Malicious PDF — malware analysis report

Static analysis result for SHA-256 abd764fe3353a95a…

MALICIOUS

PDF

75.2 KB Created: 2021-10-16 17:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9710bd1655ee713af5eb3560f9da8957 SHA-1: 1e88c9eae969c522a81d8d02ea55d69606a3879c SHA-256: abd764fe3353a95aa5bd594390ba4f80e4151fe221c12445d4b3e3cfe56b421d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and is part of a link farm hosted on compromised WordPress sites. The heuristics indicate it's designed to redirect users to other malicious PDF files, likely as part of a phishing campaign or to deliver a second-stage payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • 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://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161663bfec6865---14420793410.pdf In PDF document text
    • http://gbfrjournal.org/pds/userfiles/files/fajefevatimafuneza.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/20668417973.pdfIn PDF document text
    • http://augustaelectricalwork.com/editorData/file/rafonirunifafowod.pdfIn PDF document text
    • https://bozoklar.org/ckfinder/userfiles/files/3788736875.pdfIn PDF document text
    • https://voicelux.ru/wp-content/plugins/super-forms/uploads/php/files/0481e3d41a0193b45b8923921a5dfec4/ruropulajigam.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613355a2a6f2d---99600540898.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/38623215761.pdfIn PDF document text
    • https://ipmgrouphr.com/uploads/news_file/nupoloselekawizagirumo.pdfIn PDF document text
    • http://1night2day.com/UserFiles/file/sujovikoxujowaveveme.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/junukogunali.pdfIn PDF document text
    • http://surestegc.org/documentos/file/werutojezobijatofiz.pdfIn PDF document text
    • https://aneri12.cz/res/file/wuset.pdfIn PDF document text
    • http://snbedu.com/uploadfile/file///2021100119253317.pdfIn PDF document text
    • http://chistogood.ru/admin/ckfinder/userfiles/files/fekop.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/tiwawe.pdfIn PDF document text
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/vobijutarotowezu.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/36839416530.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/40886535914.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.com/userfiles/file/fevefolabaragukaw.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/6369fb24b03fa7e3faef7833c942dafd/66118329799.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614855db4ac3f---timivowalemefavekiga.pdfIn PDF document text
    • http://deborahmayerlawoffices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xifanisujapezajasuw.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/06a313544e92017f3d99c16ce8c68d1a/rifefidifotejukiximeb.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/KGDyd8lM0uI/uplcv?utm_term=general+sports+termsPDF 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_off0000c507.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC507 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 16664 bytes
SHA-256: 31dacc1432061299b5aa6e7b0c86398c7dd08003308cd8b13e2b8499d17b17f8
font_02_sfnt_off00010825.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10825 10360 bytes
SHA-256: 40e0c54c2df177bd6ec1bbc50d33468b3781cf1af2a24b8ba56050ef513159d7