Malicious PDF — malware analysis report

Static analysis result for SHA-256 94cf14b679701346…

MALICIOUS

PDF

86.7 KB Created: 2021-07-01 11:55:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 77407d4b9cc22a6084acf0edd3b89ff9 SHA-1: 19af6394303ba0a184d18ef87f1f43a5bf1427ee SHA-256: 94cf14b679701346a059199d7c3c6adc70495f517bc1bdda9901f472312b8700
156 Risk Score

Malware Insights

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

The PDF contains numerous external URIs and is identified as a link farm, with many links pointing to compromised WordPress upload storage and disposable hosting. ClamAV detected this file as Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0, and an ML classifier also flagged it as malicious. The primary attack pattern involves directing users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/uplcv?utm_term=how+do+you+type+fractions+on+a+keyboard
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda4ed94fc5---gomalatarevu.pdf
    • http://csptech.net/admin/userfiles/file/wurefikamazab.pdf
    • https://southernlightingsource.com/wp-content/plugins/super-forms/uploads/php/files/2422a410f32defba250802b60d2a6613/kisexiwanilesogobide.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/7d4ef30ecfe231a9eadb0d3c67e3cf03/dananof.pdf
    • http://aydinservis.com/ckfinder/userfiles/files/viwonukubuj.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/f2ee5db133bcb6389b656537c02d40d5/49474198871.pdf
    • http://pillshop.ru/uimg/files/31874943010.pdf
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/723c1e0b7f6f4de9e248adb0d44b2408/93056360904.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/160996f4a01e06---natut.pdf
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160985c13bb354---wivixudadanonekavuxo.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/d3adf912d48ae0833e9c043b02f9fa3e/wazokimux.pdf
    • https://mavibusiness.it/file/ganafomovolebabu.pdf
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160979a28d60d6---57626468696.pdf
    • http://bukharageorgia.com/sites/default/files/file/61037353444.pdf
    • https://www.albispanaderia.com/wp-content/plugins/super-forms/uploads/php/files/b06173c0245d277cc73657b59d7d1461/89950853295.pdf
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc034be69e---seguzuzinivov.pdf
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/62b5f94861ce66909a410fd40cad82af/zotazirofeguruvi.pdf
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608171fe6f20b---86689327045.pdf
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608da7b27a7ef---18688591067.pdf
    • https://aashianarealty.com/file/mukonutabivi.pdf
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b72f5402508---93524052462.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/ropii65b84n2qp4u9n5iruqcs5/sisotudixepe.pdf
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2cf4a1edabb796ef040dc2f8aa0321e9/53119733660.pdf
    • https://lexcyberia.com/userfiles/files/vuwipowutufodidajavukif.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e99b.bin
cbd78451bc0d567628b34aff2a0997dd55fbcf94eaaf9518ec3cb1c417293037		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE99B 11092 bytes
font_01_sfnt_off0001036c.bin
f711416713a36a9bf55b50767cb4bc4956714ebdd39433f92502da001359c235		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1036C 19872 bytes
font_02_sfnt_off0001353b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1353B 16792 bytes

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