Malicious PDF — malware analysis report

Static analysis result for SHA-256 96bc717e4f66f071…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 18:31:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9c2c403cd39af4f8dfd7d477276c468f SHA-1: 167c317f23e93286e352aaa95cce57ac4c1ef7ab SHA-256: 96bc717e4f66f071ea881448b5afc6bb1f672a597a23528c8127eced4bb23cbf
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to obscure the ultimate destination. The presence of external URIs and a link farm structure suggests an attempt to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://euro-ex.net/images/blog/file/tiverojafokudubasad.pdf In PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/3084d86916785f9320ff03f956783f44/29103397124.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131acb61b84b---fesidevotevezereduxora.pdfIn PDF document text
    • http://ville-dammarie.com/ckfinder/userfiles/files/fowipirizutedakivubujo.pdfIn PDF document text
    • https://segurosjdd.com/wp-content/plugins/super-forms/uploads/php/files/9jromu6j0bkclq5n4mthdovel6/92487158374.pdfIn PDF document text
    • http://infoegrafica.com/userfiles/files/linamewiwevuzezipewu.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161333d3da6c9e---guzadobunukinuvosoxovejud.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/wugibe.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/28838714702.pdfIn PDF document text
    • http://khacvietlaser.vn/public/images_news/files/81553638388.pdfIn PDF document text
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1a2e21415---japumiruw.pdfIn PDF document text
    • http://efuturesthai.com/uploads/file/31065826457.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/kenonefelofimuzebidigabu.pdfIn PDF document text
    • http://hyunsin.net/userfiles/file/nepogumazi.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/xoxenenezeravuv.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vopaxavamivunetidixulikuk.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/19335053857.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/c6d9b9c24caad705774cb9a5061f2944/86891472476.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/0bc4ee3199abe395b52316943c4e08f9/bifudulujepu.pdfIn PDF document text
    • https://opescom-store.com/uploads/FCK_files/file/54587298950.pdfIn PDF document text
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/reludojobi.pdfIn PDF document text
    • https://weilmclainboiler.ca/fck_upload/file/tulosomomev.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613bcd9768d9e---90044918260.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=redmi+note+5+pro+genshin+impactPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB885 18960 bytes
SHA-256: 59216a0a2835afbd53f0f262e9304d37c80fd8eec4eb525e6d84fbba3d90bb33
font_01_sfnt_off0000e83a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE83A 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_02_sfnt_off0000f0e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000108f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108F8 11096 bytes
SHA-256: 8df502305d17e57bff4fc7102e9837f7772ee1090a0ad6bae5b8ab7c96cce226
font_04_sfnt_off0001227a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1227A 16500 bytes
SHA-256: 97392d9b2d827add02e1978fdc0f50d6c131b5bf63b9db48b141bf971524ef76

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