Malicious PDF — malware analysis report

Static analysis result for SHA-256 5de5331ddb01577b…

MALICIOUS

PDF

68.3 KB Created: 2021-06-20 10:31:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 41aeb13652587d6affc5b68b38bf71cd SHA-1: 13c0d1e1f854592042a5e0f836f33fcbcdee6719 SHA-256: 5de5331ddb01577bd7fb82304b94ea2d9b42d6a64a7051a72ea146d5c07a8d28
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link T1059.007 JavaScript

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing and trojan delivery mechanism. It contains numerous links to compromised WordPress upload storage, suggesting it's part of a link farm designed to distribute malicious files. The presence of a remote-support tool lure indicates an attempt to gain unauthorized access to the user's system.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b9ba956b627---mokofimonuv.pdf In PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/e940ca4be94689839448ceb415f546ff/totidewujipezi.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608146aec1cd3---76188241656.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2eac017c2---gibupixokisadokajazupo.pdfIn PDF document text
    • https://apparel.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/dbd6682a175c7796dbae49eb3e342f8b/86573435056.pdfIn PDF document text
    • http://mistralizmiryonetim.com/uploads/file/46162228309.pdfIn PDF document text
    • http://odpadykj.cz/UserFiles/File/tuvesexogetanogenakutof.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/1368d78fcab0bfeb1748b3c23138066d/piguzemupag.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/52418668001.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/33711785015.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708fef475a9---rowudo.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9da0cb77f---47645831129.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/d0ithdklki54btujjqajcf6nr2/86184461905.pdfIn PDF document text
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/85e14034s6l46tpkn0u40js73k/34089125442.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2c2dc0ca7---mapinofigiwebaguvez.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a430e0ecde8---58334866917.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16090b643c95ae---vinizarisirorapibuzenij.pdfIn PDF document text
    • http://tubietelbar.hu/uploadfile/nuxunifadexisenuluwu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=crash+bandicoot+download+ps2PDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF7 5432 bytes
SHA-256: db3efde4f63644728f8dfec52abec8fa24f49f12f1d024531e4546b685dcce3c
font_01_sfnt_off0000de6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE6F 11256 bytes
SHA-256: b1c35ee82837d10ccb448630f91a9cb9c96b5efb25bf57252c01eded468e0311

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