Malicious PDF — malware analysis report

Static analysis result for SHA-256 4919d0842c010024…

MALICIOUS

PDF

86.8 KB Created: 2021-09-17 22:34:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cc1169e1d5b182c4ab9002962a56476c SHA-1: e447b19dfe8c23cd863637b7f20b5120221d7d31 SHA-256: 4919d0842c0100240f8cb46a2ce4647ee1f34a0a1ff993a3ab01fc84d6b57400
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file 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 embedded URLs pointing to compromised CMS uploads and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://kelkenaghshband.com/app/webroot/img/files/70432235236.pdf In PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143e527dd272---dabegizibupukiji.pdfIn PDF document text
    • http://as-eng.biz/userfiles/file/51588901682.pdfIn PDF document text
    • https://bunian-co.com/other_files/File/latezafizew.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130af96425f9---pigagu.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/53786814029.pdfIn PDF document text
    • http://ukrkarta.ua/fckeditor/userfiles/file/jomofolire.pdfIn PDF document text
    • https://artedeeducar.com.br/ckfinder/userfiles/files/vuxikiwoziripuxezupan.pdfIn PDF document text
    • https://kontiko.com/ktkweb3/images/upload/files/zumesit.pdfIn PDF document text
    • http://kpotplace.com/uploads/files/49593242309.pdfIn PDF document text
    • http://czechnews.cz/userfiles/files/10201543101.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/nigame.pdfIn PDF document text
    • http://ttccid.com/userfiles/files/zujufalo.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/vevinomir.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/98380413774.pdfIn PDF document text
    • https://psg66.ru/admin/ckfinder/userfiles/files/14014972852.pdfIn PDF document text
    • http://laskod.hu/userfiles/file/ravogamozo.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/e53pbcsfu3715q3dtqdrp1kmk1/mojawuwovak.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ce261aed4f---zewetewebifu.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/arsi5rt5jqbvj318gglvo1dsr5/jezapibekebobusixofiv.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/71313929197.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/sukelawukas.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/38348067133.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=xdrabbit+for+pcPDF 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_off0000efc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC5 10308 bytes
SHA-256: cee7338ea28fe6bc709f6e46b08ad0c2b99e6b931b927d382a7d0e47f4736206
font_01_sfnt_off000106d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D5 18008 bytes
SHA-256: 19f55bab4d5a194b523e4ac2f582e206f8d7a0763bcaa62b6637fd900d47868f
font_02_sfnt_off000135e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1