Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fbc1e26d2f5303d…

MALICIOUS

PDF

102.0 KB Created: 2021-09-02 21:19:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: cebaf6dd90414fd7603dfc38209eea1d SHA-1: 4e95c9fc182343b1a4f138910d3da2bf115453e4 SHA-256: 9fbc1e26d2f5303d60b84b291ccedd6c02e65ca659e2a4e34d410a27a2009314
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to lead users to malicious content. The presence of these links and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://smidgel.ru/uplcv?utm_term=javascript+pdf+book+2018 PDF link annotation
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/547b695aabda09eef7085f675e4d533a/lemifikikidulukadutopojef.pdfIn PDF document text
    • http://zonwering-belgie.be/ckfinder/userfiles/files/21018136635.pdfIn PDF document text
    • http://datong-travel.tw/upload/ckeditor/files/20210811225637.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/70439879913.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/78089456227.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16076508c9009f---vidalumeroteduti.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/gapubibugezex.pdfIn PDF document text
    • https://trimix.bg/UserFiles/File/xevogitugeturibipizemi.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/15519262291.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/xufolex.pdfIn PDF document text
    • https://fototipia.hu/files/files/3842371298.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/jajak.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/sogukaruredexuv.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/98c4a02d7dc8c337fefbc6b73e8c3b2f/mamosetunidelisu.pdfIn PDF document text
    • https://oilbasaro.com/web/images/ckfinder/files/20210614084403.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085dc342f6bc---27204177822.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec436aa60ed---mewawosokes.pdfIn PDF document text
    • http://jacksonreunion.org/clients/71346/File/nadawomakalafesoz.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16077414ca7d3f---dunap.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/2qctnhhkfkplh74pr057l2nr67/60782775147.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/asoan3c7kb2s01uimkdk88cil7/surusisedoni.pdfIn PDF document text
    • https://anmimar.com/royal/userfiles/file/79042290124.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/9bfuupbch8jn6ungfeb47o3tg8/tedupaxatifezugeruj.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160926ef172896---82048883820.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/30946150397.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_off00012510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12510 11124 bytes
SHA-256: 1e1f61f8e4588b5d79d4cbe3e73c21b75173d54d24c5f7d1321cb96c4d8e6cdb
font_01_sfnt_off00013f06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F06 19448 bytes
SHA-256: 30f3a9deb24173bc0e3287439064368666cfb4c15e62671dc1f2940f441fcfa4
font_02_sfnt_off00017237.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17237 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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