Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c4cad566681c4e…

MALICIOUS

PDF

71.8 KB Created: 2021-09-04 12:51:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 00599bab5c93189c1827d11eb52fec0b SHA-1: 398142e2ae78403a0bc5e773c20840707f125685 SHA-256: c9c4cad566681c4ed83178a9160ad6180440a869c5c2cc1ce37744c062f42605
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous websites, many of which are hosted on compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The primary function appears to be redirecting users through a series of links, potentially to a malicious payload or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://tremonttemplemacon.com/clients/862779/File/zefefamosoxadon.pdf In PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/xobubesitumofideleve.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/52815159524.pdfIn PDF document text
    • http://puginternational.com/ckfinder/userfiles/files/88766966786.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/wulifo.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16071f00544c6e---wojawapapekenirisixupamen.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/79b537490c7a75ba18cdcf0e682c8d09/76755241505.pdfIn PDF document text
    • https://oxfordjsr.com/userfiles/file/lunukulakuzipivibiwutaxi.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607386127d3be---bosugegejekaxaxen.pdfIn PDF document text
    • http://www.drivingschool-brno.cz/files/files/zelesavufabukoxa.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/93786038676.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/29870793694.pdfIn PDF document text
    • http://kassa.pl/userfiles/file/katunilamanuxofego.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/9f2dbc09cf39dc5bbd8243d546f4c121/bipulenejedidajilefu.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba972743950---90195364246.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e84acd198---wuxuwuzug.pdfIn PDF document text
    • http://naturallymine-chicago.com/clients/867610/File/14202897637.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47416861734.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/bumosamerorubexe.pdfIn PDF document text
    • https://renault-service.com/userfiles/76055909198.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160781e8a11161---99868301548.pdfIn PDF document text
    • http://asremajazi.com/uploads/files/12185595445.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/4216281423.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/kewepebedaxiligek.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/da958201df7a770fb19f9f4d13146695/74958409604.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607247df71627---80008202432.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=jeffrey+archer+best+kept+secret+pdf+free+downloadPDF 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_off0000b6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6DA 11048 bytes
SHA-256: 652ab3d59e4740cdc75f11a7ee9a7499f86322cb161481be9473ee71cdd241d2
font_01_sfnt_off0000d074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD074 16100 bytes
SHA-256: 23ba0641ae266f2c8b6bae24056e1acb9603f7637613ad9ba79f3f1533fcb78f
font_02_sfnt_off0000f956.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF956 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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