Malicious PDF — malware analysis report

Static analysis result for SHA-256 f06147edc31a601d…

MALICIOUS

PDF

78.5 KB Created: 2021-09-20 18:55:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dc053b3b322e08f390edc2d327d93879 SHA-1: 4cc002fde1e4a5761207e2b4eb043a8b3a07a121 SHA-256: f06147edc31a601d1e3797295f89ac6e3a105fc924e63e8b9067ade8df39134a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to potentially malicious content. The presence of external URIs and link farm heuristics indicates an attempt to lead users to external resources, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c1c511e14a---73834292279.pdf In PDF document text
    • https://floridahouselottery.com/test/userfiles/file/bobifo.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/dizumipevatenu.pdfIn PDF document text
    • http://lifebeachvilla.com/uploads/image/files/92836952145.pdfIn PDF document text
    • http://budropol.de/Upload/file/16628171710.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/95916469358.pdfIn PDF document text
    • http://gymostrov.org/gymostrov/userfiles/file/zitalefopunelas.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/172t4sedvpv0ajol9di342pai5/4113452176.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/67743344124.pdfIn PDF document text
    • http://net-work.cz/data/file/27554704540.pdfIn PDF document text
    • http://onlinevay.com/upload/files/poralinumulivekugog.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109151457181707.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/39203969398.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/mixutexonujilolu.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/36435074345.pdfIn PDF document text
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eb770153d---diwufogakavileluzakotu.pdfIn PDF document text
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/051d52952bc5db87f41d727955156057/jedakepe.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/nesimidezu.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a31527d3b9---litivapuboni.pdfIn PDF document text
    • https://smartcrm.cloud/upload/files/40902307769.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/17702545350.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613764234c865---fuvaroxijux.pdfIn PDF document text
    • https://www.channeloflove.com/ckfinder/userfiles/files/lumusimuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=harry+potter+part+1+full+movie+freePDF 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_off0000cf6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6E 17344 bytes
SHA-256: 7e27ca44e7cee40caa53fed5d3fceadedcf28ab0b40267469c1cfe746bd4cc58
font_01_sfnt_off0000fbe3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE3 10568 bytes
SHA-256: cef8c4b4eb129157fe59ec3b59182cea55d87aeaeaa6ba543ca01d7a159e99f1
font_02_sfnt_off00011414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11414 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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