Malicious PDF — malware analysis report

Static analysis result for SHA-256 b84f50f975f267c7…

MALICIOUS

PDF

82.1 KB Created: 2021-09-21 10:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3cd114f7765f7cc1de5aeebd9ab8daa6 SHA-1: 5c117d43d47340d94c37672f6bff8ee4d61f49fe SHA-256: b84f50f975f267c7179f2bf6656dc4fdbf9f342b35fca7ac4cd40e7e74335b3c
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM firings suggests an attempt to obscure the true malicious destination by using disposable hosting and redirectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://ketchas.ru/uplcv?utm_term=application+android+pour+regarder+des+films+en+streaming+gratuit PDF link annotation
    • http://www.jindatunnel.com/up_files/file/wudukasafu.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/lujijexusugiraledosebo.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/xupusijov.pdfIn PDF document text
    • https://asiquim.com/ckfinder/userfiles/files/49555571074.pdfIn PDF document text
    • https://vieclamday.com/userfiles/file/12920006545.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/048f071a5570b030ff6edb3ebd1f0166/puxof.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/15134261267.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161424301d166f---dugevumutulil.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/98335149403.pdfIn PDF document text
    • http://kedehg.com/ckfinder/userfiles/files/2412965577.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/11759430051.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/95805442765.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133b90b1c1e3---ropukilonexaxikate.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/wilixu.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/kepokaj.pdfIn PDF document text
    • http://antropolog.ru/userfiles/file/biwuponuzurosowiduxizavu.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/85050900201.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0830ccb0e---38600776102.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/493003782614313763318d.pdfIn PDF document text
    • http://urotunisia.com/uploads/FCK_files/file/30107148872.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/55206536627.pdfIn PDF document text
    • http://murielbellhomes.com/userfiles/files/lizaxuzifovupovakogeneki.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb11a02f61---pajurit.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_off0000d51c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD51C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED33 11044 bytes
SHA-256: f8d17279939cc929a346d58d7ef5a939017c9acb48b44e3901a1d89d2cc416e7
font_02_sfnt_off000106c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106C1 19644 bytes
SHA-256: fda6d58ccb986cd58c0fb35cfe91558148d808f72913a84b85c6baa594727c97

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