Malicious PDF — malware analysis report

Static analysis result for SHA-256 411156d4d19e4345…

MALICIOUS

PDF

83.0 KB Created: 2021-09-07 12:55:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5cd77c646b67f68390262a455eb8c179 SHA-1: 8f54e1c3edbffa1afdd518ff5ac74ed356ae386d SHA-256: 411156d4d19e4345ec04ae044b139aa0a8b38924bdd1196a9dffc9bf0ebaa2dd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF contains numerous links, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://westmoorclassof1965.com/clients/5/52/52ec68f2b927accf75267cb07bfcc891/File/16782944775.pdf In PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/nafurusifatumogetidulas.pdfIn PDF document text
    • http://land89.com/ckupload/files/67352763651.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e80c600dfe---25901299047.pdfIn PDF document text
    • http://the100voicesofgospel.de/fichiers/newsletter/file/miroz.pdfIn PDF document text
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/mr3645otl4u5brv2bhq3odq4el/8553296556.pdfIn PDF document text
    • http://schroniskoorzechowce.pl/ckfinder/userfiles/files/pimikefupuxeku.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210629_AD37E04461C6057D.pdfIn PDF document text
    • http://pincailight.com/zk/UploadFile/file/2021062008274473499.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/6675a46a3cfeda5737ab4a418cb15259/79823423382.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160ab619294581---jamugafafuxanujufu.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/0ec43e5dc6402ae13fdaaf01399992e2/22102956989.pdfIn PDF document text
    • http://nepalbestcargo.com/userfiles/file/86337003774.pdfIn PDF document text
    • https://fairtradeportal.pl/userfiles/file/watuxufuzi.pdfIn PDF document text
    • http://tz5168.com/uploadfile/image/2021/05/30/file/20210530_033045_128.pdfIn PDF document text
    • https://rintrans.com/files/18678001672.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/af3825084bcec376e89957e65c96c724/28333799654.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd1135a816---gunutobejidofoniwefop.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/pomok.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pipubedekorotumepi.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/razogaxuxip.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/givisij.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/jegimuzudu.pdfIn PDF document text
    • https://suavitinhtannha.net/upload/files/842715384.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75494eabe3---febegozupebojapifokemexa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=conceptual+physical+science+pdf+freePDF 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_off0000dc87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF499 18344 bytes
SHA-256: 3a43c8500762e00db83a1920e1a60c3ed7f2215285bd310bd9b48dc2ac9a6b4f
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 10960 bytes
SHA-256: 6cb71866b9157e51815cffd3aca5c399c1f6fa2fc8fad3a8f5c11a6ba238753a

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