Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b988af7fc9cd7cf…

MALICIOUS

PDF

84.5 KB Created: 2021-09-07 10:55:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d36283043ee42746681233ced94987a7 SHA-1: fdf8c35877534881e167b4a927f8501b4767dd2c SHA-256: 2b988af7fc9cd7cf73fcc03db29b9ae636d68f2be8e77a91eeb55e62da3b9ab9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it functions as a link farm. Multiple URLs were extracted, some pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to obscure the final destination. While no scripts were directly extracted, the nature of link farms in PDFs often involves JavaScript to facilitate redirection, aligning with T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://elesud.it/img_pagine/file/39495989580.pdf In PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/wutiwikopedo.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/50577154912.pdfIn PDF document text
    • https://zzwgjx.com/d/files/wefewidaxogavuzufojufe.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2292a374cae73b81ac9e52b7ba0cada3/12111301954.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/dagowegomiwagem.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/jovekuwamebumawerop.pdfIn PDF document text
    • http://cnp-inc.com/ckupload/files/xalipipokodobuxaxepap.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/160986ef34a3a6---tatinanojugogupujadose.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16094dc0360a2e---sejusirigewi.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/6ef6064adea3e71afa4b3e1be13e47bd/55172195014.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/42f66470768755d563c998499ab9bf5d/mubulififemeruxavebo.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fb30e4d000edab1d8a1f5e627e88bea9/95801302226.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160878c70c6625---45283914583.pdfIn PDF document text
    • https://www.sterlingsez.com/ckfinder/userfiles/files/97817015958.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/65467744237.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/ifshdbtuouf3jqhn0sqrc1ljfm/guzomipibakalepuvifimi.pdfIn PDF document text
    • http://chono.mn/uploads/userfiles/files/62148285567.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/78107750578.pdfIn PDF document text
    • http://sherwoodchambergolf.org/ckfinder/userfiles/files/2118391943.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210730001650.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/bonuzikoxemebibijezom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=dactiloscopia+comparada+pdfPDF 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_off0000e48d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48D 18140 bytes
SHA-256: 2307bea25d6f81a6f4db96279819b8b030472e28e2a14175c7277fdf5f19b4fd
font_01_sfnt_off00011423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11423 10544 bytes
SHA-256: 89653b7abf6b4b4395fc3597d01334bb816cac871419545469e0d41f9530fcb2
font_02_sfnt_off00012c30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C30 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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