Malicious PDF — malware analysis report

Static analysis result for SHA-256 de5dabe43954e137…

MALICIOUS

PDF

78.5 KB Created: 2021-09-22 17:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 714f2311a5aa391c61310417abffedf5 SHA-1: 7109d4f8c13eb345a16bfbf114c83aa6fcaed1ee SHA-256: de5dabe43954e1376d30572d5383e29b152e6512e9b5cc2c84b817380a865719
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS platforms or disposable domains. These links are likely used to redirect users to phishing pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://catamma.ru/uplcv?utm_term=super+sound+editor PDF link annotation
    • https://perfectsextherapy.com/public_html/userfiles/file/91064067365.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/53901033444.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/xokowuf.pdfIn PDF document text
    • http://challendor.com/fckeditor/upload/file/48514591643.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/r8vaoa24r2h5pejn8edhcoqhgo/xonavo.pdfIn PDF document text
    • http://melly-incendie.fr/img_db/87549518129.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/45086408387.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/165b66c28bf4460b2ca1633a14c4263d/81808029198.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/viwosodixotorolila.pdfIn PDF document text
    • http://neteyes.eu/editor_up/biwez.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/67b881f1be2c96936e81c747c1f03bcd/153493024.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/dizusupamuzow.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16147517e092ba---40263836101.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/javizifiw.pdfIn PDF document text
    • http://paletydozahrady.cz/ckfinder/userfiles/files/nekefiporej.pdfIn PDF document text
    • http://pnc21.com/files/fckeditor/file/1657947052614aef7a49279.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/vuxuwil.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_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 10352 bytes
SHA-256: 86ea3e997737c6628b02faf723afdb0f33d569dd80025d84fb5f29f8c32e175c
font_01_sfnt_off0000e646.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE646 17960 bytes
SHA-256: 619f6bfe6b489fae92bb35e26b3006282315e5d4262dffea55329f3b4c1cbb93
font_02_sfnt_off00011579.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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