Malicious PDF — malware analysis report

Static analysis result for SHA-256 4313b45ea8914e17…

MALICIOUS

PDF

88.6 KB Created: 2021-09-01 08:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d6ec1767e22e6bedd304f2f76efeff69 SHA-1: 168551af877d1b4df37e5b5baa2259e6b9e515cc SHA-256: 4313b45ea8914e17d0e4226fa81c5de9327756f0efd217d1830595895b79db68
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves luring users to these external sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/mevunemabolomegegelawe.pdf In PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/7b5ead81ba150097a36553203e6c8082/75122805559.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1624009519.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161294183a4341---68622812948.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/827404eada10cd53646517001b58bafb/gukapukexesonexiwabavozar.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/28349098609.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ea1cf044d---ziwepujogoxukok.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/90031727640.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/8720e5c8e04f86cd5eecaea80cb00538/kerejufokewananupamago.pdfIn PDF document text
    • https://albizy.com/ckfinder/userfiles/files/84183318790.pdfIn PDF document text
    • http://traslochimontalto.it/userfiles/files/gawetoriparolamerowogogi.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/aiqjbkrjssme54n3oq8pgmu2c9/nujowon.pdfIn PDF document text
    • http://nanumed.ro/uploads/files/xagulewojax.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107c01d5b62b---52389786843.pdfIn PDF document text
    • http://chongros.com/userData/board/file/2278444555.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/36758000229.pdfIn PDF document text
    • http://esistore.be/userfiles/file/vowejanuvafosere.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/ecd17c29706630a43e04c098e5520c88/gelatiwopubofagesevuj.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/gigupazekabepen.pdfIn PDF document text
    • http://deasreunion.com/clients/860224/File/92248395609.pdfIn PDF document text
    • https://colakcivi.com/userfiles/file/sufalekitipa.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160987f71a12e8---vanidexo.pdfIn PDF document text
    • http://pecsimutargygaleria.hu/files/file/39778143776.pdfIn PDF document text
    • http://flyingfish-stay.com/userfiles/file/tivofavakolidigufulofugo.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/lijujogerisokasuwegetos.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/85531a5e281563b4cb3cd595e98cd840/faniwuledogemuga.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=desertification+due+to+climate+changePDF 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_off0000f2e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E5 11024 bytes
SHA-256: 5e355a31bd375903a3dc225c8482380da139ae9ab5d3d45706f29d476fbf8924
font_01_sfnt_off00010c22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C22 18172 bytes
SHA-256: 916e7710810fb1b759753f2c2ba7fb513d213caa2ff69b42bea002ea01a63884
font_02_sfnt_off00013b66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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