Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f288f8731ecf817…

MALICIOUS

PDF

69.2 KB Created: 2021-09-25 04:07:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a0a9c3b1b1cadce4e8c748b954237992 SHA-1: e27b6ac1a1c460d83446f62c12ce5631df713bd2 SHA-256: 9f288f8731ecf817261876f19c32d6d79ae374c411d80ca1be0c1d73789e60a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to obscure the final destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for initiating malicious actions within a PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dpholding.ru/uploads/files/taratonujekujufirezebize.pdf In PDF document text
    • http://carnow.jp/js/upload/files/54647422509.pdfIn PDF document text
    • http://paraleumarian.ro/app/webroot/files/userfiles/files/90267599363.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/nasemeninalitusevem.pdfIn PDF document text
    • http://mawratanews.com/armedia/uploads/files/xemolinoxuxoxebu.pdfIn PDF document text
    • http://bonaparte-kerkrade.nl/fckeditor/ckfinder/userfiles/file/kaxagejipusasemube.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161471fca07a45---95454959665.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/diwiramanadijepam.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1614726295513a---rakipemudori.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/zavotinobubu.pdfIn PDF document text
    • http://gerocuki.hu/user/file/wasofox.pdfIn PDF document text
    • http://xn--lv0az70cxar.tw/uploads/files/202109080203257846.pdfIn PDF document text
    • http://cappellastudio.it/userfiles/files/godalazi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907220011691053.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/90292042714.pdfIn PDF document text
    • https://euforbiabulgaria.gbinvest.net/uploads/pages/files/lefijogi.pdfIn PDF document text
    • http://studiozoppini.com/userfiles/files/rapix.pdfIn PDF document text
    • http://mastera-mix.ru/ckfinder/userfiles/files/nobekuwifonopaseware.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/logesujozixit.pdfIn PDF document text
    • https://ihappywash.com/uploads/files/202109180420388653.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145d5fb2964c---22829415686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=print+pdf+with+annotationsPDF 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_off0000adaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADAA 10504 bytes
SHA-256: 9f23533458e1ed25e6052c3353e0344c938ff396a04a49c169f3b571de373ee3
font_01_sfnt_off0000c585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC585 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dd97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD97 16688 bytes
SHA-256: 102af5732478db6d4c88bedf14c64d6bb7fc0ccd9d07e501f18c39325fc84d05

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