Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d0df5f88766c15c…

MALICIOUS

PDF

100.4 KB Created: 2021-09-05 12:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dad2c4c9b82f8b0822ccf3d6e38638c5 SHA-1: 998267a786c3e2e0c05005c14f1feea1ba4f0b17 SHA-256: 1d0df5f88766c15cd5999bb9abc54fda58bc0d187683847b0c745b6c7b447a61
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 domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the document is designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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://kaies.cn/upfiles/file/tazurawe.pdf In PDF document text
    • http://hainfelderteich.at/rapijiranixuvozul.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/b1a14978533ab193b6e15c2db31e0a08/46986359360.pdfIn PDF document text
    • http://ck-kutnahora.cz/gais/image/file/tusisivibogag.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/jawapip.pdfIn PDF document text
    • http://chinalabware.es/d/files/47190878183.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/q4q1tvog83c6rvn67qtp1rld25/49021049130.pdfIn PDF document text
    • http://candientuvibra.com/images/file/tufot.pdfIn PDF document text
    • http://rehahomecare.com/upload/editor/files/fopofipif.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/winizekezebodaxubof.pdfIn PDF document text
    • http://chroscina.com/userfiles/file/73420530617.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/vamujoxu.pdfIn PDF document text
    • https://autoprofi.ua/userfiles/file/xakenuralirubegatop.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160c384b00fede---85092189767.pdfIn PDF document text
    • https://airshow-bg.com/file/91648329363.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad1b75d521f---6561269289.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/ap1ldtpnfl8citoelpefrsdr7e/734012535.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/jufagetofowifegixujino.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/7950576015.pdfIn PDF document text
    • https://thediamangroup.com/_images/files/83874115677.pdfIn PDF document text
    • http://rideco.hu/upload/file/wamakupozoxiladikozosijo.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b2702f383d6---xaresiti.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160901604efd4d---88934408408.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/98985973817.pdfIn PDF document text
    • http://clinicaveterinariagussago.com/userfiles/files/73922130107.pdfIn PDF document text
    • http://cukrarnakolbaba.eu/obrazky/files/xukarulonefo.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ad6bb20566---70599707303.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=kepemimpinan+dalam+perspektif+islam+pdfPDF 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_off000125fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013e12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E12 10624 bytes
SHA-256: 246740f87a8da35395817544b2e5f159fbd83d3c9872e8cda12cf623a38e5a3d
font_02_sfnt_off0001564c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1564C 17312 bytes
SHA-256: 58811421ea827ec564a78a0400d6a1ce784808b07149e9267cf27097d89b57a9

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