Malicious PDF — malware analysis report

Static analysis result for SHA-256 663ee06f01653542…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 05:33:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 413e5b2f4abfbc18e304970f0ce2340e SHA-1: cb9b14162ce47195c687e97a8293e4b7c91b0ebd SHA-256: 663ee06f01653542dd42d2be9f91b945ca89c9e9ab56a1e552c089a4ac760f55
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 file contains a large number of external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs indicates a phishing or malware distribution attempt.

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://garglob.ru/uplcv?utm_term=i%27ll+fly+away+free+sheet+music+pdf PDF link annotation
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a2526a073d9---bumebuzaxudax.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160e237efb0b58---92438231224.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/gofap.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/77ee4d555bfeb76152eb89aa9fff1ef6/vaxoletubodamumemejosaje.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/947340d4b24e4302b8a509afdbf69888/37196611241.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/66c08a6b6a2ccd34fde970b264b3355d/favimubo.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf3144879e---75224782780.pdfIn PDF document text
    • http://www.mearesandassociatesllc.com/siteuploads/editorimg/file/47090331185.pdfIn PDF document text
    • https://marblobathware.com/app/webroot/img/files/lotarasutoritebadofimoris.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca2928b25a---68617623562.pdfIn PDF document text
    • https://dcimx.com/files/jebepukazumumomeve.pdfIn PDF document text
    • https://talenthunt.biz/userfiles/file/pavosolamekapalu.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/jinipiguwopax.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/pafudivasuso.pdfIn PDF document text
    • http://jnafarms.com/clients/864068/File/84233047773.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1611df32628d38---mepelofaxapuru.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/87737365028.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/benanoj.pdfIn PDF document text
    • http://washchienluoc.com/upload/file/94478316288.pdfIn PDF document text
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/cf018bfb65e3f91c428acf77c8b3c103/52653898986.pdfIn PDF document text
    • https://cmottaviproductive.it/uploads/file/77036342536.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/1854deaacc07efb90aa344e707e70262/dubebebijekanifego.pdfIn PDF document text
    • https://somogyplusz.hu/files/kifofidirimo.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_off0000d585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD585 17248 bytes
SHA-256: 2ab4740910a6ecd8317439354597ca222333fd2a57eff0b32e8c34f4229b7c4a
font_01_sfnt_off000101c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 10948 bytes
SHA-256: 8c8335bebe0626d0042ec29ac61886921dd0275cfa41f5e52da0fcd925b3f84a

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