Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7da3f46b2ab47fa…

MALICIOUS

PDF

139.4 KB Created: 2021-09-07 23:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 00f46f154c5f01db448cc82140136627 SHA-1: ea22c060c9bd4d1735296d276127b3e5e2921fa4 SHA-256: e7da3f46b2ab47fa87382172489c1292a13e336f2a2fe522b13a839762d87224
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. The document body is heavily obfuscated, preventing analysis of its direct content, but the heuristic firings strongly indicate a phishing or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/0ef5dd74bd0cc446990f827307c3d603/20604370025.pdf In PDF document text
    • http://turnwealthy.com/ckfinder/userfiles/files/jodupabixusolepepomokiz.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/nnk1au40b3a4fp0253jdqlk0c2/suguwipevemag.pdfIn PDF document text
    • http://rayanchem.com/d/files/47496777824.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/af8a74ac0fd8e7a7a77247872bb808ba/88939403610.pdfIn PDF document text
    • http://malifer.hu/upload/file/kilage.pdfIn PDF document text
    • http://fittbike.hu/files/file/95366978352.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-6///2021615233039591.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/b8840ef9f5224c9b1ea55d3d3f41e5c5/zelipinumokododu.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16134ab94265d7---ziwobaxa.pdfIn PDF document text
    • http://dentherapia.hu/files/file/7565416031.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/87222778473.pdfIn PDF document text
    • http://elverum-revmatiker.no/images/file/jumizabivakuj.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/3facc8e920cf490fb0cfca9088c965a7/xebijugixuporo.pdfIn PDF document text
    • http://learningkey.org/userfiles/61053540772.pdfIn PDF document text
    • http://emons-verlag.net/testarea/cwsCMSlight/media/files/48786063423.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec7355172---44236597154.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/dedopivarefinegazazomurev.pdfIn PDF document text
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/5268450735.pdfIn PDF document text
    • http://market-oborudovanie.ru/upload/file/pejevakikijufu.pdfIn PDF document text
    • http://uppercanadatwocylinderclub.com/clients/877835/File/5342932755.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=text+linguistics+and+discourse+analysis+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_off0001b8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8C3 11076 bytes
SHA-256: 39d71840a93497b311f08fe3f870701e3b8c31ef2842b59faf749f20c2fc8dc7
font_01_sfnt_off0001d28d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D28D 20344 bytes
SHA-256: 30dc0889397ace9baaaa41b9353e4bdaad472bdd403f20bb67808f99e25f758b
font_02_sfnt_off000207b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x207B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1