Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca76e2942cf87996…

MALICIOUS

PDF

81.0 KB Created: 2021-08-29 07:38:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 343d216445c7070200395a51d36ac1f2 SHA-1: 059fa36b86627b0ea0e24dc3306efb4244e08a3d SHA-256: ca76e2942cf879965d4066c155e90773c103b73631ed1f51291ac5ef898feb52
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or are part of a link farm designed to obscure the final destination. The primary purpose appears to be redirecting users to potentially harmful sites, consistent with phishing or malware delivery tactics.

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://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/i3pqbfap5a9imd4a9ahgo6n9rk/wopilatagaboso.pdf In PDF document text
    • http://www.petersonassoc.com/emailimages/file/11818341141.pdfIn PDF document text
    • http://pogservice.ru/userfiles/file/xevaxilu.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1610fed7b4b895---30834236725.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/be334a1151e02f8811201b66f4591b58/21329244396.pdfIn PDF document text
    • http://airelimpio.mx/img/editor/file/muwasejawujigof.pdfIn PDF document text
    • https://tortugafilms.ca/adminfiles/file/41852397830.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c142b9535---78109040617.pdfIn PDF document text
    • http://oldtimerclub-thueringerberg.at/images/file/jamafafilemuxebebe.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d38c7ec35---6683450294.pdfIn PDF document text
    • http://toanthinh.vn/webroot/img/files/84373451052.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/podirawomizoxenufojitobaj.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1609a4eab099fd---jobonapimizawefepo.pdfIn PDF document text
    • http://rethabise.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160742cd9b83f9---wovixi.pdfIn PDF document text
    • http://hamzalegalservices.com/userfiles/file/14100009222.pdfIn PDF document text
    • http://www.corazondelsol.es/ckfinder/userfiles/files/7629531063.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/99108669745.pdfIn PDF document text
    • http://nakatka.com/files/file/33234367742.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/nukodofizibuwigisu.pdfIn PDF document text
    • https://sonarmusic.hu/up_image/file/43602595205.pdfIn PDF document text
    • http://bi-acaovo.com/upload/files/rozajotodefazulepopodage.pdfIn PDF document text
    • https://haltia.mx/sii/ckfinder/userfiles/files/15197330664.pdfIn PDF document text
    • https://dmvassociates.com/wp-content/plugins/super-forms/uploads/php/files/8133103caa4da5d755498a1d0ace17a0/soverovabatokodudiju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=can+you+break+your+collarbone+and+not+know+itPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/939f0403575f10bce9b2701a86d99dc7/vawesanajizisotowewij.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_off0000d933.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD933 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 16508 bytes
SHA-256: da2cb813c7f8d8893bc44ba1856233ad63860128fe1cdaa5f700afbd34fef0cc
font_02_sfnt_off00011b8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8A 10760 bytes
SHA-256: 2133d76c3cd0ca783a3a1980096af3ad3ea27e691a5e27a757ac673c20106af0

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