Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb1ba88335c92e46…

MALICIOUS

PDF

73.1 KB Created: 2021-09-01 07:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 55a69033eb880a880302cbad500d94ef SHA-1: f43a5feab821ef96cd4f911b78f8b4a85d8a5194 SHA-256: eb1ba88335c92e465e9b8c9724a0d27d606fbe0d718674187b9bb2cfeeb3ffd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links to external websites, many hosted on compromised CMS uploads or disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://goldendazzle.com/upload/quangtri/files/lapabuvanenadediladeref.pdf In PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cbfec39bbe8---31127284858.pdfIn PDF document text
    • https://maintogelonline.info/contents//files/samonaziz.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/rewir.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c52fb0fbee---67666514254.pdfIn PDF document text
    • http://geose.ru/userfiles/file/59499687147.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/84722275902.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608183288c099---pefaturolomalofebaduka.pdfIn PDF document text
    • http://becucci.it/userfiles/files/mujazujogalugat.pdfIn PDF document text
    • http://cyklo-sport-servis.cz/UserFiles/File/765787385.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/f6fe025f4d1b5fbfb89eb8810113b428/magux.pdfIn PDF document text
    • http://deshdunya.com/blogimage/file/betapuvuditowukov.pdfIn PDF document text
    • http://skoleniridicubrno.cz/ckfinder/userfiles/files/36899967122.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/dc028b54ad7b71cf9e19a6e93b7d214e/fibogemi.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/bhmegim8r120365p45dd7emukl/jazekobulifabipogulunid.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/83517537906.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/81170173253.pdfIn PDF document text
    • https://brune-schmuckwerk.de/ckfinder/userfiles/files/mudalawuw.pdfIn PDF document text
    • http://scriptonica.ru/files/files/26361290380.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/f74adaa64562717bfad9494b876a6cc5/40379591651.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/nasetu.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/mod6a388r55rp3uqu6eiharp2u/xiditokexigolodat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=what+year+does+the+age+of+aquarius+startPDF 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_off0000baf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBAF8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d30f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30F 10836 bytes
SHA-256: 238c14f93156a490c5ae0ec1b6f9240bfbe49db2bd56ad50a2a04e12ae87b66a
font_02_sfnt_off0000ebbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBD 16668 bytes
SHA-256: deb6c0fecbf1fb58adc2504bba32a2371da2922f6eeaddebe77462e46d12c3ca

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