Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9caa4d8f6e9c4f7…

MALICIOUS

PDF

87.5 KB Created: 2021-07-06 20:13:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 1c431449b3593f80a8febfefbd18e8b7 SHA-1: a4b9228d2afb164c5e07f5e2d480fc3b9068da1f SHA-256: c9caa4d8f6e9c4f7f1efa7d5b610fd5a371784c0b8560b21f090114df154433a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised websites and disposable hosting domains. The embedded URLs and the nature of the heuristics strongly suggest an attempt to distribute phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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 https://inwebjor.ru/uplcv?utm_term=homeopathic+medicine+for+ascites PDF link annotation
    • http://josephlillianmorrisfamily.com/clients/59960/File/tupisitik.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/3bbr6051u4ti5s78v0rc7a0qa4/wulujefawinofiwufepej.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160996529a53dd---40500261349.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/bc5f7eb296395c45058889a2ba20b7b7/zagujofosaluzika.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076c07614d25---85082382721.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/82799743131.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/160bdc56b7b7ba---nezatamemusutud.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/35644820400.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095fcd675de5---risarojejijidus.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/28150448290.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080cdd78c285---86872116544.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/mjnfq7h3ublbskuoe4ph23d7i1/3151101498.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/muguvevenatalexugixifegi.pdfIn PDF document text
    • https://eberli-medical-supply.ch/upload/file/lexitaluzifexukata.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/tefabokaranorit.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e123bfe4f---zekoradebe.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/fukubu.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/25894022386.pdfIn PDF document text
    • http://learningkey.org/userfiles/73376232400.pdfIn PDF document text
    • http://donateagift.eu/userfiles/file/42794397284.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/94809840318.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/takiralosubomigepadarum.pdfIn PDF document text
    • https://tappowine.com/file/woruxefugisa.pdfIn 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://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_off0000f396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF396 10828 bytes
SHA-256: 9ea5cb8e8163f0cc8c854a9778035d7f9b26d9ba282ca88d17cfdd6d37f80fcb
font_01_sfnt_off00010c4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C4F 16736 bytes
SHA-256: 1093e00aacdb4406f2fdeebe96196930f53cc5fcfb53f2c7e7fdc3c41e4b3a7f
font_02_sfnt_off0001373f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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