Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae9a74e2a37aa38…

MALICIOUS

PDF

89.7 KB Created: 2021-07-06 01:29:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bee0043935d5f3d5d89ebd6d2fd6792d SHA-1: 151ef43d25862481ee81a62cc1faec31d6f1a925 SHA-256: 9ae9a74e2a37aa3858a02f4173a27abc91665dd62586006a29389bbffdb7b228
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm or phishing lure. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. The primary attack pattern involves redirecting users to potentially harmful external URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/76cu8cksai5e3r0147a6qfqe2t/pawapikoditupobo.pdf In PDF document text
    • http://szyuangang.com/UserFiles/file///83480283783.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee2e94ab43---perufetoso.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/25985777633.pdfIn PDF document text
    • http://ahchala.com/img/file/dolozavizitowik.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/95809467579.pdfIn PDF document text
    • http://boathousebrokerage.com/userfiles/file/fafabawoxigab.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609c3b08bd324---19395892605.pdfIn PDF document text
    • http://specimport.by/files/files/jaderinonox.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/fa2570262ae2c658e586aaf0486830d0/rerofutovifanab.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160dad20b6d329---69206641276.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ccfd01e5c8---sudijusomewuzevo.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/3ace866ff496cd079e76dba5d385f6ac/sopesopuz.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/17113144629.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/51938721085.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/dejujuvatin.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/xejuzevadoviwoxajo.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/51804160007.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609e7fb013ca6---wimavixadunabaduzidozu.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/0d93f5cc2f968922f955a97543e6f1ac/69423368892.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609609cfcf554---10190724665.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/561b9cd21418ab44f2628a7c7351c2e7/90761588180.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=boys+in+the+boat+book+club+questionsPDF 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_off0000f9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D5 17644 bytes
SHA-256: 204e649cb3840c7d44460bd9107b43e64865a4e4f291be5ad4592702816fe07a
font_02_sfnt_off00014033.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14033 10872 bytes
SHA-256: 310b485dce6f9e6a535d3d63660847e01b76898cf5e1198006894e154e7d9b7c

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