Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed21447a33351f8…

MALICIOUS

PDF

94.9 KB Created: 2021-10-10 13:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 0d8dcc158b15de5351e9321f7d51f31d SHA-1: eeca72a69e3a8ce3c50aa6b015bf7cfa584fc7dd SHA-256: 8ed21447a33351f8a7c27e7c59d944c371b98808744d9f3a8a1be393abc98a49
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://nomylo.ru/uplcv?utm_term=accounting+quiz+and+answers PDF link annotation
    • http://clair-environnement.eu/catalogue_dynamique/file/23025893382.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130c4104a4a9---78600624400.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16150f4f7abcd6---mudixakegutukanofenuwuj.pdfIn PDF document text
    • http://cmcthailand.com/ckfinder/userfiles/files/97598965792.pdfIn PDF document text
    • http://e-junghan.com/userData/board/file/nukokojozegepex.pdfIn PDF document text
    • http://rotarytattoomachine.co/project-new/christianbook/upload_images/file/91802177311.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/xokewikasun.pdfIn PDF document text
    • https://tipresentoio.it/images/file/visawozig.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/julazokiwatakusoligok.pdfIn PDF document text
    • http://kondicionery-pushkino.ru/upload_picture/file/64168301944.pdfIn PDF document text
    • http://vongtaygiay.net/media/ftp/file/gixojikonezozeg.pdfIn PDF document text
    • https://nevjegyzek.eu/uploads/file/safebudumepudivamipa.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pagesulukorusubalu.pdfIn PDF document text
    • https://thanaclusterwestgate.leaddeehub.com/userfiles/files/teluxikajigapifofupiben.pdfIn PDF document text
    • http://zit-tech.com/userfiles/files/sitelo.pdfIn PDF document text
    • http://ubytovna-krumlov.cz/userfiles/file/rirepesudeg.pdfIn PDF document text
    • https://alaskaproauto.net/nbloom/fckuploads/file/72177513127.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e4d2855005---xusuxebiladibuvukugex.pdfIn PDF document text
    • http://mytrangroup.com/uploads/userfiles/file/pisotoxewikugagozotux.pdfIn PDF document text
    • http://seoulgreeter.com/userData/board/file/kufuso.pdfIn PDF document text
    • http://studiotecnicodama.it/userfiles/files/nixavevilap.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/73182234658.pdfIn PDF document text
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/cu7ug8526jueoiocdq0v9bjmph/puwisumelefibuwoxagiw.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_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 10872 bytes
SHA-256: fe586f7c06a2e0ecb3645a9b376742b545dd46ecfb52f0d19170f07a074dfac7
font_01_sfnt_off000124c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124C3 18840 bytes
SHA-256: a154496dec26e89c9f5a1670cd3f87ff4e4c7a5552e390937b053bd3e6f21007
font_02_sfnt_off00015662.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15662 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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