Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb3c4e82d23b3d8e…

MALICIOUS

PDF

83.8 KB Created: 2021-09-04 15:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: fdf62ab8419702b1f239480da0c14eda SHA-1: 846d801262f4f12ceb906631c0bff5865529e327 SHA-256: bb3c4e82d23b3d8e8060821cfa3367838b9308f38907bdf37c79c61a1e2d9921
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • 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://ascensionchina.com/userfiles/file/7945656556.pdf In PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/zumezekigowudaroga.pdfIn PDF document text
    • http://qiangka.com/ckfinder/userfiles/files/13760912169.pdfIn PDF document text
    • http://ipost.mn/ckfinder/userfiles/files/nuwunogag.pdfIn PDF document text
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2971277aa---47528191207.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c874a546c2---31163898861.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608907d881720---10885656438.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/gewunobeseso.pdfIn PDF document text
    • http://aurora-c.jp/files/files/mekebomolakuta.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/39078766869.pdfIn PDF document text
    • http://fresh-j.info/images/uploadedimages/file/dubazelitime.pdfIn PDF document text
    • http://lyzebrno.cz/userfiles/file/86963450242.pdfIn PDF document text
    • http://watthaistuttgart.de/userfiles/file/xifogepirap.pdfIn PDF document text
    • http://iberia-ex.com/images/blog//file/lerubemefeliv.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/pkdu9jrftdea6msfsnqi6voum2/78946983851.pdfIn PDF document text
    • http://longbienco.com/js/ckfinder/userfiles/files/zozogopakojominusugijakuk.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/fe69fa77a6b10ef20b65bafaff8869a7/jevezubibaxipafafafofatop.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/mekuzutelediwujikoze.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f18ec9cd5---niginalaxudinufo.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/lofokosifaxozo.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/6min8v8jghi61q8fj3fpa9hf2q/95589057177.pdfIn PDF document text
    • https://spitalmoldovanoua.ro/ckfinder/userfiles/files/57741596954.pdfIn PDF document text
    • https://dauglita.lt/components/com_mijoshop/opencart/image/data/files/finidewidenavu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=contoh+skripsi+teknik+informatika+berbasis+web+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_off0000e1d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1D8 17908 bytes
SHA-256: abd2ae961c59fcd323ec68c824c3f048643370bfa558fceab844e31647a320ff
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 11064 bytes
SHA-256: b489aaaa397f57018f23952bc101cef41c0f507be1207982a8f3516502f3a4d4
font_02_sfnt_off0001290d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1