Malicious PDF — malware analysis report

Static analysis result for SHA-256 55cbb86737a4c364…

MALICIOUS

PDF

142.0 KB Created: 2021-09-03 19:31:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f85199bb4bcff132936d88fb908be0d4 SHA-1: 2caa8a18c4bbd7b997c35a4049d8719980ca9726 SHA-256: 55cbb86737a4c364640d82dbe27f2ceb32a635c7cff17652b112423825011df6
196 Risk Score

Malware Insights

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

This PDF document was flagged by ClamAV as a phishing trojan. It contains numerous links to potentially compromised WordPress sites and other disposable hosting, suggesting it is part of a link farm designed to redirect users. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content likely prompts the user to install a browser extension or update, a common social-engineering technique to facilitate malware installation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9913

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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 http://expresskaliski.info/file/lujimuwavoxuro.pdf In PDF document text
    • http://yangpupark.com/uploadfile/files/xumoguse.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1609675c6d7cbb---22888583631.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1816295421---zaputaxipunijobodutus.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160916d4802136---5958592506.pdfIn PDF document text
    • https://begili.com/uploads/image/files/manavawog.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c18d66dd3de---luvedasazudewojuzax.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/talitajetefisor.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609afe0e719d6---27674870944.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/69540833012.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//70006911885.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210824_BBC66B51E1F8DA6F.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/39300512044.pdfIn PDF document text
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/214e984e46286c80178309168d757514/siwosesu.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091e65e172b4---pefuremegewedegefetukal.pdfIn PDF document text
    • http://mav-auto.ru/images/file/69398605781.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/b8dcdcbe95682c8c1bb20163b524b02f/53146305633.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/da4b7c5123320c8abc0c1527c912ffd6/23838715775.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/37328ef9085d7f043c33961197fdd7a4/26866566657.pdfIn PDF document text
    • http://proxima-design.cz/files/file/58724019112.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5248acf7d---misiludojemefesikenijujav.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/83572885671.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098a059bd7e6---fobugabiwulabogibep.pdfIn PDF document text
    • http://sjhtractor.com/d/files/42086936491.pdfIn PDF document text
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/17600979333.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=descargar+interchange+1+fourth+edition+teacher%27s+book+pdfPDF 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_off0001c133.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C133 11272 bytes
SHA-256: 4cdaa297832e8ff8a9f9bb27d6c02ed8966f13a7de3a1ae47340bbe9cd1bfc97
font_01_sfnt_off0001db49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DB49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001f35b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F35B 20760 bytes
SHA-256: a07ea0682965b0c7053bbab8dd23e4c53e2cb1d9cd1ce9c82620251cd3b09bed

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