Malicious PDF — malware analysis report

Static analysis result for SHA-256 3934b818feac3273…

MALICIOUS

PDF

90.2 KB Created: 2021-06-11 02:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f6cdd0e7a73269bc2e40308b24bc056f SHA-1: ba9251c8a55f1e2e7031ba828c305b0de0dca653 SHA-256: 3934b818feac3273716287f00afc50a7840bc9c5344b04908be8bc9be2c380d4
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress installations, suggesting a link farm for phishing or malware distribution. The document body, though heavily obfuscated, contains text related to an 'answer key', which is a common lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the redirection of users to malicious sites via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://coretry.ru/uplcv?utm_term=gizmo+feel+the+heat+answer+key PDF link annotation
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea7af0e41d---zuwokivizewi.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/9960d0942974f22c599d872d588933dc/71488758609.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/752f05234bc30e09b449b1292f52cac5/86964930800.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0de8875b21---18169621311.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/tozuvot.pdfIn PDF document text
    • https://www.propertyadvisersaustralia.com/wp-content/plugins/super-forms/uploads/php/files/ac5db558fe48ffff65c600164b086a16/sokovamotom.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16087f8d04020e---rozodomafazoxizuw.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/6046379370.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/59932762229.pdfIn PDF document text
    • http://www.nandomoraes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f032a9eaa---35863281976.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/5gk3r7pu7i1vqfqc8afoiag3ce/muzopexelabusigulojoz.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/17391434143.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096c0e84aad0---47433503040.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/fomonokiwanumefuki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 5344 bytes
SHA-256: 19290653dab87e91b2e9e768e386cda6bf2dcfd4c0628cc70cc93ea7c1cba4f5
font_01_sfnt_off00013182.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13182 12536 bytes
SHA-256: 06f8c64cf150fa3b5a73fd6af603099ae8cdf50df7bd9de8c67ac0a176d3e9f1

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