Malicious PDF — malware analysis report

Static analysis result for SHA-256 99bc0732864611c5…

MALICIOUS

PDF

75.9 KB Created: 2021-09-21 20:22:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: efd9bbf396c53513577f1065111b35f9 SHA-1: 5e04b79c2e6f5db78f7c0e44f2e98cc0e0e4476f SHA-256: 99bc0732864611c5adbd22b4223cacb4499c886ca10008adf9eb0e71f5708707
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=aplikasi+cheater+free+fire+headshot PDF link annotation
    • https://jhservice.net/imagenes/galeria/files/gimuzesaninazura.pdfIn PDF document text
    • http://lnv-cnc.com/userfiles/file/97524344203.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccfa32f6af---vonelowemo.pdfIn PDF document text
    • http://www.radio-kum.si/data/files/bedaxosowazilavedelufaw.pdfIn PDF document text
    • http://amandamaitland.com/images/file/83378903709.pdfIn PDF document text
    • http://kxqcgs.net/filespath/files/20210920215729.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/fanogonovatixalufotine.pdfIn PDF document text
    • https://suruburi.net/mm/file/38957770392.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142192db17c3---88215899941.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/91161279175.pdfIn PDF document text
    • http://odesignlab.ru/admin/ckfinder/userfiles/files/75842874239.pdfIn PDF document text
    • http://avtokit116.ru/!upload/files/27193768470.pdfIn PDF document text
    • https://marblo.marblobaths.ph/app/webroot/img/files/55269591963.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/e787b3e593da409628273e8a828178ce/321510780.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161407e39ae9bc---damijeti.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16146abcc8d9e4---26795521501.pdfIn PDF document text
    • http://vodova51-53.cz/files/13991749827.pdfIn PDF document text
    • http://mathrainbow.com/userfiles/file/xejanudizodemekulaw.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/66277031432.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/dndl1j62qjb85q8nob0rfr15o4/44008323069.pdfIn PDF document text
    • http://mientaytourist.com/uploads/files/dewiwidolumuko.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/vuxixosemonunuvurudi.pdfIn PDF document text
    • https://groupunsur2.com/contents/files/dojerijilirirepit.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_off0000c422.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC422 17392 bytes
SHA-256: fd18c19f8b2a5ce95df1d86ab0bf2000e7dd2629a8940315162d07e7bfa3df02
font_01_sfnt_off0000f170.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF170 10684 bytes
SHA-256: 1124cacf542f8036ff7e532248da3f3a20095e094011ccaf92588d4fc60d169c
font_02_sfnt_off00010a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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