Malicious PDF — malware analysis report

Static analysis result for SHA-256 b29df726c4954da7…

MALICIOUS

PDF

87.9 KB Created: 2021-09-18 05:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e1a2394a6c6ff06b9b6fe219e98c2281 SHA-1: d08afd5fab5babaf59dcf7d55462b4a9d25762bf SHA-256: b29df726c4954da776b8c0c611d0e27b1a8c035b00e3bb2f1222570a87a1d087
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs that form a link farm, directing users to various external websites. Several of these URLs point to compromised CMS uploads or disposable hosting, indicating a potential phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://pistant.ru/uplcv?utm_term=how+to+download+photos+from+my+android+phone+to+my+computer PDF link annotation
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/81763586996.pdfIn PDF document text
    • http://sweatrinserepeat.com/ckfinder/userfiles/files/wowof.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/8e9a9d6ac940c3367289a9b4f165e604/29979817544.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/kaduxiresowofovaxatibale.pdfIn PDF document text
    • https://aaaxxion.info/images/file/risukeno.pdfIn PDF document text
    • http://simoncaulkin.com/images/tisudunupirude.pdfIn PDF document text
    • https://er-cardiff.com/eurostyl/photos/file/gupumoga.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/52466139327.pdfIn PDF document text
    • https://b2b-intelligence.it/uploads/file/lagaleperurulizijakirik.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/tifanabebo.pdfIn PDF document text
    • https://tradingcall.in/ckfinder/userfiles/files/17447985270.pdfIn PDF document text
    • http://opuspointpartner.com/ckfinder/userfiles/files/pagasewasamum.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/93d40ec9e6538b77b08a100e54283f6f/deziwosavanu.pdfIn PDF document text
    • http://guanzhuli.com/userfiles/file/kititisitonipam.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16133f47a2f8c1---tamopimifelodabivepa.pdfIn PDF document text
    • https://g55net.com/webpagebuilder/ckfinder/userfiles/files/rudesobalanapufez.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/78103160335.pdfIn PDF document text
    • http://royalleasingny.com/admin/images/file/nuvevagetojugokad.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/ert3p7e7brru29k0h2scnicih3/68868712305.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613673c6992d8---92358721085.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/86132931403.pdfIn PDF document text
    • https://abctranslink.com/ckfinder/userfiles/files/83184362826.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4e1ad3e6e---gexesapuvuwogi.pdfIn PDF document text
    • http://childprotectionindia.com/lexcyberia/userfiles/files/22823337269.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_off0000f000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF000 18348 bytes
SHA-256: 07286146f17c263d423264be7ad0a956163e574391e59ba9f049f31e36b6f036
font_01_sfnt_off00011f78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001378f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1378F 11176 bytes
SHA-256: 7944fc9c3084c2f48595b412c38f136384a41eae246d63e8a71380bcb6f6d17f

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