Malicious PDF — malware analysis report

Static analysis result for SHA-256 06db8ac44f8db0c3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 04:44:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: cd16688b46569b405784f62f6d848b47 SHA-1: 5545226562af01ed997e37c6bb1f23f613756b8e SHA-256: 06db8ac44f8db0c388defd6c85ec599b6a8980573449bf233fa2ac7533ea3a72
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to disposable hosting and compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the heuristic firings point to the document's primary function as a lure to external, potentially malicious, URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://amsaneeraus.fi/userfiles/files/1458859104.pdf In PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/63798510339.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/lubumiwep.pdfIn PDF document text
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/16130f2975120e---27635010751.pdfIn PDF document text
    • http://mexvp.com/ckfinder/userfiles/files/24154782476.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/72b17df63c4c4c54f319def0ea44a65e/26555691170.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/gisitupuzuvomajisolape.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/61324095065.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613b29780a9d8---jepunipasoxawomejejubi.pdfIn PDF document text
    • http://getdol.com/page_data/file/75929437726.pdfIn PDF document text
    • https://shoppingplanet.ro/ckfinder/userfiles/files/29531687247.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/xorafezadixawul.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613245de91d2c---javojidixowadu.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/tekinofufugop.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/duwekunakusodurugapob.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_16_00_21_21_9833.pdfIn PDF document text
    • http://standardamulet.com/files/files/53356873834.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/68126799458.pdfIn PDF document text
    • http://gima.ge/admin/ckeditor/ckfinder/userfiles/files/jadagemijotujiga.pdfIn PDF document text
    • http://loscogliodifavignana.it/userfiles/files/10635226369.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/83740895322.pdfIn PDF document text
    • http://tea-ra.com/user_data/upload/save_image/files/23522589811.pdfIn PDF document text
    • http://ieeepes-thailand.org/app/webroot/files/files/73328200228.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210912191946_646538.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/fudonarelo.pdfIn PDF document text
    • https://anitacalderon.com/ckfinder/userfiles/files/fusazigazebem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=soulsilver+walkthrough+guidePDF 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_off0000d87a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87A 17756 bytes
SHA-256: c310aa69add1ae18c9e0d862bd086071dbc11fcc2bd57d1713c74eae014a463c
font_01_sfnt_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 10844 bytes
SHA-256: 6eda64975ef7861c7e3964d2319b6cccc55be82821a6698f6835c61afa4e8b3f
font_02_sfnt_off00011f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1