Malicious PDF — malware analysis report

Static analysis result for SHA-256 16a571327d3a811b…

MALICIOUS

PDF

72.3 KB Created: 2021-06-14 03:16:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a92e50ea01f519993faf2a447eb5331e SHA-1: 849bcdc5fb6bb683906ba4adfdc6cf4bafa98b82 SHA-256: 16a571327d3a811b8c1e4a15dd5246c38fb5f77b3563c02904ea8e880b2347e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 https://wastran.ru/uplcv?utm_term=phineas+and+ferb+last+day+of+summer
    • http://paillasse.hu/userfiles/file/40862149457.pdf
    • http://abacusnancy.com/userfiles/file/48342186009.pdf
    • http://c-amc.com/upload/files/jegeboxi.pdf
    • http://agiusfuneraldirectors.com/files/file/15226241151.pdf
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d67d50cf20---90404414218.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a8a2f080a---48951968457.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/92768af5dd07217ec8f89a35db07937e/timinizuv.pdf
    • http://chinajessie.com/seadata/data/uploads/img/file/162280461743.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f175eb7117---fabadotil.pdf
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160792dbbae1c1---lufiboj.pdf
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/d4f5e1593ad2494c0da7e262b703d49b/24517939282.pdf
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/i89voc3p4k4gvsfd7k01g1834f/10540955068.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/a01ecfbd306a2f618dbb3d6d60188330/65524001603.pdf
    • https://egf.tw/test2/images/file/padijareginibesat.pdf
    • https://monacollection.ua/wp-content/plugins/super-forms/uploads/php/files/34393e459dd828147dc055313bd07e04/79614038210.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbd3.bin
a930ba6fc9b5c16ba78def82669c85bfa6922e84c2c0839ff2c4855bd63013ca		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD3 5392 bytes
font_01_sfnt_off0000edfc.bin
e395b2043f3b15403bcf5c20dd80d6867187fcc73229eff23c1aa608b585842f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEDFC 11328 bytes

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