Malicious PDF — malware analysis report

Static analysis result for SHA-256 be0cdc8c4b9b4bee…

MALICIOUS

PDF

79.8 KB Created: 2021-09-04 00:03:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6ccb986778254902c48771e1c6da25d3 SHA-1: 5fb226effce326aace84304085b8922b8907a558 SHA-256: be0cdc8c4b9b4bee0449caed13be63210825da692004f029a06cba3145c1d9fe
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous links to external sites, many of which appear to be compromised WordPress uploads or disposable hosting, suggesting a link farm used for distributing payloads. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic strongly suggests the document is designed to trick users into believing they need a password to access an archive, a common tactic to bypass security filters.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://chcial.ru/uplcv?utm_term=kennwort+pdf+entfernen+online PDF link annotation
    • http://shimamura-mail-order.com/userfiles/file/minoxaxumevinob.pdfIn PDF document text
    • http://clairvoyantinfotech.com/demo/images/56519291426.pdfIn PDF document text
    • http://xn--80aafbkbafwdti1ahihccrg.xn--p1ai/pict/file/36369367898.pdfIn PDF document text
    • https://castilloexterior.net/ckfinder/userfiles/files/wibesugebafupizawirakuw.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/8cos34fa6ft5bblqkbssdorr9s/vujorevububixikugomirodo.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/810f00460295ab90f50cc5cd1e2bc6d8/rabamerukadurukef.pdfIn PDF document text
    • http://jtour.vn/userfiles/file/64779348634.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/8f60285cf2f84862a6726c879296f3da/venotorunaxosogu.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609975f83379c---fojejufuzal.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/33268295518.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/wofikamotuzapomime.pdfIn PDF document text
    • http://pvsystreports.com/wp-content/plugins/super-forms/uploads/php/files/ptlr0riphlusg1bsn5ld203pv2/fifijajibawafizewaf.pdfIn PDF document text
    • https://jennysbooks.com/wp-content/plugins/super-forms/uploads/php/files/7d211ce539937b9462e58c71b6c481c8/89826447826.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098c8c85faf6---janemivu.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096e2cdc42ed---12544281249.pdfIn PDF document text
    • http://wamer.org/userfiles/file/35263511343.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/8af5370310bad4c717c6e6c383df190c/detopoporimanolurugugek.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609c89a4d4973---xedutufojikazagivugubiwal.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/zuxagaxejabebibina.pdfIn PDF document text
    • http://tinhdauvietnam.vn/upload/files/miraborazisinofifu.pdfIn PDF document text
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f551471e6b8---pabivogunivazag.pdfIn PDF document text
    • http://www.thaiticketmajor.com/static/imgUpload/files/dekosu.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_off0000d428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD428 18432 bytes
SHA-256: a64e74ef0d51cf1e90f6e143a4cca815ed1afc782babab61ebc2905e5ae196c3
font_01_sfnt_off000102f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F0 10240 bytes
SHA-256: 4202054a43055ce13ccb7c38014159a61fe5775fdffd47f815303a203d5df29a
font_02_sfnt_off00011a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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