Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ee61a387112a1cd…

MALICIOUS

PDF

91.1 KB Created: 2021-09-02 16:10:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03de197195df02327f152e54504d6517 SHA-1: 158f8f8ad39e579108f2bd5094002e49ea865770 SHA-256: 2ee61a387112a1cdd5996a16461f7239baf205c852d01c366144ceb8e6c1356f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan. The primary attack pattern involves directing users to potentially malicious content through a link farm hosted on compromised infrastructure.

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://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/b4638d3149d2db6c116dcdc7cc3686d5/15014489836.pdf In PDF document text
    • https://specialbrands.gr/wp-content/plugins/super-forms/uploads/php/files/79ff32602352b1b1b5d6af81855d1f3c/15999709924.pdfIn PDF document text
    • http://gotween.com/userfiles/file///gubol.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/dotepimot.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a0caea8b127---33277119256.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/woritaxutimetagugijiru.pdfIn PDF document text
    • http://www.urbanwaterways.info/files/nokidezaputoneletukupon.pdfIn PDF document text
    • http://ristoranteyuri2.com/userfiles/file/nelotewumekuvupifa.pdfIn PDF document text
    • https://juhaszautovill.hu/userfiles/file/61002347130.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/futazofusojajoxijejozosir.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/24616571650.pdfIn PDF document text
    • http://gesgo.de/userfiles/file/65857554254.pdfIn PDF document text
    • https://airshow-bg.com/file/kagejujojigumozuzejetub.pdfIn PDF document text
    • https://carparts-fixture.com/file/file/lemefofowetidabiwezamogav.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/dawesikulunirofakaku.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b75bf7a72fc---jikalikeloxuxije.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2d3e28ecf---79719811872.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/2fbadb8a2315c17137aa2d9c86910b8c/46911849247.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e0bd2a9fd0b68fe5ee5bd8ae375f5659/pawanafadu.pdfIn PDF document text
    • https://bepxuyenviet.com/upload/files/85571319141.pdfIn PDF document text
    • http://aliglobshop.com/userfiles/file/57453458511.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/40772749747.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/cf1e2504b23fe4bfe8b91facf3d3f074/rofefafexataxofexosutin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=un+inconnu+a+cette+adresse+pdfPDF 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_off0000f5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 22020 bytes
SHA-256: c2884cdc0f12b005265c7121c36faea1f83ffec4b8dfb4abf343b786a623cc9f
font_02_sfnt_off000144fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FB 10676 bytes
SHA-256: 201bd40e5cbc3d9df3735ed463158ff9f445a9794466c36803b8ee1a487debf6

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