Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8e8d74892f18a5b…

MALICIOUS

PDF

92.3 KB Created: 2021-10-12 00:05:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: f8bdc2833abb2f09f15c2f3fefae9d70 SHA-1: c145b2403ccf03cdc4ed2b6bad7ce63f6884e07f SHA-256: c8e8d74892f18a5bd3bffcbdb35909ae0ffa58dcb69d753ad282492ac00fcc65
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to various websites. Several of these URLs are hosted on compromised CMS platforms, indicating a potential distribution point for malicious content or phishing lures. The presence of these links suggests an attempt to direct users to external, potentially harmful, resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://registermycompany.in/admin/userfiles/file/sonev.pdf In PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/gobimanerurusula.pdfIn PDF document text
    • http://n3ss.ro/ckfinder/userfiles/files/56659265717.pdfIn PDF document text
    • https://aprenda-atdi.com/uploads/files/91979480626.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613af44f1c6f9---bomimovukoxoxedixaw.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/tuxirugezegen.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/27541568919.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/87153556950.pdfIn PDF document text
    • http://midoriku.zaitakunet.jp/app/webroot/upload_images/files/gisexopuvo.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/kixikebakovobenavexuzo.pdfIn PDF document text
    • http://runbo.net/upfiles/files/16335521424388.pdfIn PDF document text
    • http://lscapital.it/images/file/riravitunikinusakukovit.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614a1a633bc3e---54252476268.pdfIn PDF document text
    • http://archive-2014.humandoc.pl/attachments/file/53869143885.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1614c107a9a5b4---vasafazek.pdfIn PDF document text
    • http://santabruna.cl/upload/file/97399565236.pdfIn PDF document text
    • http://think6.net/ckfinder/userfiles/files/20210902204714.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/47984202045.pdfIn PDF document text
    • http://baharev76.ru/userfiles/file/6148573289.pdfIn PDF document text
    • https://mp2020.csysadmin.com/ckfinder/userfiles/files/nulilifojotu.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/gozufumexefuradaj.pdfIn PDF document text
    • https://rizecanreklam.com/images/file/99473221194.pdfIn PDF document text
    • https://salwangurugram.com/files/rizukasinijeb.pdfIn PDF document text
    • https://soechi.net/userfiles/file/46926578476.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/oscUj7J0Gjw/uplcv?utm_term=windows+7+ultimate+build+7601+product+keyPDF 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_off0000f4c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010cd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD9 11592 bytes
SHA-256: 13e40297bb00b6f24f070e8c4fd99278df5cf6c83fc89e6163ae4dc7fcf5471a
font_02_sfnt_off0001284c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1284C 22448 bytes
SHA-256: 1ab1bf157b465df76b369c9186e4faf144a3d8de03ce5f240ebe14c752bfe334

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