Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d2051e8a7106f25…

MALICIOUS

PDF

79.0 KB Created: 2021-08-27 14:47:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a4c9d683bf1e02f35a7af7cb7e5af958 SHA-1: c2635426d37725a03d611c575fd8b51d1ccec83a SHA-256: 5d2051e8a7106f250310a30432caac1c3e2fdca713f5290b1c7add48d000421d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a phishing lure, utilizing a link farm to redirect users to external sites. Heuristics indicate the presence of compromised CMS upload storage and disposable hosting, suggesting an attempt to obscure the ultimate destination. While no scripts were directly extracted, the overall structure and URL patterns point towards a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://engineeredrepinc.com/wp-content/plugins/super-forms/uploads/php/files/00920d93e61deb49cf2a1425e4f7f3d4/78761630553.pdf In PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/11370526638.pdfIn PDF document text
    • http://hphs1958reunion.com/clients/47465/File/desijufesezi.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/penomovikulen.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1609b548e63320---43466591046.pdfIn PDF document text
    • https://www.saammohaseb.ir/wp-content/plugins/super-forms/uploads/php/files/ce9d26fc01ae748d885de3a5e5f774a8/labuloduvopafizozewapowel.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8645ae079e---90911514142.pdfIn PDF document text
    • http://humboldthighclassof79.com/clients/1/19/19f040aad945c40a0acbd79abd3dc6cb/File/21573517630.pdfIn PDF document text
    • http://saltokisport.com/uploads/files/bowokepekazanu.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/gat2cihivaaabfb7c26kfaqjsl/7723206637.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/95173346986.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/0d1bf10e05d64e439b3873e59c4348f7/20707024525.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/2c9b0905bf97090b08dc3e83f36d971d/somax.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1609fc7e52725a---85176547241.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/19230809647.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/sogosag.pdfIn PDF document text
    • https://flycam.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609e722ce2027---doxojopawevajiveg.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/kuvowototifibinu.pdfIn PDF document text
    • http://zulassung4you.de/bilder/file/8999974937.pdfIn PDF document text
    • http://drentmedischadvies.nl/uploads/files/xolupubudenagizaxawa.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d27dc2cd9c---dawifukebafokixezu.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/towuxivixudawevu.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/d387c98866f5727c7ceee7db0bb3cd02/76833347010.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cat+paw+cut+and+swollenPDF 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_off0000d41b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41B 16524 bytes
SHA-256: 026c84868f69120644261e421619dbb58e40fd0f8d4b370a6a9754bc0755b551
font_01_sfnt_off0000fe39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE39 10532 bytes
SHA-256: f779ce3eb24cbc9e8c1a51289c75ed2d3a18820dc12fbae9663cdb2d10fb0ae4
font_02_sfnt_off00011679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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