Malicious PDF — malware analysis report

Static analysis result for SHA-256 06f48ed7ddfa3ce8…

MALICIOUS

PDF

83.9 KB Created: 2021-07-21 07:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 398c8694c56cacacf09a9f806efb8c1f SHA-1: b993848d477f2fe53ad774ec5265c7e5a7ded85b SHA-256: 06f48ed7ddfa3ce8b9aff63b775a27cc8c79ab8be92374616315292314752474
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the document as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://dukra.sk/editor_uploads/files/jerepone.pdf In PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780246d17b4---tubixawipotatewinit.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160714682b3cbf---vujixemepozetikusipen.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/29ef8010dd29a5a7df270c60733ac84a/28953643751.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1608f428c68229---guzed.pdfIn PDF document text
    • http://aiaato.com/FileData/ckfinder/files/20210625_53296D822A49FCBE.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6dabeda108---64266862287.pdfIn PDF document text
    • http://extracam.es/app/webroot/arxius/file/33477434194.pdfIn PDF document text
    • https://liniagdanskzydowo.pl/files/17726220760.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/d241534b205015ddbc93c81d9f8b15d4/luwukufimeforilesage.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607331980e7ab---wiliniluzoluruzofiwar.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf9f075b9b---15212531734.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/18972804292.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/7sjcgpbj7bj8h95d7uv0bnjv63/29361970618.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/bewutawikezixudiz.pdfIn PDF document text
    • http://westernstudioservice.com/admin/userfiles/file/99915213796.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/wizanifopawavima.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/479213d6ff3f863e218148cf4e2db707/53291490900.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/07/14/file/lezojuvisajugujujok.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/pe3g2t4ufi410mf38ajo7noqmb/sivuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=northstar+5+listening+and+speaking+answer+keyPDF 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_off0000df6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f781.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF781 19064 bytes
SHA-256: eeb4713d63535dfe5c061d9d6eeb12f3bf5d8ff2e7d2d3fca86f8f995eb3d660
font_02_sfnt_off00012858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12858 11076 bytes
SHA-256: a630b399532ea1cfa394eeef88aaa620cb7fb80c76c111aea4ce5b303b6121aa

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