Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f05c54d90c206de…

MALICIOUS

PDF

68.9 KB Created: 2021-09-12 08:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5828b8291310b60a639c1bb338c748fc SHA-1: fbbb32c4a978e8d47d791c7dfe30305b8df5aa8e SHA-256: 0f05c54d90c206de442e1ff33f6e33c4c6bcda011acdda8b1d5442bb8897a55d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various websites, many of which appear to be compromised or disposable hosting. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a link farm on disposable hosting, and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM points to compromised WordPress uploads. These findings suggest the document's primary purpose is to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://irlanc.ru/uplcv?utm_term=imovie+download+android PDF link annotation
    • http://bulgankhangai.mn/userfiles/files/pajexuzutore.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/b0641d3faa98025f8772e6db87bd06ee/20231813574.pdfIn PDF document text
    • https://angelsolutions.ro/ckeditor/ckfinder/userfiles/files/27566834176.pdfIn PDF document text
    • http://www.anieliasfx.com/uploads/textareas/file/65311390679.pdfIn PDF document text
    • http://rmgoals.com/userfiles/files/93368916316.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3ec34ad4f---59568096669.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210906233838.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-11/20210911013600280518.pdfIn PDF document text
    • http://tindangnhadat.vn/upload/files/27338090436.pdfIn PDF document text
    • https://mudrun.com/home/mud/public_html/ckfinder/userfiles/files/dixopabapigovef.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/49633377622.pdfIn PDF document text
    • https://cakesandcupcakes.net/userfiles/files/91438563015.pdfIn PDF document text
    • http://na-bytecek.cz/UserFiles/File/nuvamabakomifate.pdfIn PDF document text
    • http://hzkontejnery.cz/ckfinder/userfiles/files/zafipoxelotesupu.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613778b1c67c8---nabiwe.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/pilolalosurelatidogabelef.pdfIn PDF document text
    • https://ita.kru.ac.th/ckfinder/userfiles/files/96535332973.pdfIn PDF document text
    • https://wangwangcamp.com/uploads/files/202109082153288067.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/tewafusafunudadetiboti.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/7df7d88b353fd463dcb30dd61fcebe5b/88007882621.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/33722480914.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/9355334316.pdfIn PDF document text
    • http://hk-keber.de/images/file/wosaxasupofabu.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_off0000b2b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC3 14580 bytes
SHA-256: 0c1cbbf5dd5770b62f09b63f69f417923b540a44d4c913d26f858f79b823e228
font_02_sfnt_off0000ef0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF0C 10248 bytes
SHA-256: c6c253c4499c2a9ccbf111b1e92dbe7cb20223a7cb6931600c18de40210c17d9

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