Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ca46dbad624969a…

MALICIOUS

PDF

83.9 KB Created: 2021-09-05 22:05:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: ee0b91c25ef40758743f8689e62d1fd0 SHA-1: 96084372264c45102a76b619767fe7a985631fe7 SHA-256: 5ca46dbad624969a2b1c6dfe7c2bea30cb61b51358628dd03e70a5460b8b47a1
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of embedded URLs, many of which point to potentially compromised websites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary purpose appears to be redirecting users to other malicious PDFs, likely as part of a link farm or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://dailyliving.nl/ckfinder/userfiles/files/kuronejofaro.pdf In PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/03ec50e83445dd10250c58d044940e05/dofanejenanegujunekedojub.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/1758533130609b43bbb6a4e.pdfIn PDF document text
    • https://rotterdampools.com/contents//files/nibimewo.pdfIn PDF document text
    • https://roweryelectra.eu/app/webroot/uploads/file/16216106893165.pdfIn PDF document text
    • https://jjpremiers.com/files/58618427213.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/23ad21a1f2ad71773491eae08b094380/23060337376.pdfIn PDF document text
    • http://chromowane.com/userfiles/file/64992879997.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607981942ade7---kijixadixivuwodupisevo.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/1611c198929dd2---xopadozilotomejupikuziwo.pdfIn PDF document text
    • http://coral-travel66.ru/admin/ckfinder/userfiles/files/19307372824.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607e244ba2515---75970149667.pdfIn PDF document text
    • http://clinicaveterinariailmarzocco.it/userfiles/files/14627090529.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/59920493035.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/wimaxagefegevitesezurat.pdfIn PDF document text
    • http://bbhshipyard.com/userfiles/file/61882264590.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8pi3roftscb226lplaj3453p57/77155384722.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/173705004360cb1cc368fd8.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/basamoxazoweginetadeweped.pdfIn PDF document text
    • https://salvatoredivilio.it/userfiles/file/50330044984.pdfIn PDF document text
    • http://www.facyt.com.ar/ckfinder/userfiles/files/65446004170.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/75131930245.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=vox+machina+origins+series+2+pdfPDF 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_off0000df99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF99 18672 bytes
SHA-256: 6421cc8be27d3fde2736ea70763998179e0d3f2c7119e8e08e70979baa0aea83
font_01_sfnt_off00010fe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE9 11112 bytes
SHA-256: 6a50cfcf28c04851ff530334003d83e4ec081cd943aa9deb242e8d7ca248414a
font_02_sfnt_off00012986.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12986 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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