Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b84df9f9bc59a5b…

MALICIOUS

PDF

129.8 KB Created: 2021-06-20 15:47:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 14e238421fcb49de70ca92ae77d1890b SHA-1: 0eb1a6af7f109c108d6cb09e93502126c23abc57 SHA-256: 4b84df9f9bc59a5b36c284b49a2888407e43521ed929a83ad39b6d7db4c6dee3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is often used to redirect users to malicious websites. The heuristics indicate it functions as a link farm, pointing to multiple compromised domains and disposable hosting, likely for phishing or malware distribution. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://garglob.ru/uplcv?utm_term=covert+narcissist+deutsch PDF link annotation
    • https://al-farh-iq.com/upload/userfiles/file/donegiwelamikevo.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/62a10b7ff285706ef7d740282db9d394/nejusexanibesaram.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/wejivuwonubutekepumit.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210613040742857362wz4epb.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/14al8mhqhmde1kd4cjtd9gofm0/xevajopowowimawe.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/9506232495.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/440bf6480036eedc0bf7547fe4f3c9d1/dabatitusoxepoxinexu.pdfIn PDF document text
    • http://benevolo.it/userfiles/files/makedesusejubewep.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/gutogovipubidugi.pdfIn PDF document text
    • https://mayurherbal.com/userfiles/file/35034775771.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160789631e4489---mugura.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cceea254c6---liginupotugisij.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf90265c259---vugire.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/fifaxajitejezob.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B589 4960 bytes
SHA-256: a5acc1a83fc604e547ca517eaf3b4940529f9fa70a3f2927c02e3bbbe001ec5d
font_01_sfnt_off0001c65c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C65C 16264 bytes
SHA-256: 84543549c1787f374a3c82bdab63cba7ea9033e810c23c01b95f8c623ce9c1b8

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