Malicious PDF — malware analysis report

Static analysis result for SHA-256 827dfc74e91cd51a…

MALICIOUS

PDF

69.4 KB Created: 2021-09-25 04:50:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d9a36a8de9878bfa08064a4f193534d4 SHA-1: 0f121e41c20c0bc0abf2faa571caef6a43639e1d SHA-256: 827dfc74e91cd51a50d9d2267f9cb33faba5d6b8e458bf53ee2b35b81be21065
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. Several heuristics indicate the presence of a link farm pointing to potentially compromised or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://mps-india.com/userfiles/files/bajitidivuxeliwutuzuj.pdf In PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/nologa.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/14945550097.pdfIn PDF document text
    • http://cathugo.de/res/wysiwyg/file/531488882.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5751e036af0fbb6af7cb05d32ed941a6/98443162682.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/mudijolinuwiwewuso.pdfIn PDF document text
    • https://pmrmhss.com/userfiles/file/36962541859.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/53219012450.pdfIn PDF document text
    • http://avandcie-energy.com/ckfinder/userfiles/files/ruwofuvinuwasovak.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/felitufokajibakaxux.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/mamuwito.pdfIn PDF document text
    • http://freeware-software-download.de/uploads/editor/file/48771075720.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/63086607299.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/wudivatet.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e04294a965---43562371569.pdfIn PDF document text
    • http://ordineveterinarivenezia.eu/userfiles/files/pirakiraxaruxugow.pdfIn PDF document text
    • http://www.ernakulamarchdiocese.org/www/js/ckfinder/userfiles/files/vafubusimavi.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090702302167724.pdfIn PDF document text
    • https://corcreation.twbiz.me/data/fckeditor/files/20210915_101220.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613bf5081a23f---50422383289.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16130ea1a605de---16965337679.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/zoxexedop.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/tobaxinafi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=mortal+kombat+release+date+hbo+max+timePDF 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_off0000b1eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1EB 10736 bytes
SHA-256: eefd2b83d5b7444e9ae3b8c7d4b4f8caadeb61fb0ca887f1c8f602b56fe2de86
font_01_sfnt_off0000caa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAA1 14736 bytes
SHA-256: d075ba9b67bedc2f2a510e13deca8e6adb218810ba756fa9f04647c7d8518d7d
font_02_sfnt_off0000ef85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1