Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ce7477f5a36f2d8…

MALICIOUS

PDF

91.3 KB Created: 2021-08-12 04:24:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e09de41a9c9cbf9754943571de4f14d3 SHA-1: e24101c36129040a3a3b38c1664a77287db35fcd SHA-256: 6ce7477f5a36f2d8fd98dc57a4bfeb2d020ee56c04d32f627906aed89abb5c78
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to external PDF files hosted on compromised WordPress sites and other disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the nature of the links and the PDF structure suggest it's part of a campaign to redirect users to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

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 https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071d14d26948---59374158249.pdf In PDF document text
    • https://purefeeling8.com/data/file/ririvowir.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16072ef45b928c---31591763556.pdfIn PDF document text
    • http://carrollcountylawyers.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zodikomexosojopuvavipafat.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/lonepeleluvokowogitabef.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/7f99e39c6377dfbf3a27b64da63b752e/40462358856.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/580eab959236b5d75fad478e9a21d416/pulala.pdfIn PDF document text
    • http://veraschwemmle.de/fckdata/file/28786561725.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/nudimodawovisiwevuxinej.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/64758239223.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f73d95ce7a---15399974574.pdfIn PDF document text
    • https://healthmatters.me/userfiles/file/kolumomevumev.pdfIn PDF document text
    • https://cmoretv.com/userfiles/ximunodikowadu.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/i6g5tn0njlticfijpj2r9kik7k/jukofek.pdfIn PDF document text
    • http://eros-arena.com/eros/userfiles/file/zavarawamofanano.pdfIn PDF document text
    • http://robertoantoniz.com/resources/original/file/nigibulodapaj.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/pamesu.pdfIn PDF document text
    • http://trevelci.ru/ckfinder/userfiles/files/muzamesojokipolesexizo.pdfIn PDF document text
    • http://sportgalaktik.sk/userfiles/file/51055956697.pdfIn PDF document text
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/fd30ef17a56e4bdb744fbdb60340b226/31808825230.pdfIn PDF document text
    • http://ciskmv.com/css/file/jinibumerefivewofojogop.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/83137568888.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa//files/kafoxefab.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078829a5a320---saguvetizesumexigujipisul.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/3129579550.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=baixar+velozes+e+furiosos+9+filme+completo+dublado+em+portugu%C3%AAsPDF 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_off0000ed3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED3D 11708 bytes
SHA-256: 1c7b6eabc94efa87b2ada665385b43d9a8c00121966b00d0e6e55c218837a11a
font_01_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120AA 19992 bytes
SHA-256: 7ae153b2668328bdbe3b9afd611560a5f2349c478a3b66c238c0732db7ece9eb
font_03_sfnt_off00015204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15204 1772 bytes
SHA-256: 172309685fe98285604e713d49568994867313c34855d65ac26f2a3d6e9690f4

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