Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec5a86899543c385…

MALICIOUS

PDF

85.3 KB Created: 2021-08-01 08:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 8130842da53e0f99c9f2ecf3bf51d9ca SHA-1: 520241f08fd6dfb2a8172e24c6299785cbf4c6d9 SHA-256: ec5a86899543c38595991675dfd640f371afb63b77416fab82788fa6716f31f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to potentially compromised CMS upload directories or disposable hosting. While no scripts were directly extracted, the presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests an intent to redirect users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://rsun.pro/admin/ckfinder/userfiles/files/41990507536.pdf In PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/44003318509.pdfIn PDF document text
    • http://brucemsmithlaw.com/clients/e/e2/e252bfde01ef004f685a9648d307a4b9/File/92793716293.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/ruwewunudomajepejavurowi.pdfIn PDF document text
    • http://thunderstar.cn/userfiles/file/20210510051553320088948.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/ca6cd317c8f9311074df695ae26daca9/goxizelenejiramet.pdfIn PDF document text
    • http://myphamasia.net/upload/files/nuvegejikofen.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa77c609a23---lunibedomogaz.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8af811a5f---vudas.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/tufidagumi.pdfIn PDF document text
    • http://adhdesign.de/userContent/files/20210627134412-ruzovuroketo.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/d65ea289ceffce665a996dd015b08d02/fofuko.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/79925027986.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/84840890867.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/doxeguj.pdfIn PDF document text
    • http://umiyawoodworks.com/fckdb/userfiles/file/selosufug.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16083280eaec1c---77155343556.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/77443867965.pdfIn PDF document text
    • http://lg-palette.com/upload/files/67534387302.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/tojojodepamesagisafojis.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa42faf3ada---remirala.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/mijavodoxe.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/vizowojinodoje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=cara+mengubah+subtitle+inggris+ke+indonesia+di+youtube+androidPDF 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_off0000e8f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F6 11172 bytes
SHA-256: 91b00c734cfd2e3ccd86cdfb15cd9b5df2eddb28196cf1fb981c78c7d4de8c9b
font_01_sfnt_off000102ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AD 16276 bytes
SHA-256: ff53ecdecaab1095a39fb1676814501503b6d7d2640fd80bd1953ac3650e279b
font_02_sfnt_off00012cc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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