Malicious PDF — malware analysis report

Static analysis result for SHA-256 92f3011255ed3361…

MALICIOUS

PDF

79.9 KB Created: 2021-09-07 16:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: aa037f7fd77edec479b244af6dace49d SHA-1: 295c85cdd516b83caad94dd761391e72ee805bf0 SHA-256: 92f3011255ed3361a8900299b97733c40d8106394924924ef47c8169760cb9f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many pointing to compromised WordPress sites, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure as a link farm is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=ryobi+long+reach+hedge+trimmer+manual PDF link annotation
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e31b2df0fe---59295850232.pdfIn PDF document text
    • http://sanraimundo.cl/dyn/uploads/file/dopetaluzedunivov.pdfIn PDF document text
    • https://heritagecambodiatravel.com/userfiles/file/veladajix.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b4725f4f9f0---21741618997.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/3bfb0b842c0f55454eff5c4117013faa/vevubeb.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bbca67072---fopebezadiwotafopesejen.pdfIn PDF document text
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/7951c7ea5f0f53e9844aabe278e3589b/57060157415.pdfIn PDF document text
    • https://onlinendttraining.com/files/gitogati.pdfIn PDF document text
    • http://esistore.de/userfiles/file/fexomisewej.pdfIn PDF document text
    • http://www.idenet.net/wp-content/plugins/formcraft/file-upload/server/content/files/160942e2046fc1---putopopazorexovuguma.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/0d040d96609bbcdfe5a066b856a10e84/46854039707.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a4e851e2a21---26090780431.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d37768befc---52999455018.pdfIn PDF document text
    • https://www.skyline-recruiting.com/wp-content/plugins/super-forms/uploads/php/files/2819126e19ccfdc49ae70c3c317b7e0d/ninidunilulotinorokegi.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/0670fa57aec885394a77da24e37c113e/91591335880.pdfIn PDF document text
    • http://fsgpj.com/upfolder/e/files/20210809095411.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/pinaxafimagoruferiwalerib.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/6222156372.pdfIn PDF document text
    • http://xaydungphongphu.com/uploads/files/pizojikarowalabu.pdfIn PDF document text
    • http://catherine-massage.com/ckfinder/userfiles/files/58249702229.pdfIn PDF document text
    • https://przyklejki.pl/userfiles/35264644409.pdfIn PDF document text
    • http://highspiritsmusic.com/ckfinder/userfiles/files/jafuguj.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161289d11bbcac---14713321428.pdfIn PDF document text
    • https://ms01bet.com/contents//files/xufumefivotekodozitom.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb538628ab---29023283409.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_off0000d69f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD69F 11048 bytes
SHA-256: 83c8a92bffa5d2889be5d7c9dca2db0433d3da69624c39a32d1ae4b9f149d691
font_01_sfnt_off0000eff7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010809.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10809 16564 bytes
SHA-256: 55b8d567660999b998ae96a8c4c9b5f13ad2a77a2bdffc6f8ad127e28b20dc86

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