Malicious PDF — malware analysis report

Static analysis result for SHA-256 b82f87b75ba0caa6…

MALICIOUS

PDF

72.2 KB Created: 2021-09-04 02:04:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ac94e9bceb198c221b5cd805d723fb65 SHA-1: 8849727a295ae4979839ecae0de6a042cab98e10 SHA-256: b82f87b75ba0caa6cad544ece51ca20e3560216f3a6b3e6c8fb1bf7d15ca2fc0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611afbcc7b20c---lexizojuluzuturo.pdf In PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac56c31764f---gudil.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/f6a42a9fef45c0018c095a41b0f63533/2017253037.pdfIn PDF document text
    • https://galedo.cz/www/data/cms_files/files/liwisopowebabimokejif.pdfIn PDF document text
    • http://a-xian-coat.com/uploads/files/202108311329426437.pdfIn PDF document text
    • https://blugarden.eu/file/fimijepojefilopurebit.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/25992296849.pdfIn PDF document text
    • https://hoanghaie.com/Images_upload/files/dezexulipugobowowok.pdfIn PDF document text
    • http://goldenrulelodge24.com/clients/860883/File/towabodaxu.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/53752075090.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/pixisivojowigora.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/16626714819.pdfIn PDF document text
    • https://andrejc.si/files/file/popetu.pdfIn PDF document text
    • https://speeddating.lt/speeddating/ckfinder/userfiles/files/55167928870.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b39d2fb6---zeduramikodom.pdfIn PDF document text
    • http://brilspa.ro/userfiles/file///zomafe.pdfIn PDF document text
    • http://jullien38.com/ressource/site-image/files/gutule.pdfIn PDF document text
    • https://247christianity.org/fckeditor/userfiles/file/mipawudizafamimibofapo1621169299.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/94838253783.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b375bfa0de1---gujolomowani.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/126910cb8a84e5446b403dbcdfe6e649/kojukopavixuxepofezajo.pdfIn PDF document text
    • http://marchmont.ru/imgs/file/pozufenegedudotoni.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/mimedoreziluge.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/bavcf9qg9vstl0acm51ou50ihn/91108070646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=different+types+of+shrubs+with+pictures+and+names+pdfPDF 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_off0000b82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB82C 11280 bytes
SHA-256: 73ca5ab3bbf8bb93c921d8d1290bf88a009b57035b27e576315dd5053d3d682b
font_01_sfnt_off0000d255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD255 15748 bytes
SHA-256: 77b23477e87a7642fe819287cf5ae2196fd531777788252d0021dee45cf042f2
font_02_sfnt_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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