Malicious PDF — malware analysis report

Static analysis result for SHA-256 8967e3cc087723ae…

MALICIOUS

PDF

77.8 KB Created: 2021-09-17 21:00:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f40c087ac4a8e2b5f2ccc679f57a8ebc SHA-1: 6bf9aa4f53b628a6cccd3a7b0a2f6fc22c29230e SHA-256: 8967e3cc087723ae05a0141e2144df16f0ae5702010ae1d6bec1cff5081c103d
156 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly suggest a malicious intent to lead users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://skillmapmagazine.com/ckfinder/userfiles/files/95394123548.pdf In PDF document text
    • https://mimpidia.com/contents/files/kokigexafavos.pdfIn PDF document text
    • http://sitoad.com/bbqjoekey/files/202109160412064726.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/23130845640.pdfIn PDF document text
    • https://photojet.net/userfiles/file/17566960995.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4169f477---wofibuzefukajogugub.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/47358866274.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/fesipogekozodufowexivuz.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/885a26f1889e1e47b6d52fdf8e3e2f6b/99884694527.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/4429716412.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/jaduf.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/994910019.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36515801845.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/19584503027.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/49328883353.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300e4435015---militemu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614439cc6b53f---24450035950.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16134ec5d632a0---11876794417.pdfIn PDF document text
    • http://thietbiotoviet.com/Images_upload/files/fazivutigox.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/21261724073.pdfIn PDF document text
    • https://goooinggroup.com/userfiles/files/20210910_040623.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/97598965792.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/40103448595.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tb12+method+pdf+freePDF 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_off0000cbbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBBF 10464 bytes
SHA-256: 9fe9150b1560341ede4af8bb19f0c906097af022952d61c4acd21df6569f070b
font_01_sfnt_off0000e350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE350 17784 bytes
SHA-256: ea4b4a8555a4519a1656255a1f27a345932fc871c7fc9b01bad8eda426ac5753
font_02_sfnt_off0001116b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1116B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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