Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e74cbcc90f35420…

MALICIOUS

PDF

73.7 KB Created: 2021-10-23 00:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: b03df7a7a58976ca0b31025e5983e34d SHA-1: fa33df8c37452c3495747637a08f93ea49ba64d0 SHA-256: 3e74cbcc90f354200afa5c59aacb4ac5e80a59ebd78d7777b986b403efd8002a
156 Risk Score

Malware Insights

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

The file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Static analysis revealed that the PDF acts as a link farm, with numerous URLs pointing to compromised CMS upload storage and disposable hosting. These links are likely designed to redirect users to malicious content or phishing sites, consistent with a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://ildongwire.com/userfiles/file/22425092625.pdf In PDF document text
    • http://hoaisonland.vn/upload/files/17139219800.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16155dcea4e3a4---regowatorubop.pdfIn PDF document text
    • http://kondicionery-dzerzhinskij.ru/upload_picture/file/73569437908.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/sipagopepuwidorolelajin.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/3ad686e8c1be8b9e6826937167d948d1/68986183911.pdfIn PDF document text
    • http://15881588.com/ckupload/files/64650096774.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/fokabiroruxineg.pdfIn PDF document text
    • https://abbma.in/admin/uploads/file/puwegulufonukeguxumabifa.pdfIn PDF document text
    • http://derp74.fooden.com/UserFiles/files/fuwenagodipo.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161614eda32542---95153849969.pdfIn PDF document text
    • http://ahzycw.com/upload_fck/file/2021-10-3/20211003024632139197.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/d57192340580b162b594f4ea11ae6e17/75273134466.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/nipuvilikosenanumujavu.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210930150306.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/xexobovit.pdfIn PDF document text
    • https://drddvichitra.com/userfiles/file/jifanulefezabimuvixaxo.pdfIn PDF document text
    • http://drapikowski.pl/uploaded/fck_files/file/14608446658.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/2923aa4fe3f1f5a6d2f28d4f05bdfb95/wusoj.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109230124153699.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/wedufozonedem.pdfIn PDF document text
    • http://grappin-annat-como.com/userfiles/grappin-annat-como.com/file/84316848368.pdfIn PDF document text
    • http://fcgo.tw/uploadpic/files/21590618531.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/xPAns0MRe5M/uplcv?utm_term=all+in+all+guitar+chordsPDF 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_off0000bee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBEE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d6f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F9 10600 bytes
SHA-256: 211d88cc3fda14be858b839fca141b28e5f7a80c6f892bc44a720a7d36b37ec8
font_02_sfnt_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 16236 bytes
SHA-256: cdf48fa04aecf3fe52ce83142fc671c2213ba598050b0eae9ab9b846543926b6

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