Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3646d0aa0f299c0…

MALICIOUS

PDF

69.6 KB Created: 2021-10-02 05:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b67f9dd33bb9f68b1c1ae164fc62471d SHA-1: 8d3e7ec84220761ed28482ce9d61369def18ea43 SHA-256: e3646d0aa0f299c01ed537ceb72f15b41fad0b299ce9a649e100bf4c1ba1e80f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, and the presence of 'utm_term' parameters suggests SEO manipulation for phishing or malware distribution. The file's structure and embedded links strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • 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://coretry.ru/uplcv?utm_term=microsoft+office+2010+crack+version PDF link annotation
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/8080666e46d211aa7a048ed8521eba78/fakimanufejoriwo.pdfIn PDF document text
    • http://ks4073.com/file_media/file_image/file/kafagerinewelusaroduzij.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/mifuvutuwitimite.pdfIn PDF document text
    • http://chenruichem.com/upload/files/fixodibitivo.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615660fe46730---joropegixuzuwuwe.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210926_39DFBB55B8CA6130.pdfIn PDF document text
    • https://y3stwk65l-mn9.com/contents/files/22605750964.pdfIn PDF document text
    • http://eau-msu.ru/ckfinder/userfiles/files/fekibalebinexotufujixok.pdfIn PDF document text
    • https://xn----7sbbg1ddpkdc.xn--j1amh/uploads/files/98981966977.pdfIn PDF document text
    • http://sola-brothers.com/userfiles/file/dugikom.pdfIn PDF document text
    • http://c-amc.com/upload/files/84501060843.pdfIn PDF document text
    • https://topclassgardening.nl/images/file/jasisojipadagu.pdfIn PDF document text
    • https://ckfinder.pamlskovnik.cz/ckfinder/userfiles/files/teravijovemarukimurujos.pdfIn PDF document text
    • https://liho.cz/UserFiles/File/57524240843.pdfIn PDF document text
    • http://matras-devison.ru/upload/file/18399149485.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/salekesorumuzigapepalix.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/bapuxi.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210911212454.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/belifebaketura.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210912224957.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161393e7656dd4---bovativev.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/62994672453.pdfIn PDF document text
    • https://cosmopolitanhotelbg.lastrada.bg/uploads/wysiwyg/files/bofasarokupoboj.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/63251651494.pdfIn PDF document text
    • http://mamtomchabahai.com/uploads/files/files/7441551589.pdfIn PDF document text
    • 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_off0000b11f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB11F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c931.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC931 15120 bytes
SHA-256: b49aa65c33f6e665f69ba13f155a7e5c4329df2de041f4dd3ab70b98a9e5ac23
font_02_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 10728 bytes
SHA-256: 1bf3582eca421419c927e935fd1f96025ff8b14da1aa9c38ebcfa6363a9faa9f

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