Malicious PDF — malware analysis report

Static analysis result for SHA-256 1053c4fa8977c353…

MALICIOUS

PDF

73.3 KB Created: 2021-09-03 18:05:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 1e9ecbedc5ad1c427909bdf170d99b31 SHA-1: 8f03fc3c252e6dfc0008bcd8d1b01a6468a5f19a SHA-256: 1053c4fa8977c353561ae08109ab9a839c0de3ab73335d908f11cc16fe211675
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this file as 'Pdf.Phishing.Trojan', and ML classifiers also flagged it as malicious. The presence of multiple external links suggests an attempt to lure users to malicious sites for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://ises.ca/phpsites/vertical_living/uploads/file/pumuxobabemurilaradomoti.pdf In PDF document text
    • http://slsnn.ru/content/file/45919170760.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/949b5166cfa0b74850c7b216bcf11b6f/kixokosuvevetiveg.pdfIn PDF document text
    • http://tablica-nieruchomosci.pl/uploades/fckeditorfile/lilevo.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/nevar.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/xenotajosumolopa.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/nejekiwinakex.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/joponego.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b82c639c8---25106975929.pdfIn PDF document text
    • http://sancheonglittletheaters.com/upload/userfiles/2021/08/files/210816090459.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/givijepexesaris.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/soxananox.pdfIn PDF document text
    • http://partnercable.hu/files/87426961191.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/74jlu044o3a7ier2nv7iaom6rl/56506240102.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/325dd504cefef41d086b15feb1439e4e/32300742898.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/besakuboxefepobosugedadod.pdfIn PDF document text
    • https://altaamir.ipixpms.com/Rapport/public/assets/ckfinder/userfiles/files/57473423558.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/43563800827.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607c14fad3a3e---jidivivoxajubowuk.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/majuzarelig.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/5gg7ccg1uv1oq6j602fhfbdvlb/lejinuraj.pdfIn PDF document text
    • http://stepsforstarlight.org/clients/c/c6/c668404594a1c08d975ab50c7bec58f6/File/65855519550.pdfIn PDF document text
    • http://lapenya.cat/imgjovesnaves/file/vodanosi.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160beb8a573f3f---12083263492.pdfIn PDF document text
    • http://sfera-vlad.ru/img/file/jidilijosoroxetuduluraxu.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/1eb53daef909730920cb8467defa5d25/72983616743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=south+america+capitals+worksheetPDF 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_off0000bc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC31 16296 bytes
SHA-256: eac431e75e4a1c4c7e01d31b8ee7cc0b55e124391de053b7d76e4f63230f0481
font_01_sfnt_off0000e5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fdfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFA 10888 bytes
SHA-256: 5cfc3cc6ee231ab716976b22b703c570b24ff45ff336af8dd8a5ed1749c10a37