Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3c1ec2fee77b2b5…

MALICIOUS

PDF

88.4 KB Created: 2021-08-02 22:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5950f4ee5bc27e9219a646c5f3f3d1d5 SHA-1: 376a6460a397e2fc10cec9dd5c42301a68c79cd6 SHA-256: c3c1ec2fee77b2b549b4b9357fea6714600e29c979d465fc368c8b5deeafe105
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to compromised WordPress sites and disposable hosting, suggesting it's part of a link farm designed to redirect users to malicious content. The PDF structure itself appears to be a lure, potentially exploiting vulnerabilities or leading users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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=can+i+share+videos+on+discord PDF link annotation
    • http://portalkucharski.pl/app/webroot/media/files/libiramipavebigagev.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/adscsupaf6027t37uga40pf0a1/20184257527.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/xaxiditinapodemezotaku.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/960eea1a66d6cc8c784196082163b62d/55564692236.pdfIn PDF document text
    • http://bitite.lv/media/txt/122/file/mapelizedujekinemuzep.pdfIn PDF document text
    • http://kaithompson.com/userfiles/file/64337524335.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1bf7ae3a---8631898029.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/73918928858.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/68452787014.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/249f7ec372302847bfc2f04e2ceece22/9961320977.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/pebogudijeguzabad.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/7lrgc6mab21tgrkci072cutnj3/malexogojazozinatajoras.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa095c0a4---45029215519.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/fa743aa985367c6a09afc3ff87a9c3e6/44858291212.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/bizifefaduxevopu.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/fejajiduzazewolivebomepa.pdfIn PDF document text
    • https://mundolibre.cl/uploads/userfiles/files/7614984431.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/o02q6pmo3kclkcl9cp0b6t3rr3/sitorodovorovip.pdfIn PDF document text
    • http://www.farparts.cl/wp-content/plugins/formcraft/file-upload/server/content/files/16098709568a05---sivosuxijegedukuz.pdfIn PDF document text
    • https://alutat.com/data/file/11555519860.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/i1o6lue4vd01h1gibpnrcb37il/dejuwotutuxuxukar.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717e0ebf6bf---tajekalasipux.pdfIn PDF document text
    • http://mispuntossaga.com/campannas/file/91753146927.pdfIn PDF document text
    • http://mopi.eu/ckfinder/userfiles/files/72463576741.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_off0000f760.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF760 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F77 10420 bytes
SHA-256: 186e8ef5643107c236c7df7fd3d003f285c54144155135b2b7f504a2cf18154a
font_02_sfnt_off00012709.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12709 17016 bytes
SHA-256: a6f9c95c8d98c67437bad3e3005dba1019b1cf4e6bf04773400cc2392351cf8d