Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9df430bb27a6e7f…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 21:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8aac221a82cda8b1421396d0a64b479d SHA-1: 2778ad6f9a18362343e406caba8c020364cfa7e2 SHA-256: b9df430bb27a6e7f1703e201f979b5f53bf77abaa3cda52f5135c50eec9a4106
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is likely used to redirect the user to external URLs. Many of these URLs point to compromised WordPress sites or disposable hosting, suggesting a phishing or malware distribution scheme. The presence of JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 7

  • 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.
  • 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 http://gulfcoastlist.com/userfiles/file/kinukitesimibigexesalu.pdf In PDF document text
    • http://luyenthidhcanhsat.com/Images_upload/files/34587913066.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/161441cb15f6b3---29025757370.pdfIn PDF document text
    • http://119pump.net/d/files/84784055037.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/tufudutoruliwadawu.pdfIn PDF document text
    • http://nincity.de/inline/file/vupawetok.pdfIn PDF document text
    • https://mraos.com/web/userfiles/file/kegasoweluk.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/9e349e57e6be595fc78991e2e229f2ff/fatasubegudokome.pdfIn PDF document text
    • http://s-privod.ru/userfiles/file/52681699073.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/luditoponuf.pdfIn PDF document text
    • http://studioindelicato.com/userfiles/files/3801041226.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/46037708988.pdfIn PDF document text
    • http://thibangoto.com/app/webroot/uploads/files/gatalozaloripen.pdfIn PDF document text
    • http://phutungvespaco.com/luutru/files/89667055541.pdfIn PDF document text
    • http://wahluenfty.com/userfiles/bisowipenomewokedu.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/xuxosaxutuvunidogen.pdfIn PDF document text
    • https://madspot.dk/ckfinder/userfiles/files/54990980877.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361dcc3687c---82969488353.pdfIn PDF document text
    • http://salamino.pl/userfiles/file/3988823022.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/puzilaf.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/vubetudef.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/96193518967.pdfIn PDF document text
    • https://www.wroclawmodelshow.pl/ckfinder/userfiles/files/63004214907.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/87707260032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=ghd+sports+for+smart+tvPDF link annotation
    • 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_off0000dc61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC61 17432 bytes
SHA-256: 7d0b9d95f30e7f294456d1c1d15971cb60f5dc61a77487299bd743fbcd267628
font_01_sfnt_off00010988.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10988 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001219f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1219F 10496 bytes
SHA-256: 4621b5439d272aa104a60fc69080a84b5809444fa5e9030da8e20c5d144e9012

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