Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cc5a5267e76ab1…

MALICIOUS

PDF

81.1 KB Created: 2021-09-20 15:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cfb0a7e96e14ebd609e05864a727aaf4 SHA-1: 8776dbe08c0a19d891e834e0049da6f1b94ca941 SHA-256: e8cc5a5267e76ab17e12ccbb6ea1b08a02c6b48fd49cf680159ad5fcd814dfdf
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://huntic.ru/uplcv?utm_term=pokemon+diamond+cheats+without+action+replay PDF link annotation
    • https://gilbertems.com/videos/file/2231300816.pdfIn PDF document text
    • http://sswjeans.com/files/83196497937.pdfIn PDF document text
    • http://tecsun-moscow.ru/docs/file/setivimoronefiwolezule.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/setonewojoxajer.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/duximimikimuvew.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/02d6577b2a7d70357bddd16ec37ddf1c/tojuzizoluxusekokalaf.pdfIn PDF document text
    • http://thietbikhachsanvinhhung1.com/upload/files/47142284868.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///babaverefit.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139dccd778be---xakifalivuwitowupurazu.pdfIn PDF document text
    • https://xulynuocphangiathinh.vn/images/pic/file/junuvefonapomupisa.pdfIn PDF document text
    • http://tianfonmm.com/d/files/dapumefaxevapin.pdfIn PDF document text
    • http://niszczeniewaw.pl/userfiles/file/puludipupisoremonuguki.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/75108455924.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/romerofegeborapufadinogu.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/31990597327.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/popubitarifomanirazimav.pdfIn PDF document text
    • http://mylodge-naoshima.com/foxaludagobu.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/22531538679.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16137b19ddd002---medivuxawofibuti.pdfIn PDF document text
    • https://ubk-sad.de/azubi/userfiles/files/75674354324.pdfIn PDF document text
    • http://xn--h49al71atridzo.com/userData/board/file/fakemuroti.pdfIn PDF document text
    • http://alptw.com/images/files/2401170792.pdfIn PDF document text
    • http://rocincorporated.com/domain.com/images/dynamic_pages/file/jidijixaguxobanam.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/45076495134.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/122db2bcfc1d1f999e49aae6c5fbfd75/fifelibibirir.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_off0000d612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD612 17864 bytes
SHA-256: 12027c710463e25c8c665115ac247a884a69edf637b8dd1e74d8953459473ad3
font_01_sfnt_off000104d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104D7 11172 bytes
SHA-256: aee70ad6655846fe63f2b59ca23b8c9a2bfaad61230faf168c6665227ac63057
font_02_sfnt_off00011ed9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ED9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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