Malicious PDF — malware analysis report

Static analysis result for SHA-256 41dd790761ccc090…

MALICIOUS

PDF

88.0 KB Created: 2021-09-01 10:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 764f1e4cac83510cc8d8e79b7b65ff5b SHA-1: a01a57259420a7ac5eac3a31e58baf07c96a2dbe SHA-256: 41dd790761ccc09053c0ec95a06268a3347375913fd172d51eb0a5a3edac8f4f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of external URI links and a link farm indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://altonika.pro/files/fck/file/87036800506.pdf In PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/707f71f9b9a2cf8d70717bc803a0720d/84835068949.pdfIn PDF document text
    • http://bptramptour.pl/files/file/75481792675.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16073a36a7a007---mumelovibatepebukevuxi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d26181866e8---rujolupetes.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/kuniwonubufi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dfb8e059ab---ruxupivuvukopawewogapuw.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/e00c3bba6a389858454ed8300ab7b362/nuben.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a93f0b9921---75158206410.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/tovita.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/vonojuriliduguwel.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/67531377984.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/68640658864.pdfIn PDF document text
    • http://tamlaproject.com/userData/board/file/8044391972.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/64104329975.pdfIn PDF document text
    • https://apgr.eu/UserFiles/file/nobumiramibeke.pdfIn PDF document text
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/r4cbeaorfj7lnua496r0m7sast/rudagavexu.pdfIn PDF document text
    • http://gaziogluenerji.com/images_upload/files/2165540406.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/321ef51248886086072498d39fcb145a/75774768247.pdfIn PDF document text
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/jtnqsoj165cvdnmjc2tpj2k1n6/wawosinemuvabokiketafe.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/18952444700.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/rabexevevipevulu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=impacts+of+climate+change+in+uganda+pdfPDF 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_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 11016 bytes
SHA-256: a484870166761a487d7c3620eb1ceecb13cc7427c1eee5d60232f61d86bfa949
font_01_sfnt_off00010a1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A1A 18232 bytes
SHA-256: 02dec4cb54a5cbd03db76d59c85282a522b4f3751d3bf2b6d3ec32692b416045
font_02_sfnt_off00013919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13919 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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