Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8d81401c3cd701…

MALICIOUS

PDF

70.5 KB Created: 2021-09-09 19:30:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5f92f18a51c0989965a46e568b5627b9 SHA-1: 114efff341df04fce9b9c871621a38ef8b6301b3 SHA-256: 2f8d81401c3cd701950ffc6b34cfacb8842730e629c553b8f880e5904f4dfaca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are identified as disposable hosting or compromised CMS uploads. The ML classifier and ClamAV heuristic strongly indicate maliciousness, likely related to phishing or malware delivery through these links. The document body is heavily obfuscated and unreadable, providing no direct user-facing content to analyze.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://bnbtravels.com/ckfinder/userfiles/files/zavukapirotajoxeko.pdf In PDF document text
    • http://materialdeestudo.top/userfiles/files/lutejefitudonukidizusimo.pdfIn PDF document text
    • https://doluhosting.com/calisma2/files/uploads/sagoxiremowudilisezu.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/25729926213.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/71866c4504cba30f949e51a78f8f633f/gizujelireguvubisimitu.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/gesulagewelik.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/fafif.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210903190136177.pdfIn PDF document text
    • http://union-montage.pl/userfiles/file/sanisebaliboxerav.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-5/20210905053433275018.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/6584777265.pdfIn PDF document text
    • https://manenshop.com/upload/files/dinuluturagazedirazumaje.pdfIn PDF document text
    • http://plenerowe.kbo.pl/ckfinder/userfiles/files/58350995691.pdfIn PDF document text
    • http://patanjali.zohukum.com/ckfinder/userfiles/files/jivijunagigopajesabuj.pdfIn PDF document text
    • http://identik.hu/editor_up/xalugibivamebowip.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/gidawuramikajeketovubo.pdfIn PDF document text
    • https://siroyensao.com/upload/files/12273605976.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/161367fa6c64ba---25309739897.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16131f68bc4c0a---29172021438.pdfIn PDF document text
    • http://bcslaw.hu/admin/fck_upload/file/vubuke.pdfIn PDF document text
    • https://lawweb.info/mycms/admin/userfiles/file/38573381431.pdfIn PDF document text
    • http://divorcefinance.nl/uploads/file/96934468879.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/walaresolibibemafijawadaw.pdfIn PDF document text
    • http://encino.kopanramen.com/uploads/files/85905555941.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=custom+wallpapers+androidPDF 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_off0000b37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB37E 15612 bytes
SHA-256: d96be9ee66e62fb03b10b94923bb240c540c1a877df6b7cf1c3bfdfe8aa4dfac
font_01_sfnt_off0000db4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF363 10768 bytes
SHA-256: ccae29ba34dd97c93a1c0d0c9b83adf0e369072be104bfcc855ec8ba1db3bf93

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