Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ee39275d51c7600…

MALICIOUS

PDF

80.9 KB Created: 2021-08-14 22:19:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e359d8039b7592f233b050126b73e21f SHA-1: 2d787c39848383082087c7e693b58d558b9233d4 SHA-256: 1ee39275d51c7600c55994c2078f947e500c1190b24c716a24c6dce3b2d181b2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains a large number of embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to phishing or malware download pages. The presence of numerous external URIs and a link farm heuristic strongly supports a phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://krisoc.ru/uplcv?utm_term=ejercicios+de+factores+de+conversi%C3%B3n+2+eso+con+soluciones PDF link annotation
    • http://bulgankhangai.mn/userfiles/files/36040365207.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a697c9ced7e---juzuluxodol.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/xasepawofop.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080e3d6a1cf8---folowiwonofimasijakuvek.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/k54imuj4nnrr6deqb7h088e552/tupinaruzojirikozebuti.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/sokitanikavijiradukular.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607077c15ad7b---32894025897.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160b48da52d3cd---57735401977.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/e6bv9g6ttdt6r9ulbj6i20ffl4/93180375594.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b051c18d908---74201441537.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/ginetobadazixupazapona.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdb177a7323---68685788617.pdfIn PDF document text
    • https://prsnashville.com/wp-content/plugins/super-forms/uploads/php/files/d808673b5f8f0744b8bef7271b246f2c/47081000761.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/limibuvuv.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/9tkoellrhaegkr3shu81sb4b21/tijolukofekina.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/420fa05123293fd2112f3149ddcf1d52/tekumumotoxinufezilamada.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/37833940961.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/44fe2a2ce7711815aa873488d735d275/zujifaw.pdfIn PDF document text
    • http://koyomisushi.com/uploads/files/zapit.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/94ujf9ohtccenb851fkk313u8h/10891743076.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/gixod.pdfIn PDF document text
    • http://ambulatorioveterinarioilprato.eu/userfiles/files/16599998452.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/pezutitowoniw.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607add45bcac4---janupafazunakarizofafoba.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_off0000d09c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD09C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B3 11008 bytes
SHA-256: e5c7f44d84b4c6e73bcc436228b0c9d851380e33f75a04b938ad9603424abf22
font_02_sfnt_off0001022d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 19252 bytes
SHA-256: fa865cd996fe097b9421dc2c548ced893552b79b776f23cee91c94bce39198b1

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