Malicious PDF — malware analysis report

Static analysis result for SHA-256 123a393c55ce296b…

MALICIOUS

PDF

89.5 KB Created: 2021-08-07 13:46:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2a680f7f7575e2d990cb6c7b6c359aab SHA-1: 90d95aa1e4cc1f6975bd264b1ce8fea70eec68db SHA-256: 123a393c55ce296bf9b154a71e40bb1be3b8c45713530e774a380ede3763121c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or other disposable hosting, indicating a link farm designed to lead users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/jiwikokonupim.pdf In PDF document text
    • http://hart-metale.pl/gimnazjum/userfiles/file/33782193442.pdfIn PDF document text
    • http://strap.sk/uploads/file/sovozaxuvofedufuro.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5e142f554---87679849103.pdfIn PDF document text
    • https://selltoob.in/ci/userfiles/files/23998084160.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/nibebujidupifugusetegib.pdfIn PDF document text
    • https://dutchfansitenetwork.nl/ckfinder/userfiles/files/nawezarekawobuxa.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf738115d2---loforulepivumixu.pdfIn PDF document text
    • http://mylodge-naoshima.com/6858312829.pdfIn PDF document text
    • https://dcoderesearch.com/uploads/sitepobofawaz.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/2gj8gk7m9vrq4eqjpoaujvi5b4/nodivanukefusirazoluduvim.pdfIn PDF document text
    • https://bd-sokolovska.eu/userfiles/file/43384670156.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/sazorew.pdfIn PDF document text
    • http://ozdoby-betonowe21.pl/Upload/file/1559746925.pdfIn PDF document text
    • http://ithaca1960.com/clients/8/87/874e400c25abfb160fd1c0cf9913fcd0/File/sazogewadenanu.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/ff34fdda5fba138f6f72e2dc709a7dd9/11263902563.pdfIn PDF document text
    • https://cemb.ca/upload/editor/file/fabuzidosefidifi.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e575f4c2eb---gexuvaruwogulisizizu.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/16076cefb1ca61---kolitezaxoxedojivew.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/d6f44d8f55cb72a82d5e09a095f264ff/56234654130.pdfIn PDF document text
    • https://webvitamin.vn/app/webroot/uploads/files/24401637015.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b52e2578ef---54644282490.pdfIn PDF document text
    • https://dlt-nkp.com/fileupload//file/1570405106.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=exercice+sur+les+compl%C3%A9ment+circonstanciel+4emePDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b62565aaa98---migisixulejafonof.pdfIn PDF document text
    • https://www.unimedbelem.com.br/painel_template/assets/global/plugins/ckfinder/userfilesfiles/72563107009.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_off0000f0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D2 19936 bytes
SHA-256: 9dbb032edca518f07a4b0cec79ea8d3d3f9eff066d83452d178921f903c644d4
font_01_sfnt_off000122f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F8 10952 bytes
SHA-256: b4063724f58e8bd7447ab9d6deb18255d6d6ac00bb15fc4fc5d0f4663129c429
font_02_sfnt_off00013c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C25 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1