Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c3a636df50e562d…

MALICIOUS

PDF

91.2 KB Created: 2021-06-29 03:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: c54ae91582b33f754a5da09e92358281 SHA-1: 850731a8219aa7b85edc0339dd8423a10edd12ff SHA-256: 6c3a636df50e562dffcd9415e3f5a744534f20f0bf377f0242339dbad0de28dc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL analysis strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://alarcon-v.com/editor_upload_image/file/kuzivisujuxasubaxipi.pdf In PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/bq8fcgh8vf17iubflcb3it0033/matonimajowi.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/sisop.pdfIn PDF document text
    • http://slsnn.ru/content/files/xibuwigubofituzonapisijos.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c3ff1a583---puxutekifavojoxineki.pdfIn PDF document text
    • https://popa.com.br/wp-content/plugins/super-forms/uploads/php/files/3249d16cf5c4f322a045fe714a6c4e20/putonumogewuweduda.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/19629886363.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075b6e52dedf---xadetixuvozutovitowotu.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/12a08f2faa571234843e280827153b67/xarugusarogilapazabedil.pdfIn PDF document text
    • http://www.cheapmotorcycleinsurancepa.com/wp-content/plugins/super-forms/uploads/php/files/mjd07shafu38qr6sjhq01b5d71/42010925217.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/luxemurimegojonapegamu.pdfIn PDF document text
    • https://pametnidom.hr/pametne_kuce/userfiles/file/numiwowudewexezo.pdfIn PDF document text
    • https://suma.ca/upload/editor/file/relerobasavemuzafagopuzi.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/8edb1b565de3d33200dd43b79bab4c1c/32071423955.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/60763466054.pdfIn PDF document text
    • https://eyescare.vn/app/webroot/upload/ckfinder/files/299669030.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ba3f8fd14---32181485739.pdfIn PDF document text
    • http://vendingchat.ru/uploads/ckfinder/files/rasejamun.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/bexasabemipig.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/pikunapijusanidubugomo.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/12003727358.pdfIn PDF document text
    • https://digireg.se/upload/jovozoxe.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/geroriwipebijorupekiga.pdfIn PDF document text
    • https://ilcaminodaugo.it/file/tijegemutotupasizuxori.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=angle+in+a+segment+of+a+circlePDF 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_off0000f9f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F8 19552 bytes
SHA-256: bb7c4724cc0b27f969d74976dfffa5d65e68300ceaad2bd22c02d593d1088823
font_01_sfnt_off00012f0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014722.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14722 10660 bytes
SHA-256: 927cc3ba465e2897e1676038ede011cfc59777d48f24bbbbc3da12dfc7d07587