010855.bin
2ae027c52fdbe89b097baf252d35126fbb7574457b26b3a967d0e04704c2370f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10855 17836 bytes
font_02_sfnt_off00013693.bin
82e2f815cb2b0a706ae45d924dc28f5e1550f4e00fb6dff1193fbc2fa99f5d1c
pdf-font-stream PDF embedded font (sfnt) at offset 0x13693 10644 bytes