Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f98cfa48effd5fa…

MALICIOUS

PDF

69.9 KB Created: 2021-06-08 05:45:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdba41a5d83153e3fa3cf2e4fa0a88be SHA-1: 969c3918623bb16d21abc87021e8ee2ad21145f5 SHA-256: 2f98cfa48effd5fad99b5588683c49d193752040083843c8666d6055fc5af361
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity.

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://pistant.ru/uplcv?utm_term=what+happens+if+cubital+tunnel+goes+untreated
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/293ad6f12346c9732f159f9e0a96119e/wosukawasapafaferef.pdf
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/ls01u53do7mngddsc9keidm7u5/mowupijuvokipu.pdf
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2d2298e28---18681186679.pdf
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cffe13a922---73322222938.pdf
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/bqkc2vkrsgq3gdn0plh534itsi/76523225342.pdf
    • http://salon-urody-bellis.pl/images/file/17240255774.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab06db31eae---livat.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f0fa679bcb---kuronejifirebasemajavobeg.pdf
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d276692acd---datemuzuxir.pdf
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607462c556c5f---84753042614.pdf
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/57c0d1ac1ed522f43b7f6270bc268702/furuxuresabuso.pdf
    • http://babamoleskine.com/files/file/derogemenidugixedovefera.pdf
    • http://humanitool.ru/userfiles/file/90845361746.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607aa7996a08d---54042009139.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/2u3bmmcnof1ekqa3jlj94iu3q2/jizip.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_off0000d534.bin
a1eee13cdfae8903e49a148e12c6adc0667f1e8efe1293e1b7a7da92797a7918		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD534 5568 bytes
font_01_sfnt_off0000e824.bin
9d8eca6565fcf499e806811b9e4d4ca6f881e4c48e7cb9dab40464c40060bc30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE824 10152 bytes

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