Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec59cf80073d65a…

MALICIOUS

PDF

99.6 KB Created: 2021-09-19 03:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 26b53c5ee11feec4121ae207c5db58f6 SHA-1: 5d0a429964d5bf040b15a5fb8207c45f54ca303d SHA-256: 4ec59cf80073d65a4c4ed340ef9420fff01b523f3bbfe3e3bf59e35c0114bcfc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. The document contains numerous links to external PDFs hosted on various domains, some of which are identified as compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://energo-market.ru/sadm_files/76012353041.pdf In PDF document text
    • http://novena99.com/uploads/files/202109062145238349.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/53371284374.pdfIn PDF document text
    • https://klcconsulting.eu/klc/file/50823422041.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9141b2c26---zasabi.pdfIn PDF document text
    • https://my-natural-style.net/upload/files/tijunopanefesolejimax.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/39075673099.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/tuwegozifawigivorudirav.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/8623060536.pdfIn PDF document text
    • http://holidayinntorino.com/userfiles/files/22156524305.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/50000238140.pdfIn PDF document text
    • http://koreaseowon.com/ckupload/files/74875750436.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/lopuwalumigubisawakajezep.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/rokupebamugewozilo.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613abb025c1cd---lotukobimixedunupu.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/tediromadutinowifu.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bovawagabu.pdfIn PDF document text
    • https://svarovanijelinek.cz/ckfinder/userfiles/files/15881057364.pdfIn PDF document text
    • http://csc-028.com/userfiles/file/20210908010750_c5jj8g.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/toxenagimisut.pdfIn PDF document text
    • http://baikalspring.ru/ckfinder/userfiles/files/dovozizevimokoxo.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1613945e3c8609---341874121.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/zulovovis.pdfIn PDF document text
    • http://855solution.com/htdocs/cljr/data/files/mapomizogil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=moto+g9+plus+android+11+updatePDF 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_off00012095.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12095 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000138ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138AC 10880 bytes
SHA-256: a6d923342815923af0820c61415697433019d522d804289f3802c0124b65da72
font_02_sfnt_off000151d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151D3 17872 bytes
SHA-256: 0eaca8d42b9bba1bf5cf54dbcf38c9774c85c94d2024c0f8c36c018eddb2fb3c

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