Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6966710fb40583e…

MALICIOUS

PDF

87.9 KB Created: 2021-07-08 18:56:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f27af56d8743525c6af6651e0a443db1 SHA-1: 3e3e54867ce13bdd2f8a5de422a04162d89931a8 SHA-256: c6966710fb40583ebc24df14d07bbb9b7a59de3d32a1a40808aaea89b7864d3d
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/rspm6pi70pcf2q1ugkbpmvf6f0/70837575997.pdf In PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/dm2q21hji9akkg8gc35kt1dfu5/82753324510.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/fc46ce815f6c4c4bc9f6984db7917fca/xikika.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/wesetodudosagoxezaxopadav.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/89314381577.pdfIn PDF document text
    • https://vietnamairlinescorp.org/js/ckfinder/userfiles/files/96893009055.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/45227625773.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/1368076690.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/47826824483.pdfIn PDF document text
    • https://ecomassage.pt/wp-content/plugins/super-forms/uploads/php/files/h0c69hoocjthls0q441vbupb33/4413476004.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/biroxigopowop.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/6852titfkb0peqaourl8uovhn7/welovil.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a68be597590---vurevugap.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/8ijal9aenceu6l9v02n48tt108/dijakorufogori.pdfIn PDF document text
    • http://pozitron-s.ru/userfiles/file/ximafetidagevu.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/9dbde4140472a9da67645b2ae445d0e6/govem.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5110181c27---jurowiz.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/rakasep.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1d4d987f9f---fijarawafijemeguminavomop.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/2b0dc8c172c7676716e779874da44639/fezarevalukuwomogem.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/motemenibi.pdfIn PDF document text
    • https://amiablediamonds.com/wp-content/plugins/super-forms/uploads/php/files/ebe169bc7b80b383e5e31bdafd80dd80/84480633039.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8071e3720f7dfb94ebdf69838c713770/62010862444.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/85494076735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=present+perfect+past+simple+practicePDF 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_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E7E 10520 bytes
SHA-256: e5a5a1299f1ecefc2ed5071a4abb09f4a58a5fa280f98f2215d94c764ec437fa
font_02_sfnt_off00012668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12668 16780 bytes
SHA-256: 98d3c198f3ddae5988826c3baa31874a5e7475a63cc4fc9a6233e2bc417160f2

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