Malicious PDF — malware analysis report

Static analysis result for SHA-256 a851feadcd2e35a6…

MALICIOUS

PDF

83.4 KB Created: 2021-09-02 07:21:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c86568e645c28b5c5726fd66d82b52ab SHA-1: 3643854423a92a0eab745224ed92d402654cc227 SHA-256: a851feadcd2e35a6f0f5bfe5fde4ca84bff8e719327269141ddbfeacfb7ae421
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS upload storage or disposable hosting, 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. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609b1210bc313---96812901239.pdf In PDF document text
    • http://madiran-cruduparadis.fr/ckfinder/userfiles/files/situzigudo.pdfIn PDF document text
    • http://zap-interactive.com/uploads/files/xonoziza.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e252c2ccdf---tepezoke.pdfIn PDF document text
    • https://snabavto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be5b938e4a4---zuxegupevusetixipadinopi.pdfIn PDF document text
    • http://csc0532.com/userfiles/file/20210610090018_yvmp1b.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/6834542063.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083344f7a01c---tabitalopawowisakow.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/87389307968.pdfIn PDF document text
    • http://anbao.vn/uploads/userfiles/file/febekuba.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/wodimeneruxizowu.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/sevewisokomoru.pdfIn PDF document text
    • https://stmarys-perthamboy.com/upload/File/19879967281.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/xobisukiporabezaxenogu.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/rusilomax.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/1960f45e87c0c73317e4ab9cfc9421bf/34304139370.pdfIn PDF document text
    • http://brno-skoleniridicu.cz/ckfinder/userfiles/files/balojosanimanidexoxisoda.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/e2b2b281edfa53a448cc954724c0e0ff/jixapuxuwonarezejuxobexi.pdfIn PDF document text
    • http://www.hgbehringer.de/img/files/files/wofapi.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/vofexa.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607531d56fd41---rekojatowur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=the+breadwinner+study+guide+answersPDF 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_off0000e0ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0FF 10764 bytes
SHA-256: 25a8de4f95b8f45e658ef4bb95c1a3b5c88b2265cc74a007010426b21413a41e
font_01_sfnt_off0000f994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF994 17724 bytes
SHA-256: 24b6ddb3cd20f59dd85dd494e61a5dc714c79ef18854d1a5cc8bffe6b310f808
font_02_sfnt_off00012723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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