Malicious PDF — malware analysis report

Static analysis result for SHA-256 f66ab795a5a2454d…

MALICIOUS

PDF

84.3 KB Created: 2021-08-20 13:07:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 800a561da7c3dc0ffa54026093a750db SHA-1: 7a61cc6c00a6bea66c4f563668c794632b3070e4 SHA-256: f66ab795a5a2454d92e1a8f62b73ba740a2f9d4c95274a7e73fa4af23aa6927e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the links and the PDF structure align with techniques used to lure users into downloading further payloads or visiting phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://altelaw.com/uploads/image/file/renaroka.pdf In PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/pukoberikal.pdfIn PDF document text
    • http://shopsuathientu.com/uploads/userfiles/file/gukipizidogukiguxam.pdfIn PDF document text
    • http://everintelconsulting.com/upload/file/202108181404047065.pdfIn PDF document text
    • https://stalbeckers.nl/userfiles/image/file/depibaruno.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/87576516705.pdfIn PDF document text
    • https://www.idromeccanicasrl.com/idromeccanicasrl.com/wp-content/plugins/super-forms/uploads/php/files/99c5347cea1f6d9aec41169775e8deef/22295807368.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/dizesokoxifukub.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/c29c13925fcacbb6b611b20c1fa78e33/nejikodirabo.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e05358cf0---lipenuwodikuzabuwojika.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/jefatilaje.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/64056658146.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161156c319ec56---74438903515.pdfIn PDF document text
    • http://hocikto.info/userfiles/file/wifuwufikaxotikapidax.pdfIn PDF document text
    • http://eths1967.org/clients/6/6b/6b000f7c2bca5b3a89f93fde6b54c5e6/File/68489374666.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608872c244fea---10218378965.pdfIn PDF document text
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/q20lj4dsikul15da77cmve7mk5/28959061512.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/91107120293.pdfIn PDF document text
    • https://conexusinternational.com/ckfinder/userfiles/file/25970259484.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/90v6ij6u6kd8f37eelv6smrq36/73438998107.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607051455ac7f---kodefizejezotewirewisi.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/68371642388.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/0f7bc5eab92d63b1489f844875264fbc.pdfIn PDF document text
    • http://habitat3.eu/userfiles/files/febutodivekujemop.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/16541149469.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/14e55b680b1bdda7ab7b47ccdc698ddc/zomupewa.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c26f53bbfc---48409329148.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=anonytun+pro+apk+settingPDF 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_off0000e594.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE594 10668 bytes
SHA-256: 9cccc8c38ab45defb037699978f51541882c60df3e303a1ffcdc07eaef96059f
font_01_sfnt_off0000fe45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE45 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011657.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11657 17244 bytes
SHA-256: 498d2e1ecc65006b79c99dc998e03324a5f0d0c43bdc7b9c344a5669acd9f96b

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