Malicious PDF — malware analysis report

Static analysis result for SHA-256 3733aa1b04bed9e2…

MALICIOUS

PDF

91.0 KB Created: 2021-07-02 02:15:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: aa2ca533dda610af5ee22e9a09f3017e SHA-1: 3e627a9628349149748ecd6fa47ed21fc7ec5e82 SHA-256: 3733aa1b04bed9e2a524fa9998d5ae1aa53e4d292d6d3b89c748d2de5e4901a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites. The presence of 'SE_LOLBIN_RUN_COMMAND' suggests potential execution of commands, although no specific script was extracted to confirm this. The overall pattern indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/248be4a311176cf1451e7db3f181f289/xubaroluvana.pdf In PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/q4jk36cnvi5kgmm37nsafsaen1/61458770789.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/ef01e81dcd4d52a29712440339b776dc/kapoxejajumizolumoxolori.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/edjvkcmdulep892drvasrb07s7/16789513106.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vb453g0h2rgbcabd3fb6qhmn08/vuledef.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/8718171787.pdfIn macro / runtime command snippet
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e1ba760587---dufexaxu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607ac518f1ffe---76416067677.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/5b52f4271425f2dd35e271ff183322fc/davotugemumirere.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/eb5d4a696d6a624aa411bd20830bb764/58000987008.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f86ebb30e9---sojukabatupapekunekagoni.pdfIn PDF document text
    • https://cls-toronto.com/wp-content/plugins/super-forms/uploads/php/files/4bbdabf6f3f0fa53a95ade20a4c9e1d9/sikikawematineja.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/d69f0ae3bb4c52d8badd4ef7d7cb1c2d/80901709219.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/melebilorodekatu.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c4vi39m9agbgqb264dm597vkl2/xasexifowifopopiki.pdfIn PDF document text
    • http://autoshiftbid.com/fckeditor/userfiles/file/lanaravatakerumokibori.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16070d1c960467---23295401304.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/acca406fc477199c20a5fa8091b15d21/46773075515.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/81321085625.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/bc5utcl5hnb2c74p05pm8urvco/gizefatabepaxosofelup.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a613de441c4---96183317590.pdfIn PDF document text
    • https://twr1115.net/files/fckeditor/file/jetotodakaritijusir.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607a796f2c30c---rezuvesusugizapemoluda.pdfIn PDF document text
    • https://akdenizokullarIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=baby+horse+called+foalPDF link annotation
    • 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_off000101f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011a07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 10584 bytes
SHA-256: 3a9c3d990906dc825a76f123de812bb287b41f864434ececea64ed044a8c15a9
font_02_sfnt_off00013263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13263 17100 bytes
SHA-256: d7aaa2e3f348c66893993ec150c23175834da01f50131d3cd7a7552d1ba3d858

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