Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cb9c20569c6a6bf…

MALICIOUS

PDF

95.7 KB Created: 2021-09-05 15:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3ca5f90b5fd86ef30bd18255fddc8f8d SHA-1: 4754240d22bde60bc0213645a6f544d06af67218 SHA-256: 9cb9c20569c6a6bfb46b927a70bff3fe3bf8c8e564b824192cd0c86e64f98093
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting a link farm or phishing lure. The PDF structure and embedded content are consistent with attempts to redirect users to external malicious sites, likely for credential harvesting or further malware delivery.

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://infrive.ru/uplcv?utm_term=u+s+245+of+the+income+tax+act+1961.pdf PDF link annotation
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/paratipujukebaxatobesuxew.pdfIn PDF document text
    • http://gleneaglehoa.org/images/file/fubor.pdfIn PDF document text
    • https://www.elitelawnsolutions.co.uk/wp-content/plugins/super-forms/uploads/php/files/tscajksj565ab1p4651vtaq4ov/walumadotosodogavinewoxe.pdfIn PDF document text
    • http://kstarsmall.net/userfiles/file///18204299493.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/ef4956c197b778cbcc13a85a69828e06/vodiwobaw.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/25808213753.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/nunon.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/86456571236.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/79348711684.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/911942d6d3fa44deef82891c53057c1f/xuvusilareragifexu.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/visokapusalelut.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745d34475e6---xukekabeliloretiv.pdfIn PDF document text
    • http://perfekttorun.pl/pliki/51625125705.pdfIn PDF document text
    • http://debnine.net/UserFiles/File/71875513489.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75acedb2eb---37614554666.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/9c12f43a776f3f4e529498e42bd18123/nevenafef.pdfIn PDF document text
    • https://wrd13.com/force/file/ditobuxazusuteluwoz.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/63045946559.pdfIn PDF document text
    • https://jajugroup.com/ckfinder/userfiles/files/vedifiku.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/90388750840.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/zesefebirovolumuwu.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/74663509132.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_off00010c60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C60 18804 bytes
SHA-256: 31a0158ffcbf256cda589c3cbcbbf707ad433b691e97f4d7af7e5aff8a29e284
font_01_sfnt_off00013dd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DD5 11636 bytes
SHA-256: adf190db0312eb6bc0bd3307a4326823c55ea0315e23f1fb167fe79337061aa6
font_02_sfnt_off00015974.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15974 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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