Malicious PDF — malware analysis report

Static analysis result for SHA-256 30d5f4463ad407fa…

MALICIOUS

PDF

83.6 KB Created: 2021-09-06 06:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fd58e4a9ff1479c10954d926561dea42 SHA-1: 4ef21f809d01cbf84d88a95f0f48828d658d3762 SHA-256: 30d5f4463ad407fac9c8db58bb356cf09038e636b86052bb53e409e61136b015
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads, suggesting an attempt to distribute malicious content or phish users. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports the link farm and SEO poisoning attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sochi-polyana.com/ckfinder/userfiles/files/puwitezevu.pdf In PDF document text
    • http://aelma.com/sites/default/userfiles/file/mameduguloz.pdfIn PDF document text
    • http://chipublichouse.com/ckfinder/userfiles/files/tozumukevuruda.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/dufuwo.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612c4cc11ad76---dudedenanofawuperoxu.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/funekip.pdfIn PDF document text
    • http://duquenne-moteurs.fr/webroot/upload/files/69486704791.pdfIn PDF document text
    • http://www.toptehnik.si/images/86313972590.pdfIn PDF document text
    • https://www.arc-welding.co.uk/wp-content/plugins/super-forms/uploads/php/files/6vopniq30h1fugar012tscusti/92687106845.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/ec5e43147edeb8ecc8de76e7dc7d8abc/12550552671.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/2db0486711a49634fee264292e34d73c/luvuxidib.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/38872213505.pdfIn PDF document text
    • http://ferramentabelleggia.it/public/file/3573931608.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/joxufuteke.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/20dfb6ecc8c320da17ccdc79ca88c523/35136532307.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/2as1r5djk2esgm9tovlffrvc32/joziregar.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160863a7c7ebaa---videvamosaso.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b7ea05f5cd9e7c13afc889aa0f608fd5/16320680338.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/f713peupd4d62nkkn8fh9293n5/fifinazatadoxut.pdfIn PDF document text
    • http://daphongthuyhueminh.com/uploads/image/files/72365492557.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/37450248828.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/88878718146.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/27008121005.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=ms+excel+shortcut+keys+pdf+2010PDF link annotation
    • http://irodori.kir.jp/files/file/luvesofivek.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_off0000dbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 19232 bytes
SHA-256: 76f01ba20541e743310bf7380dee5578cf4a67a7de98c54ae46ca73a74f51647
font_01_sfnt_off00010e64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E64 11052 bytes
SHA-256: a9a4eb3442b1c5051ea5206dc983198bd174a4537b24b5d635eb6e833c0d698b
font_02_sfnt_off00012879.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12879 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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