Malicious PDF — malware analysis report

Static analysis result for SHA-256 96e16b4ff54f6eb4…

MALICIOUS

PDF

78.1 KB Created: 2021-09-03 23:50:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 810f2087ebdd672f0dc9cbf3285013e9 SHA-1: 4d1cfcc5c60bc1d3ce22bc0d3c6f52b5655af8c2 SHA-256: 96e16b4ff54f6eb4cbe8c512d6fc28993142f8d41276eb1e9757f9cedb4d5058
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The primary purpose appears to be directing users to external resources, likely for phishing or further malware delivery, consistent with a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://mesahighclassof63.com/clients/79820/File/tamovojok.pdf In PDF document text
    • http://gursakaryahukuk.com/images/file/saferodemukaviwuxi.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086e932e5c54---memisopaxutan.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/ladovidiru.pdfIn PDF document text
    • http://kath-kiga-bw.de/bilder/berichte/file/50272126385.pdfIn PDF document text
    • https://luyenthitoeic.info/userfiles/file/ponosegivazezonivoras.pdfIn PDF document text
    • https://gs-hemeringen.de/ablage/userfiles/files/subabuj.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/2c9a5a0fe993b36aff6b18ed6cb1b8e0/91826914616.pdfIn PDF document text
    • http://ovartec.com/wp-content/plugins/formcraft/file-upload/server/content/files/161292bfbe74af---kazaximikisan.pdfIn PDF document text
    • https://agentcctv.com/userfiles/file/72920626384.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/a34cec04810190de3d755cef4b7ad6b0/51328596960.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e96c84a53---wuxuwerotapow.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/5a2b9a2301faa95585fa0898b0a61c1e/favutusu.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/lupolosudirolutowifepokup.pdfIn PDF document text
    • http://idroter.org/userfiles/files/zomufepulepukukonusezal.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112df3b52955---vowaxekezijimudaxu.pdfIn PDF document text
    • http://toyotaquangninh.org/data/dulieu/files/42754862596.pdfIn PDF document text
    • http://voijin.com/userfiles/files/47341613639.pdfIn PDF document text
    • http://ponderosaclassof1990.com/clients/d/d5/d5d19f6fc184e1fdd834fc62be9f1763/File/panilenanu.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/61689a4d8665c0f7ad8932825e50d86b/lafagisesuzitubisaxop.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/80875666817.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/rozuv.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/mufamidadilototozexor.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=prosedur+loto+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_off0000cdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FD 17416 bytes
SHA-256: 158b29c5fa504a56fe9d5969c5a0659cf9b4ebb08267ffd1d35c82bc83243ec3
font_02_sfnt_off000113ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113AB 10232 bytes
SHA-256: c17277dc0c9e41865cb7429bce086cc9b1f6e40d2d2e13a3ed93dd0f83a3d4bf

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