Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bfbc60a34d5dbce…

MALICIOUS

PDF

85.5 KB Created: 2021-09-18 07:05:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: cbb17a1b979268978ca368e504df5597 SHA-1: 0a547fee7d7a0e736f5ba5ee6c92a50094affab6 SHA-256: 8bfbc60a34d5dbce3ea629c7432460e6f85f148b4cc90f254c1f91a004a7999e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a link farm hosted on multiple domains, including compromised CMS uploads and disposable hosting, designed to redirect users to download software. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://balone.net/_upload/file///81225175522.pdf In PDF document text
    • http://smingames.com/ckfinder/files/16799994757.pdfIn PDF document text
    • http://gyermekhaz.hu/Content/site_images/files/58193556060.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/redinigofapumujes.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/verofapazexafo.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zirovuxesetexukowa.pdfIn PDF document text
    • https://mirrorlink.com/public/files/files/kavasavifoxejaxujon.pdfIn PDF document text
    • http://studiotecnicoarduini.eu/userfiles/files/vunesodakovuva.pdfIn PDF document text
    • http://zaiger.ru/img/file/95869370462.pdfIn PDF document text
    • http://travelsi.ru/ckfinder/userfiles/files/gizozab.pdfIn PDF document text
    • http://stellarvvv.ru/ckfinder/userfiles/files/2850627971.pdfIn PDF document text
    • https://bike-accessories.supersites.gr/content/ckfinder/files/jakitilal.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/lutisil.pdfIn PDF document text
    • https://atlaskvartir.ua/data/uploads/files/69942545949.pdfIn PDF document text
    • http://cjmfgxfollow.morefriendship.com/upload/files/72814555658.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c974dfc86---kurotorojujipubasebifi.pdfIn PDF document text
    • https://fitness-sport.it/userfiles/file/fupafavojawuzixok.pdfIn PDF document text
    • http://agendatourvietnam.com/hinhanh/file/wipuridogaworibisifo.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161424566c9fe9---tikajozajamugurasejususo.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/9307cd.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/93548231435.pdfIn PDF document text
    • http://sfipl.in/userfiles/file/78971733508.pdfIn PDF document text
    • http://xn----0tbbbfo0f.xn--p1ai/userfiles/file/26257059043.pdfIn PDF document text
    • https://onderdurdu.com/upload/ckfinder/files/95377200392.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/ff6d92a1566f3417b8b181af4614a1f3/72513752687.pdfIn PDF document text
    • http://arcadia-fitness.es/userfiles/file/radetufatoximoduliw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=camscanner+apk+download+for+android+old+versionPDF 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_off0000eb46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB46 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001035d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1035D 10956 bytes
SHA-256: 83bcb3d9d41266f605ab0c31e41e7034254f2a12a1e2e7b1619550d1dcafc159
font_02_sfnt_off00011cc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC5 16784 bytes
SHA-256: 8a79e3fbacff1fa3f015548d1c8f715e2eecaf5060dd1386e5618c56a4bb045a

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