Malicious PDF — malware analysis report

Static analysis result for SHA-256 68a64cfb5a783a4e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-01 10:11:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2dda681576267942b808c712da54ec76 SHA-1: 9d57b13701b7fbf448c15a1c6fefbe2782df2cc7 SHA-256: 68a64cfb5a783a4e5fd3975d90dfda2235a5fe94d9d33c0a7b47395e023751a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised websites that host further PDF files. The presence of multiple links on disposable hosting and compromised CMS uploads suggests an attempt to distribute malicious content or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071503c4c159---jexebabajokigil.pdf In PDF document text
    • http://bogelaipigeon.com/upload/file/95790313462.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/parikutufibobud.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a97aefcab77---26741363964.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lacgd6c8r7rsimqveo1p85am3v/53833083990.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/7118d55994f18561f8493e55ca18d113/tutamafiwibasuzinap.pdfIn PDF document text
    • http://abwingsmd.com/uploads/files/21511458143.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c043666cd1a---fariluxakepevigude.pdfIn PDF document text
    • https://parokisantolukas.org/Uploads/userfiles/files/xonoxenetemipufop.pdfIn PDF document text
    • https://coffeetuanvang.com/Images_upload/files/47094106974.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4590ba12dd---486015056.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16074b2ce2c9cf---nudurisulawav.pdfIn PDF document text
    • http://ya-ke.cn/admin/upload/7756815160.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/k44683dgqgcgb18kvd6kd0sdg7/8115818162.pdfIn PDF document text
    • http://www.korayozelguvenlik.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c004e8394---jefajememogovuwevadev.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1622421042.pdfIn PDF document text
    • http://agriturismofattorialucciano.it/ckfinder/userfiles/files/bopipof.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/162648988562626091026.pdfIn PDF document text
    • http://lactopad.com/uploads/files/19788201753.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/2bcdhnr85nucvg9j81t8p5bgv0/renenibenu.pdfIn PDF document text
    • http://dytac.hk/userfiles/48049346392.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/16005296107.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160f389a23c799---wapipolakaromak.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16098758b80489---95106497355.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=chart+for+diet+plan+for+weight+lossPDF 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_off0000ccd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD5 10896 bytes
SHA-256: 41a1a92e366e97bb241a4c41a2deb96a593ef63f73b392590d15f205e1a6f818
font_01_sfnt_off0000e5d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 16980 bytes
SHA-256: f7f3f25f1238d7c973f70abef26ae037722d8f61f570fc5c4b18fc26c1884b34
font_02_sfnt_off00011105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11105 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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