Malicious PDF — malware analysis report

Static analysis result for SHA-256 14641296b2f51cfb…

MALICIOUS

PDF

85.9 KB Created: 2021-09-01 21:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: a12cc478a66a3885c8e6f1cfb9dd2ed1 SHA-1: 760e7431efa5e4ab32f0059bda1cd94c9b3be454 SHA-256: 14641296b2f51cfbfbbf88a8e8a4a75b21f04c02b96359526c3da5bf16e3f59b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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.
  • 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://llux.vn/uploads/files/bedasagudarojoni.pdf In PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/54839584087.pdfIn PDF document text
    • https://kp-bs.ru/upload/files/82857740598.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccc3189ca5---98264314124.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f6a82ab39---kuputoba.pdfIn PDF document text
    • https://baongochoa.com/upload/file/tofanife.pdfIn PDF document text
    • http://charivne.info/images/file/37750688631.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/30653126876.pdfIn PDF document text
    • https://carmelocuritiba.com.br/ckfinder/userfiles/files/33107385711.pdfIn PDF document text
    • http://unseenadventure.com/userfiles/file/77229638745.pdfIn PDF document text
    • http://xn--h1aaebajlcgx.xn--p1ai/sadm_files/zuwitifi.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/revulisomisaragiturokax.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ecf25d462f3d0aeadca990d0d41b57c2/28093152430.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210621155453_nkipdm.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc1e65ec68f---pezijapesefifedigekosawa.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/44458633039.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/9tjli3mkh86kvd09e1eln6vkio/6178600924.pdfIn PDF document text
    • https://heuresromantiques.com/upload/files/zomerugu.pdfIn PDF document text
    • https://patriciogaete.com/upload/file/58253838186.pdfIn PDF document text
    • http://the100voicesofgospel.ch/fichiers/newsletter/file/21175309878.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/42beab74269a6a3278265c6f5c1099f6/rusojopipipak.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/e274efcdc723f0a267a2f1b8cf8a67bf/neradejakexaromifexo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=hydronic+underfloor+systemsPDF 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_off0000ea86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA86 17728 bytes
SHA-256: 351bce3ac169158ce9f6da32bae1ada5064ef6c8d56c5b85a1ef5b4d66ce8658
font_01_sfnt_off00011851.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11851 10680 bytes
SHA-256: 81b3541d973fbecd07fd0648b02c7e1d4fcb4b011b1d24f7b6dbb99da08a364d
font_02_sfnt_off000130c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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