Malicious PDF — malware analysis report

Static analysis result for SHA-256 62520a2ec93bd43a…

MALICIOUS

PDF

88.9 KB Created: 2021-08-11 22:51:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 59f1aa961887092bd76e55a8b6679264 SHA-1: 98d1795de040a079a0749e5a2151e30ee822ced9 SHA-256: 62520a2ec93bd43a910c53d890ab509e83122c83ea87e26e538e9d901dc5eb94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ketchas.ru/uplcv?utm_term=what+to+expect+in+a+pre+employment+medical+exam PDF link annotation
    • http://bachtungcompany.com/upload/files/zusitizozuzujeweke.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/24419084710.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/m36048nach2pv7ehvosnqrcu10/94261808310.pdfIn PDF document text
    • http://fine-trading-knotwork.com/uploads/media/zobinevira.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/9a2d4d00bf168d05124a7736aabdd2aa/lutasifutabemogavula.pdfIn PDF document text
    • http://bluestandard.pl/ckfinder/userfiles/files/31669832001.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16080f7eb8855e---zobusudiv.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608663eab78f0---80120060712.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe997c9524---logosavupozirajodidunol.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/48866605825.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/femexulufedaboworopi.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/kiwativag.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/28805340098.pdfIn PDF document text
    • http://aj-logistics.com/stock/userfiles/file/wadiwafopipimigom.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/retudulametuwinod.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/bf22683be20534007d34b24224ad9e5f/59005810272.pdfIn PDF document text
    • http://suamayin.biz/userfiles/file/bufibabugifinotaxesatigez.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/17788db15a59e4b0023ddc803031dd35/wixumujezut.pdfIn PDF document text
    • http://abwferrellpkwy.com/uploads/files/58241505287.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/80245277038.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/81290f9f96045bc9871dede8f704dcab/vemosuwo.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/nozipasakidik.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_off0000f631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF631 17420 bytes
SHA-256: fa153c5b3ab08d3e0024a9269be342cc84dc0b5059ebae4cb0381b5487fd6e00
font_01_sfnt_off000123cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123CF 10820 bytes
SHA-256: b13a20699653c07bab2ac858386663ef983422681710b56e224c153df12e3bc9
font_02_sfnt_off00013ca1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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