Malicious PDF — malware analysis report

Static analysis result for SHA-256 b40bf96a5294abfc…

MALICIOUS

PDF

78.7 KB Created: 2021-06-14 05:20:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8e7786a2fc7d30290f701f0488c22862 SHA-1: e25a4942e5ce3ff73c56bdfa614e7dbc94336467 SHA-256: b40bf96a5294abfc632d2620627f250912a812006c201d19f7fac05770681e08
156 Risk Score

Malware Insights

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

The file is a PDF containing numerous embedded URLs, many of which point to compromised WordPress sites utilizing form builder plugins for file uploads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of 'utm_term' parameters in some URLs suggests a campaign focused on tracking user engagement with potentially malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://infrive.ru/uplcv?utm_term=ciclo+deming+pdf PDF link annotation
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7429030843---napagizadobib.pdfIn PDF document text
    • https://mfdesign.hu/files/file/9360675288.pdfIn PDF document text
    • http://xn--80aamdqpfpr.xn--p1ai/upload_picture/janubag.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160bb7b9a0baa2---60188596825.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/0671ce5127a433f22d0ce682c5945e7b/10497022929.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099ceedcc4fa---4454717658.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609d422c69167---voseduredojol.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/81d2796cdba77717da0b818989fed357/32803093686.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/87358f2a30a62ed49bd1a14c3cb8dd66/danajunebaramafid.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160752b4704617---bimifupi.pdfIn PDF document text
    • http://parkhigh65.com/clients/4970/File/3854772960.pdfIn PDF document text
    • http://davidhammerstein.org/userfiles/file/gebupakimibatik.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/b573d613ecad0cf16a0b57b39a82771f/wowosiwukuraxum.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/4928f3a88ef7b93a24a9df8719db243c/76933026687.pdfIn PDF document text
    • https://medgarlci.com/wp-content/plugins/super-forms/uploads/php/files/eb915eeeb09ad6544649fea8fe1a8956/90472879439.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE872 4724 bytes
SHA-256: f1f2959ff9acbf38ed9530b66d99d5fdfbbe8fed22791a8220f9222cdf8c4795
font_01_sfnt_off0000f861.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF861 11812 bytes
SHA-256: d67009c7223d8e86696aab459a37cac3acd43fb6907e21e2b752b3faf5a537fe
font_02_sfnt_off00011ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333