Malicious PDF — malware analysis report

Static analysis result for SHA-256 acb3c82cefcb4038…

MALICIOUS

PDF

79.5 KB Created: 2021-07-01 19:14:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4da6b90094efcc8148e4791abfb85289 SHA-1: 0a138b33d51f36ef378dde2eaf26242e4ef4796d SHA-256: acb3c82cefcb4038efa63547d02b9c4230e7719207ae6b30f41c43ac433979b3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many hosted on compromised WordPress sites or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure point towards an attempt to lure users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://philabc.ru/uplcv?utm_term=how+to+find+the+domain+from+a+graph
    • https://medius.sk/userfiles/file/bubowofigobu.pdf
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/26bab4481d208125e5d6c2ac28f0f0e4/87860256427.pdf
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72e14baa12---16407487767.pdf
    • http://zulassung4you.de/bilder/file/18703711809.pdf
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/c084c2a4533a430c8bdf10c48da1f9c2/kejaxobo.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc6f4d4ce16---lukufizenogikajojezijun.pdf
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/9887c9b10a444702b8a390cff9d33d05/49128478533.pdf
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/8d7e7c400cbc0b9f753e472a12cb5479/85216434821.pdf
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/05235acdeb04d889dfbe0d14f0faf7a8/kufefodigasubufoxokoliral.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607b278950814---jiwabal.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/81b3e83c9bbe7c443e547a5cb56096f7/91427632567.pdf
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/16078d73b55055---70659981252.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/fbb7762bfa0bc9989cad70c7d0c3ec00/guwerupewek.pdf
    • https://atcotourismtravel.com/userfiles/file/gifolaminobab.pdf
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/17859968319.pdf
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/1c1b62e4c0a5e50176abffdbd8e4f232/luribaxagixitetise.pdf
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b5791754da1---mibezuf.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/0e1b496fe7d34c9d27f4a299e603d2da/derebebuxe.pdf
    • http://goergenpainting.com/clients/0/0d/0d1038892961fdbf96b6a8e7e8daca8f/File/6950938836.pdf
    • https://www.foundationofhope.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f95af06e45---87598203261.pdf
    • https://webtechnocrats.com/upload/file/mukajibomugakumir.pdf
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1608522edd1851---nilonokitorewexajit.pdf
    • https://aduanaldelvalle.com/userfiles/file/zugapivofewakexovefuju.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16098eca2cdcb5---goruzuvivivan.pdf
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/2f3133e50d63d64d7b892f8f341e5ac0/rogutigilepe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d476.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD476 16792 bytes
font_01_sfnt_off0000ec8d.bin
03fa8ef8c53286f957ad5445ca7939d776a9f74f7bf240bc47773224fd32302c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8D 10808 bytes
font_02_sfnt_off00010502.bin
efe63a9c31e49dd9c3a61844d0a78ec538a1b3d8d6db4f9dbb0f3576fd3e7bab
pdf-font-stream PDF embedded font (sfnt) at offset 0x10502 16644 bytes