Malicious PDF — malware analysis report

Static analysis result for SHA-256 f27bb22931ed76c6…

MALICIOUS

PDF

74.1 KB Created: 2021-06-14 02:08:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ac6538885de567ea343c8cdbec6e8ee8 SHA-1: e2c4f37daf257e507882479e8b3929d6bc0c8f8c SHA-256: f27bb22931ed76c68d0144a30e7c14419b982f207d80b34d6e47c9852279dd2e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It functions as a link farm, directing users to numerous external URLs hosted on compromised CMS uploads and disposable domains. The presence of external URIs and link farm characteristics strongly suggests a phishing or scamming operation, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://queure.ru/uplcv?utm_term=nursing+diagnosis+low+hemoglobin
    • http://aiswaryamatrimonials.com/fck_uploads/file/riwemixexulenivezuje.pdf
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/vdg9jbi2qcirpk3pbkbfuqebtp/36646182117.pdf
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/e6f4e37fcd73bad33da8de4918e025ac/rufisu.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e7764fad5---muvilulamuvokuwada.pdf
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/95cv3nb88j99kf9doh9t6odmh2/23168642504.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/f41ru4h412j6d80c6dscd1ebvd/kazabad.pdf
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160b109857c48e---nazopomepifonenekur.pdf
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa087197c---97483172729.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/4461753ae69dc5122a41d3f052cd87e2/66641901938.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16072840a2ad7b---taxivinavuzopo.pdf
    • http://sarljarry.fr/userfiles/file/7772416124.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dc28c7984---15461996943.pdf
    • http://bobiniauto.com/userfiles/file/kosemituvumolagejusijega.pdf
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/64ab52cb3b28b8143b2472dae1bf8d71/dexopizufanaf.pdf
    • http://www.contectrade.hu/fckfiles/file/fotomurinamagos.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/09aab039c5d31aaa39e76351d7bea9d6/56154049438.pdf
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b08565702---48711646432.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://e1pl2.nazwa.pl/busy/fotki/file/6486108596.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6cf.bin
88bffb3868fe19167b5aea5ba10d766d3c5c6c329cdd4d056812bf42bb43739b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CF 5440 bytes
font_01_sfnt_off0000f935.bin
33167644dc0c72380b2a175ef561f1bca71d8eebfdeadf0161937996d0fe4296		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF935 9928 bytes

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