Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a36dc10bf3084f…

MALICIOUS

PDF

84.0 KB Created: 2021-07-03 05:47:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 9684d1109333112cd1d82b879c16b313 SHA-1: 4a062d5246a32d3d269dfae68eae40a761681338 SHA-256: c4a36dc10bf3084fca37099a90b25fd2719f652a72f8ffaec5bffe1f33d586be
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to leverage external resources for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9931

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://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecc73a880a---40303080164.pdf In PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097650a5ebef---20400312735.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/693dc9fb90288acc51f3a57bd251a564/93083025717.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/86209373050.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/melozakijawef.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609857ad28ba6---kalobeg.pdfIn PDF document text
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/92445109985.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/jvci2ao1hqna25s7r37g3vqub3/falovasanudataferenaneze.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b05faae7d59---1308701111.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/3e6774a7c211c41cbbf7e01e10e71cf2/mevepoguxa.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/reredaxok.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/buzavowoge.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/e3aa4982723c1333ba3c99b4097915ff/wevux.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a73b3e9ff24---71726499987.pdfIn PDF document text
    • http://densayhongngoai.com/uploads/userfiles/file/juvujof.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/df7b17c856bd0fc635d709ca1ae8aee5/20744411628.pdfIn PDF document text
    • https://baxsporthorses.com/userfiles/file/31594789162.pdfIn PDF document text
    • http://davidlbrooks.com/clients/868292/File/87011036088.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bed9d3751f9---88017215150.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/ff7c510097b6dc2d02b2115fb6f9fc51/41575251892.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/c006bf4b862f91e68d9e793fc4fd68a7/64224826175.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/shcvg6d8s8v7kpvlvf2eaardi6/kewuniderutosib.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/14917694295.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=defective+person+meaningPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8CD 16988 bytes
SHA-256: a7e3af967e40bfd157ede0dedf0e7e8a0b193dad1f1a3683cedf7cea1c6c12ba
font_01_sfnt_off0000e1a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 10844 bytes
SHA-256: cd30d66ddfc9e854a8974cb106c8c5a550bf20a8db4e5e9341e6b8ac82a71e16
font_03_sfnt_off000112d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D6 18196 bytes
SHA-256: e9e230570873170786cbbfb52e0facb6a6ceb7817b75003cb8fec9463b93a5c2

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