Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb4cdd06f370776…

MALICIOUS

PDF

72.1 KB Created: 2021-09-06 21:07:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 59fe603a9d281b320d72af33f28506d9 SHA-1: 6dbbe25c2e7d040335d8554778ec17e0dc07a982 SHA-256: 3fb4cdd06f3707767fb76fef2f36a5ebfec469936b838b0e3e8d34419d0c6213
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous URLs, several of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://norilskgu.ru/userfiles/file/fivipemogedazubiw.pdf In PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/lipodisinifesesomek.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/u79bsc080548fjogi4oa22kjmi/badupixelobebezumo.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/nulaloredokux.pdfIn PDF document text
    • http://blessedfamilycovenant.org/clients/c/cb/cb727bc273eb4203dc66fb73741ae5ae/File/44635378876.pdfIn PDF document text
    • https://cape-electronics.com/media/file/29541227015.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adb3840df4---26445064542.pdfIn PDF document text
    • http://nathulaldasptti.com/ckeditor/ckfinder/userfiles/files/pomeworepusikizewatanon.pdfIn PDF document text
    • https://bbmint.com/userfiles/file/depagozimufukukodaje.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/85914933388.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16098b3fa436b2---63069068691.pdfIn PDF document text
    • https://circolodelpistone.ch/userfiles/file/sawusarit.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/v3g6dbur1t2pmm0tojirld98fc/sitadug.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/guzazagawowadafisoxite.pdfIn PDF document text
    • http://otohondamientay.com/upload/files/83223127972.pdfIn PDF document text
    • http://musicupclose.com/clients/f/f7/f7c291dfb329fbc33054893077acf627/File/3547532166.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/sonibevosapulejat.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/67104350443.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/zupekikojiwafutusef.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161168124721a1---84546349024.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc81759923---pazuvakatubosoje.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/2c5171d3e2d0ea836e857ad2265ae01d/5198772446.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/29889265850.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160965fdcaf915---70683916040.pdfIn PDF document text
    • http://skolicka.eu/foto/images/file/wovenaluginaguxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=life+beginner+student%27s+book+pdf+free+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b7bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7BF 11080 bytes
SHA-256: b88717349573d07f66551175d65fc03e170c1f39a15f9290814a3362b26f7876
font_01_sfnt_off0000d162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD162 16196 bytes
SHA-256: 7e8e67d7d27680d3203ddf8896e026115525b7607f1900ed79863581373dc885
font_02_sfnt_off0000fa47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1