Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f794397984260c…

MALICIOUS

PDF

104.4 KB Created: 2021-07-27 17:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e68de7fa047c09ac4df20b561770250b SHA-1: a579620ae224c23a5999922990ac96d3b9660d93 SHA-256: b2f794397984260c6daf90c18f4e762a3dd5d2561fcad3e99fee5f4592cb6817
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal the PDF contains a link farm pointing to compromised CMS uploads, a common technique for distributing malware or phishing content. The embedded URLs, while some are marked benign, others are hosted on potentially compromised sites, suggesting an attempt to lure users to malicious destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160822c9082353---pakezurixirufomaferipi.pdf In PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9e4ef0344---jurulafuxofotikopositu.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609fa71965d9d---88806058129.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/55385912314.pdfIn PDF document text
    • https://burgas-remonti.com/userfiles/file/32927204377.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/iiuahssrc5q1k402fhsggvr046/lawadi.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/11923672801.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e3bce56e---19157779741.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/b7ed5a37801e8f6dad28c862a8a25ac8/vofatupenobarefuwobele.pdfIn PDF document text
    • http://kiavysocina.cz/UserFiles/File/84542762665.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/76797662362.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8f06072d659aad9a021521feef997a2f/79499129063.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a0103714f8a---ratebubeje.pdfIn PDF document text
    • http://etoprosto.ru/ckfinder/userfiles/files/tonudukiwojewisiweto.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/pamodomefinir.pdfIn PDF document text
    • http://skyline64reunion.com/clients/e/ec/ec378541aa9b73e2b99de5ca5545ec21/File/kewakuxafedo.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f10945fc4b---25191945012.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/34116294152.pdfIn PDF document text
    • http://meta-min.com/files/30878918376.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/88550775204.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6b5df2b384---55791861383.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c85e58e591---65361587921.pdfIn PDF document text
    • http://tragiaocolamsapa.com/userfiles/image/file/punukuruxonuz.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/39d09298799ec4576e69e4deef697b57/papukokekeke.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=difference+between+angiosperm+and+gymnosperm+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_off0001314a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014961.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14961 11260 bytes
SHA-256: 37b18d8b95a4630b6b73382d88a41a23ca2ae80df02c48ba9917a546c43cfbd7
font_02_sfnt_off0001637b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1637B 18172 bytes
SHA-256: ce4b994625d4b272a8c0d9ba02a40c62fcd8e0fdb1fac64af52728d8d5ec199d