Malicious PDF — malware analysis report

Static analysis result for SHA-256 5903b5e241a4b748…

MALICIOUS

PDF

75.1 KB Created: 2021-09-06 08:10:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b9c0d02fc684b9061769103d3e2b779b SHA-1: 2e409d49295262f7f3c1cdfc40af7f62d78400e3 SHA-256: 5903b5e241a4b7481eabf2f5e40be6841edb932e807cf9591d429592f479ea4a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV as a phishing trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute malware or redirect to phishing sites. No scripts were extracted, but the presence of external URIs and compromised CMS uploads indicates a malicious intent to lure users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://pistant.ru/uplcv?utm_term=degree+of+comparison+worksheet+grade+3 PDF link annotation
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac40e6a6eda---68659959874.pdfIn PDF document text
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/c83eb32e233d14c95d9f7ce36bbe9711/bunavasemukudo.pdfIn PDF document text
    • http://absigorta.com/E/file/gaxezuduxo.pdfIn PDF document text
    • https://thefencedocumentary.com/adminfiles/file/75918804217.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/35866231700.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/segixuzutanapuzedireduxu.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/e1171fd3d74dd5f7c90f077fb5b0feeb/33821753332.pdfIn PDF document text
    • http://granitemountainranch.net/userimages/baputubetamumefopen.pdfIn PDF document text
    • https://franchiseharbor.com/files/files/13711229512.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/q4bhpg95l2gk3c3t067rbshof6/vedevuluvugigesowemedafud.pdfIn PDF document text
    • http://zatexpress.com//upload/userfiles/files/47844150796.pdfIn PDF document text
    • http://fueandhair.com/userfiles/files/94657049680.pdfIn PDF document text
    • http://dtyxbpzx.com/filespath/files/20210901010719.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/4051f55224b27b927c646912194c7dc8/liguvopofobetarubabitut.pdfIn PDF document text
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/5cfbd60f4999a4e04acd72a0205e4354/xeputiziwoborizi.pdfIn PDF document text
    • https://artlabjo.com/userfiles/file/67610515371.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d022153eb92---76646195201.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/39504928681.pdfIn PDF document text
    • https://solucionesinmobiliariasavg.com/ckfinder/userfiles/files/28757981421.pdfIn PDF document text
    • https://pointvirgule.ca/upload/editor/file/kunedaropifibapus.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085de2a49cbf---tozatapepabidopimed.pdfIn PDF document text
    • https://sofupingame.com/calisma2/files/uploads/viwokuxusolumudemese.pdfIn PDF document text
    • http://architettipassarinmarzotto.com/userfiles/files/zovaxenafimijadututi.pdfIn PDF document text
    • http://jorkurojus.com/userfiles/file/femasofibaviv.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_off0000bf5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF5D 17100 bytes
SHA-256: e2d9e70ce04099c2050d258f719b22439dd21afb12772ff281bcaee52d31bd5d
font_01_sfnt_off0000eb97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB97 11372 bytes
SHA-256: 7dcde7c50933e063053c0fedcde5d9aa851c2cbf26a8034575d5b55c6d3d2ff3
font_02_sfnt_off0001061f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1061F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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