Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d3648ee53b86a3b…

MALICIOUS

PDF

91.0 KB Created: 2021-06-29 04:59:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b4f035aded7bb493191af71412fdbb68 SHA-1: 106060408b440a0fc8f93d321df5c6d33d6b0a1e SHA-256: 3d3648ee53b86a3b9e1c17f477d6030a08333023b2763ffaa6efbb2742768dde
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many hosted on compromised WordPress sites. These links form a link farm designed to redirect users to potentially malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=chapter+8+political+geography PDF link annotation
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5c0c8b786---lapatopepitero.pdfIn PDF document text
    • https://vmwarts.com/ecovic/file/nebuvoziwazufot.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a074003fad8---49410483564.pdfIn PDF document text
    • http://talleresjpg.es/img/file/5708823182.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d7bfaa1a6---filugov.pdfIn PDF document text
    • http://kojeneckezbozi.eu/userfiles/file/vuvebitadufeduf.pdfIn PDF document text
    • https://tahubunting1.com/contents//files/maxuwilakexe.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/boxutezagutewumuvidivati.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/qg2i71dbet8a3gkce0fqdkafbq/74516192402.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/86898192523.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/q63soaa7olih40i033im58ed83/23064303390.pdfIn PDF document text
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16081b09f95ae0---nanin.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/40663817522.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16074a488ad1ef---73330978843.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/35073fdf9be4339e773e53f646786027/1771431924.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160801efd4fdc6---xamerijuzewaxeteropi.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/1ccb80b50eaddd016de8d1fd207361c4/56873075918.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8be2a5059---92270691377.pdfIn PDF document text
    • http://onnetsolution.in/userfiles/file/rikomumemidowev.pdfIn PDF document text
    • http://fmi.lu/userfiles/files/wivuzuweg.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a18e47748---wulepit.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/aoijrfa3jp5ba9hag7gv1p8d87/gomuviberokujunitolozoke.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/m8qd0bt6vjt041h2v5u0v7qqt5/tuvezupabanekaz.pdfIn PDF document text
    • http://bean2beenefamilytree.com/clients/60578/File/60422525782.pdfIn PDF document text
    • http://cesurmakina.com/userfiles/file/xigenavupe.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90894c467---nuzaxobenopomugiwifuxogu.pdfIn PDF document text
    • 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_off00010017.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10017 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001182e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182E 10736 bytes
SHA-256: 017b216899c018b12cb4cdbbd0918eab9d89ae28cbe108482abf1ada1d8455cc
font_02_sfnt_off0001310f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1310F 17364 bytes
SHA-256: 26a148590cf5832506a125216b0b694e0ea7fef3b9f1124881c1a73170871c17

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