Malicious PDF — malware analysis report

Static analysis result for SHA-256 3235d72d173e85ab…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 02:19:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a07ad441324907b9fda4b4c00d9f742f SHA-1: ebf230a062a3bc1aae67d8b65bfafe9aa3cf9d78 SHA-256: 3235d72d173e85abb34da685cc1ca0b1da71710b5851764ea2b431a73343faa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links to external websites, many hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the links and the PDF format suggest potential for exploitation or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=brooklyn+nine+nine+watch+online+123 PDF link annotation
    • http://triatlonbizuterie.cz/sites/default/files/file/83371299969.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc59f3d46---gisipixiwo.pdfIn PDF document text
    • http://xn--spreewaldpension-lbben-9lc.de/meineBilderAlbertGrundschule/file/20479982483.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/73373764102.pdfIn PDF document text
    • http://unityproductions.com/upload/files/22948105223.pdfIn PDF document text
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/d4d08c21deaf37c975707640324fc683/poreg.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/vibixawo.pdfIn PDF document text
    • http://jr.ac.th/ckfinder/userfiles/files/77214328817.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/6m5pndbjnvqutgdcahup4tmkca/1041961082.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/64603862399.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/xomazore.pdfIn PDF document text
    • https://dukeofmarshall.com/ckfinder/userfiles/files/56087195869.pdfIn PDF document text
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/ff483d664f7b4e409112deb38acb4aac/6315829090.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/67371342286.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/52371788389.pdfIn PDF document text
    • https://portofcrotone.com/dati/upload/file/jijuxejudekokolem.pdfIn PDF document text
    • http://imoroz.by/upload/file/71481281724.pdfIn PDF document text
    • https://viveironativodevicosa.com.br/ckfinder/userfiles/files/58148060274.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/muzesakedakuwanopukolamu.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/senur.pdfIn PDF document text
    • https://kurashi-kyoiku.com/cms/dat/upimg/file/59828488137.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16137a0ac3fb84---metiwusifofutabasimamodof.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/tukeduvepipevowona.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_off0000d973.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD973 17844 bytes
SHA-256: 13f582a72578afa9c41d6c518b0c86c99e8e28e022d9dcd5fb008fe06cb66b45
font_01_sfnt_off00010793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10793 10848 bytes
SHA-256: b360a6d2e1fa84ba55396c437218060ba399587a24f7304d5cdb5455b0b96eb2
font_02_sfnt_off000120c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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