Malicious PDF — malware analysis report

Static analysis result for SHA-256 53bcf3d6ee261392…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 03:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa701aeeaf8020e68d1c26358d802ad0 SHA-1: 7763499ff491d15718a7fceb8612a1aac9d908f4 SHA-256: 53bcf3d6ee26139200dcea9575eeeb4aaaea681ea33ac1f0ffeea5c13eca23d9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a 'Pdf.Phishing.Trojan'. Static analysis reveals it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve to distribute further malicious content or lead users to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://envida-nieuws.nl/bsb_website/upload_fck/file/48436076885.pdf In PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/d4f53cefc8a81be2eef98b7a3eccd1fa/wudexevogeseruv.pdfIn PDF document text
    • https://acryl-bg.com/userfiles/file/49667581722.pdfIn PDF document text
    • https://handientu.vn/userfiles/file/26579202983.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/7a008d018ec808a4e4b48dcf57cf78e0/jatotokowara.pdfIn PDF document text
    • https://ancoraeducacion.com/images/92791460210.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/85912694469.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/80a58ee6a0a9a3d15ba652bad5680038/vowurafugu.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/83883685150.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1611d22a635cd9---44122537188.pdfIn PDF document text
    • https://lrdreamteam.com/files/files/file/InfoProduct/file/ligerafimuto.pdfIn PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/98c39b99be796c10b2d1cfa5ae3e38b3/4482541343.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/u2rn30ooh7cm3h9oh5ccl5hfv3/pedajubujaj.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/i38sqjfi6s38gk89evrg6rbe89/67014419809.pdfIn PDF document text
    • https://bibonatura.com/ckfinder/userfiles/files/78686072447.pdfIn PDF document text
    • http://chromavials.com/d/files/10931597122.pdfIn PDF document text
    • http://saokienviet.com/uploads/image/files/41936887643.pdfIn PDF document text
    • http://rosabaum.de/web/editor/files/60669310435.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b89703293---2853749287.pdfIn PDF document text
    • http://bigcool.net/webroot/img/files/ponutupi.pdfIn PDF document text
    • http://securitydirect.it/wp-content/plugins/super-forms/uploads/php/files/035451be23e4a9f173499a4a8f06788d/rikajorokijebugev.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/29550827260.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/wosoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=retentores+sab%C3%B3+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_off0000cb26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB26 10676 bytes
SHA-256: c4086846102ee021f620edca09bc37087d31c4de0aa6ccc3483f490352cc596d
font_01_sfnt_off0000e352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE352 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 16736 bytes
SHA-256: e38bbf7343310081896dd9d0ddfe11f7088fe7987191d0995aea6c622c30f8d7

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