Malicious PDF — malware analysis report

Static analysis result for SHA-256 3840f2c3ea9c13dd…

MALICIOUS

PDF

100.5 KB Created: 2021-07-01 15:31:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7e10af9c63f4012f4cfbc2fe39fff146 SHA-1: c0aed771e2fdfd84d82500ed4d038b6916a88095 SHA-256: 3840f2c3ea9c13dd090d4baaf371837bd127237395d2780175db9daebb645b46
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/7cb449f23a85c931dfdc236a2ff9790b/wetepisozapexejisetiwanex.pdf In PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5dfe62c1f---xekizebataj.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/bufigovajetugidaxowowimo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1ee7cd029---42964358361.pdfIn PDF document text
    • https://t2sc.me/userfiles/bonezuzutelo.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/2d89b70981873b8e1bc02ea83914b2f3/47773277232.pdfIn PDF document text
    • http://learningkey.org/userfiles/makifenufebokorogadiga.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210616_51846DC61C504A81.pdfIn PDF document text
    • http://multi-accueil.fr/ressource/site-image/files/1026139958.pdfIn PDF document text
    • https://proektasis.gr/admin/spaw2/uploads/files/liwunizularabokewi.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/1606d514ae5dfc---detemevug.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/15d9f2a51fd3da75741c318a15cdfdba/lifakizi.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085776682ca6---85654069176.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e0bd2a9fd0b68fe5ee5bd8ae375f5659/pawanafadu.pdfIn PDF document text
    • https://indobaliart.com/sitefiles/file/xuwidovugabujitenukidigo.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1d6667673---3057871697.pdfIn PDF document text
    • http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/fe1ssvbl2jtof8qs27qb2bhtph/dulepaf.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/7fc4e51cba5199233181d4682b0a91b1/kogesipuru.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/56311209621.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/afb5fec8274a12c2977d519e805bcb53/85644439175.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/45f1ead847b75b28019f3f39701306f9/50230341210.pdfIn PDF document text
    • http://nature-revive.org/files/file/51101657343.pdfIn PDF document text
    • https://rajatotogroup3.com/contents//files/dugonop.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/910dce54c1dc18552ebe2544fd769edc/95677757278.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/mabatesufupolagula.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=the+departed+vampire+diariesPDF 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_off0001265e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1265E 17876 bytes
SHA-256: 40db8302d0cbbbd4393ace8227d9c452172b656c210f8705d770df8cc948862c
font_01_sfnt_off00015576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15576 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016d8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D8D 10416 bytes
SHA-256: d5053ab39b37ef803c469f81b2536e29d5925c6976e6a8e82130e12bb7a1ffae

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