Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81cb8d524786740…

MALICIOUS

PDF

82.0 KB Created: 2021-09-16 20:02:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: acff53e37b1a4ab157e0182f0fede0f6 SHA-1: 2bdd53d99145f54a526dd367d4268945ad917ffe SHA-256: f81cb8d52478674000dd5818316e5d8c8c50954261cc29a42252f0012f99740c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://luxesystem.site/js/ckfinder/userfiles/files/38151942705.pdf In PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/24289676341.pdfIn PDF document text
    • http://kelvista.lt/images/files/xukan.pdfIn PDF document text
    • http://dc-3ed4d7413bdb.prshots.de/uploads/userfiles/1630665070/files/kewokonewek.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/11992136031.pdfIn PDF document text
    • http://taiwan-casters.com/userfiles/file/siziridipi.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0f666b63f---gozojesojo.pdfIn PDF document text
    • http://sunway.me/uploads/file/010109308626.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/12230731875.pdfIn PDF document text
    • http://pharmorgsyn.com/upload/files/xogojasiwo.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/kamewukakenevos.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/6131406712.pdfIn PDF document text
    • https://khambenhxahoi115.com/images/files/zapizunizubawoxe.pdfIn PDF document text
    • http://mhzsolutionz.com/userfiles/file/sasevetifusuxisev.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/20788779854.pdfIn PDF document text
    • http://www.520amis.com/upload/files/makug.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/08f48b79ea5dbe47feba58aa4ddbdf0e/wujomepubawadavemedur.pdfIn PDF document text
    • http://www.musicboxpiano.com/contentfiles/jatokifunugofi.pdfIn PDF document text
    • https://robertbah.si/files/file/piperunuwovovavubor.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c7f07949f83bc52d39936cfcdfaf4428/46394600566.pdfIn PDF document text
    • https://praktijk.zorglink.nl/ckfinder/userfiles/files/sefavarevogudumogi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=news+republic+apkPDF link annotation
    • https://www.thc.gda.pl/ckfinder/userfiles/files/52976969042.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_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 19456 bytes
SHA-256: e7658075874be025c8d670e711c3cb609fea9b60f953031739d961264dc611f7
font_01_sfnt_off00010b0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0C 10440 bytes
SHA-256: ec8a78bf381c530719b3faa375b153098d53cea2ed3eb3920765d2f48952657a
font_02_sfnt_off000122ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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