Malicious PDF — malware analysis report

Static analysis result for SHA-256 c93043c0a96d3210…

MALICIOUS

PDF

81.9 KB Created: 2021-09-03 23:43:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 21610f82a25b4d756670180c2798ac02 SHA-1: c329e6d2f6d88013a8f064b331e70288d82b6cff SHA-256: c93043c0a96d3210d93caf409ef6542c7aae0cf08cda797a2dcb145374e6aabe
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload directories and other potentially malicious sites. The embedded URLs and the nature of the heuristics strongly suggest an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://moma-restaurant.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc12286257---disumesoxitaliwilub.pdf In PDF document text
    • https://eravukappalpalli.com/userfiles/file/26438008299.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc7afe08fe---pigudokebigiwasawev.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0720af2682---57378055461.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/50af8ef9dcf9d67722cfe84ecbd176bd/xalusomerux.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/xegivef.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/39370499872.pdfIn PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/nalediditidibid.pdfIn PDF document text
    • http://garmagostaran.com/Upload/file/14247363934.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/b40a6276532f35d51abcd09aece8e967/petolegomi.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/43393458823.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/18479322733.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16071bf1cad8f8---remodosivirakopogejade.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/xifodufunagufin.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878a79b15da---62796590749.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a84ec766a---35957398556.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/51232045679.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb0340a67b---40611687185.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/gudeledanexoner.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780cb241d66---19661975708.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16076286098271---29471745795.pdfIn PDF document text
    • https://techson-cctv.com/upload/file/1538239526.pdfIn PDF document text
    • http://www.hausbaumesse.at/ckfinder/userfiles/files/23606238066.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/zefozanonadisaburidopa.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d41c0c9abc6---rarewegedijugilotuluwan.pdfIn PDF document text
    • https://electroagro.es/pub/files/sozemefilikeviloke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=generation+of+computer+chart+pdfPDF 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_off0000dcbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBF 16928 bytes
SHA-256: ebc4f8fd86b913bec31dcf4ba61311c95b1d8393310c5d35ae42e41941a20c39
font_01_sfnt_off000108b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108B1 10808 bytes
SHA-256: 72243bd54799c5769fdcd09ffdb425a82934be7c065ba2b0e72697e800cd0723
font_02_sfnt_off0001216d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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