Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f9a37ddadc5d0a8…

MALICIOUS

PDF

79.7 KB Created: 2021-09-16 21:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8327ade89f39b70a527159796f632458 SHA-1: 2ec0b0fb343f8d96329708afa0a3d21364408a7e SHA-256: 1f9a37ddadc5d0a874fd38e75e6f9e8612263c3112077b02c407a7d3237d0a01
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The file's structure and the presence of multiple external URIs strongly indicate an attempt to lure victims to potentially harmful sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://crysiq.ru/uplcv?utm_term=no+1+photo+editing+app+for+android PDF link annotation
    • http://hamishehbaharcarpet.com/My_Project/Hamishe_bahar/ahar_img/files/polukefajob.pdfIn PDF document text
    • http://furnitura-syndicat.ru/ckeditor/ckfinder/core/connector/php/uploads/files/59751258321.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/godavuxut.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16134e354c8e2f---benimanaposafop.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/16427350602.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c84cc0c632---46271413115.pdfIn PDF document text
    • https://karpataljaturizmus.hu/upload/92633164728.pdfIn PDF document text
    • http://winecellarkeeper.com/ckfinder/userfiles/files/zufakasesibugolusubos.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0a8f7c210---45716417671.pdfIn PDF document text
    • http://launensia.cz/ckfinder/userfiles/files/18592173786.pdfIn PDF document text
    • http://sunnyten.net/userData/board/file/putisit.pdfIn PDF document text
    • https://mbzl-pro.xyz/web/img/podborky/files/27474371960.pdfIn PDF document text
    • http://quatanggiabao.com/images/uploads/files/6866393453.pdfIn PDF document text
    • http://valdhans.cz/userfiles/file/beduwojanezajalawozafepi.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/909a78395ae546fd8e96a436854a0767/dezajedisakoreravad.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/jelaxojibagol.pdfIn PDF document text
    • http://rintoyo.com/userfiles/file/sigarupujomobipuzenexifu.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16141e76371796---zaligomudanemojafepe.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/32740352971.pdfIn PDF document text
    • https://cafemocion.com/userfiles/file/65940188588.pdfIn PDF document text
    • http://eqletstalk.com/uploads/files/202109151454029532.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/xomizilifawupatemuxuvu.pdfIn PDF document text
    • https://bluza-shop.ru/content/File/rusex.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161309d201dfae---dupejoki.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_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 16628 bytes
SHA-256: 5121c7117eafbe7deb84421180edcaa634b75b99dc82dad911d3ae6b6ec432e9
font_01_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11994 10592 bytes
SHA-256: 092300fcd95109d0d2a3d75cd4306844f589fa2c76b41cc19010a20ca586be35

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