Malicious PDF — malware analysis report

Static analysis result for SHA-256 13132e901bd8bd47…

MALICIOUS

PDF

78.7 KB Created: 2021-09-19 14:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 747ca1653f422b3a581081e2bfa415d6 SHA-1: a909e819687aaf3f3860908b0807137e47a4f24d SHA-256: 13132e901bd8bd47f4bb6be50399ff6e3f318208a4900ffbc782eb60d7a880ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's designed to redirect users to malicious content, potentially for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chia4kids.ru/ckfinder/userfiles/files/pogokidagotokulofisekaro.pdf In PDF document text
    • https://iphastkala.com/userfiles/file/18819301215.pdfIn PDF document text
    • http://dade666.com/userfiles/202109file/2021091123131570554.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/45269890921.pdfIn PDF document text
    • https://electrodomesticaruano.com/images/ckfinder/files/binolofezelofubo.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16140e5762a441---rexukitokonogowiziz.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210916173529.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/g9d8k4aehfs5b7ru0qhfo340o5/dezajilu.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/1auq2oq3afmrq3km6oo3hjpd43/68669244000.pdfIn PDF document text
    • https://fonixkoncert.hu/upload/file/8019212429.pdfIn PDF document text
    • http://jonme.net/ckupload/files/91963194025.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161330e79f21b9---wisevapemu.pdfIn PDF document text
    • http://jayeonrak.com/upfile_editor/2021/files/5222248129.pdfIn PDF document text
    • https://hoatuoi360.vn/uploads/files/97605790648.pdfIn PDF document text
    • http://wedding-box100.com/uploads/files/202109100223357987.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/14922357167.pdfIn PDF document text
    • http://awarelaxcentrum.cz/user_files/file/jasukabezasijomisof.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/dikimazamugaz.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b41ad7e5f1---34144769572.pdfIn PDF document text
    • http://vdi.vn/userfiles/file/gopatigofusekabedolubo.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/41388076762.pdfIn PDF document text
    • http://printific.com/images/contentimages/files/wugek.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/2d37efdba51458a5cc9d2cb5e233fc19/22132190228.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=dead+trigger+play+storePDF 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_off0000c74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC74C 20524 bytes
SHA-256: f5264f944c44df05c7dce241fda28789c6a8197bad3651daaa94753f66452265
font_01_sfnt_off0000fd57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD57 10576 bytes
SHA-256: ac803019bafc0c5d97997e630e97a7f4e31a8a456df7be68a5f2a4320189ca2d
font_02_sfnt_off00011562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11562 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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