Malicious PDF — malware analysis report

Static analysis result for SHA-256 b587fb22f9eec4c3…

MALICIOUS

PDF

82.8 KB Created: 2021-09-03 00:17:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 75febd75c55777ba466cf4c60784317c SHA-1: dd29ca64ef20a381f7a9192d4fee06103bfff946 SHA-256: b587fb22f9eec4c3d6a9343afc773146880fb899711db90f89425bddc40bfc2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan PDF. It contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the PDF structure itself point towards an attempt to exploit users by directing them to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://krisoc.ru/uplcv?utm_term=find+me+pdf+andre PDF link annotation
    • https://vico-immobilien.com/ckfinder/userfiles/files/mevijogasinox.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/fobel.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/gt7gpvjlt26cuffg92f1442iiv/zubadipusodurax.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/27489532799.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/mrv8t10b3i0k99vud8mqlr292p/31052580192.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/16078468bdda43---55045642047.pdfIn PDF document text
    • https://gamaconsultores.cl/upload/file/dulewuserikijofomu.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0bf2981a---49201019862.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160a8b8a89161f---77820188052.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/82752088816.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/duweja.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611dac1e22aa7---78983720403.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/xusajamesiriwifezo.pdfIn PDF document text
    • https://akproauto.net/nbloom/fckuploads/file/41582763707.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/34002363824.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16096827976fa2---79537654779.pdfIn PDF document text
    • https://gitedu.in/ckfinder/userfiles/files/76511138514.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/e8c165cc83f2fc2fd1c4cde1ced3942a/nikobaposot.pdfIn PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/11417a1b7bc75260961ce06b2c9c7c9c/89518144280.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/99263017617.pdfIn PDF document text
    • http://dagmare.de/userfiles/file/53282726180.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/tg8qhe4vg361eat2gkgnn9ioj6/25597186242.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/160c949edceedb---27354447921.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/wojedoladagetaropowixiw.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/17743760047.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_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 10204 bytes
SHA-256: 2d5d9853c1cb068c83437fb6214fea4ea48c7448b4a582ad5461b6ba804cb936
font_01_sfnt_off0000f1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A01 20480 bytes
SHA-256: 2eca761fa0ea611493758b90bb016a687d94f32023534b82b274b7f06d60bed1

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