Malicious PDF — malware analysis report

Static analysis result for SHA-256 d93f9c6faa4e776e…

MALICIOUS

PDF

79.7 KB Created: 2021-06-12 23:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a0e75a2b516eade902b7a7613e06bb84 SHA-1: 0f96d95da2bf23aa012baeb6dad70bce52bd47a7 SHA-256: d93f9c6faa4e776e9fd3ba1855a9e9e87bd04cdf0d672e3d13afcf18f4190901
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to search terms.

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://synerhu.ru/uplcv?utm_term=simple+mehndi+designs+for+legs+images PDF link annotation
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e70a6bdddb---28026701775.pdfIn PDF document text
    • http://edgecs.net/documents/88320778756.pdfIn PDF document text
    • https://boyanbolyarski.com/userfiles/file/93818070149.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/33360415644.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/abcb63a342674caa4dd33a9fb31b1f87/50620379972.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/saxasap.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5c938cacd---30663607797.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f0ab3a366---veripemi.pdfIn PDF document text
    • https://ajwatravel.com/wheelmarine/userfiles/file/17015207392.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/i509d3p46he0gpk0tvtv6g8vkl/88329719357.pdfIn PDF document text
    • http://szalkasszorutacskok.hu/app/webroot/files/content/files/lufemuban.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/t2356a1dsbfbpl5r25977me3ip/begurem.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a8544382e2d---sesavabebuvufu.pdfIn PDF document text
    • https://www.stjohnhomelessshelter.org/wp-content/plugins/super-forms/uploads/php/files/4f58edb75d951fb42ee4cea8a4cf411d/fobizozilogelusutubi.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/01f6f047c34f6b68ca47239699ade9fd/lufununaladajaf.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/26068514161.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/dikalasubagatozoja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fab4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB4 5560 bytes
SHA-256: 008c65d66a9491860f391676a4942d30c5a497b6159865036fd5299eb73420a3
font_01_sfnt_off00010d68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D68 10776 bytes
SHA-256: 0004a013c938f42f8a261dc69b047ff85b3bc1720071bdd4eed5115264370886