Malicious PDF — malware analysis report

Static analysis result for SHA-256 93662912deca8332…

MALICIOUS

PDF

69.9 KB Created: 2021-09-18 09:18:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 7ac82444ec6c0702ac5f8c47e6b42cb8 SHA-1: 596e9b302df85f4b4aaed1606685cb8fe4349868 SHA-256: 93662912deca83320887141674344f281328b7b2a53c9087e2514335201e9de5
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URLs, many of which are hosted on compromised CMS uploads or disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://catamma.ru/uplcv?utm_term=support+for+this+video+codec+is+missing+mx+player PDF link annotation
    • http://www.brickchamber.com/ckfinder/userfiles/files/sujulagoxapejido.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/83506955142.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/didatewewojunewater.pdfIn PDF document text
    • https://goodline.by/userfiles/file/golulawivim.pdfIn PDF document text
    • http://m-styleauto.com/js/upload/files/60795201137.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/9035573228.pdfIn PDF document text
    • http://monterroso-construpuntos.com/campannas/file/30703983531.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/71708131292.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/1613e478bd2541---11901171728.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/kenisudutukusofoje.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f288d6fbeb74b3a09ce8869d7547c75d/45925877410.pdfIn PDF document text
    • http://drironcat.com/images/file/filasumedudezexiwob.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/parugofazaruxivosulazo.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e0853885b---towupi.pdfIn PDF document text
    • http://mcutech.net/upload/2021/09/file/16312965321892461498.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/33633836660.pdfIn PDF document text
    • http://tainanrup.longi.tw/uploadfiles/files/20210917_081756_1171.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/59c3977587b8b498a4af9702311a929e/nanifaja.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109060050361393.pdfIn PDF document text
    • http://gianphoiduyloimodel.com/Images_upload/files/fewatit.pdfIn PDF document text
    • http://innospectrum.eu/hirlevel/file/57230792160.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614435de0a6d5---18879567823.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_off0000ae48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE48 15860 bytes
SHA-256: 4d340ca0a8d1b1bd33ed717f207650aa742ec92e83212682b9cd6ad8ba72e6dc
font_01_sfnt_off0000d6d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6D9 11524 bytes
SHA-256: 3199b688e3efab8b28deb8f669871272a9adc497ac47d42b4713cc3c8a268124
font_02_sfnt_off0000f1d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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