Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d18fa2ee184ada…

MALICIOUS

PDF

79.4 KB Created: 2021-09-30 11:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 6d8a60573af6c55b154f7568e377a148 SHA-1: 9f609e80cbb368fb825724c6b6d32d1cd21698f2 SHA-256: 35d18fa2ee184ada71c1d7834204d0ac6b6c4ee2fe78dd9af323b7964e45dcfb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://huntic.ru/uplcv?utm_term=android+use+external+camera PDF link annotation
    • http://cathugo-yachts.de/res/wysiwyg/file/18299624491.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/10889512388.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/d3bbb92eec4b469d160aa9fbe92bc4b0/refebarobuzi.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/pawix.pdfIn PDF document text
    • http://ewhamd.net/upFiles/ckeditor/files/devap.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/24864205848.pdfIn PDF document text
    • https://griby.biz/ckfinder/userfiles/files/93141151940.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614965998d53d---80805054820.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/44860814792.pdfIn PDF document text
    • https://cailux.lu/userfiles/files/suvimizatifotugifovis.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/8425866009.pdfIn PDF document text
    • http://gamebonda.com/ckupload/files/pusifijesadizizol.pdfIn PDF document text
    • http://reklama-kemerovo.ru/files/files/noxobotelexafoxu.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8c458e16---gekikepufijivibiluzoz.pdfIn PDF document text
    • http://ksiclubbiz.ksiclub.org/svnprojects/DHD/Source/images/files/57038317821.pdfIn PDF document text
    • https://condicionamentofisico.com/arquivos/file/duzuvowejivokax.pdfIn PDF document text
    • http://joelcsimonesq.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dogot.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/rirexizigulu.pdfIn PDF document text
    • https://felicitareonline.ro/ckfinder/userfiles/files/woxaganamanolajerameja.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614eb9bc7fe40---bakekamotaxozimegomawokun.pdfIn PDF document text
    • https://rux-thai.com/ckfinder/userfiles/files/97821639314.pdfIn PDF document text
    • http://micdelhi.in/userfiles/file/91780846861.pdfIn PDF document text
    • http://ateliergermain.club/sites/default/files/file/sovupadasili.pdfIn PDF document text
    • https://muahohangnhat.com/app/webroot/uploads/files/95615668076.pdfIn PDF document text
    • http://mobilahomedesign.com/userfiles/files/neziwarukej.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/q5uecpd63f2mbfhll7obv4avt4/tozasarov.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_off0000c8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 20660 bytes
SHA-256: e062060d72ec2ee7cfc2a02029bd827bf8ac80a0ca70f02e6385d378c1c93ddc
font_02_sfnt_off000116ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EE 10712 bytes
SHA-256: c84109803c397883ac5ca2afdde07a6dadc8a7c4ec64263d183fa9d65e3a8d09

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