Malicious PDF — malware analysis report

Static analysis result for SHA-256 d17900dcc9cbc8ba…

MALICIOUS

PDF

85.2 KB Created: 2021-06-29 05:13:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ebc576549ec5990163efb5722ce1700d SHA-1: 2604d24507a9a891c63657e20cebec317b17e24b SHA-256: d17900dcc9cbc8baac01dbf70bfa1ee58c23db924e5ae5a614d7c1ad5e0f47f3
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting, suggesting an attempt to manipulate search engine results or host phishing content. The primary attack pattern involves directing users to external, potentially malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://unicaconsultoriarh.com/images/files/40925625894.pdf
    • http://www.franklinwebdesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a58180260b5---41816488847.pdf
    • http://myjobcareer.net/userfiles/file/2021062510501373499.pdf
    • http://volamtuyetthe.com/userfiles/file/nasutararadoburapuloxom.pdf
    • http://hzbmsj.net/images/upload/File/pavezalifigutupifufedenog.pdf
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/06a650509055c3f921e5a3de1323ccc3/rezijamivolariwu.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7abbd71e3---8371290711.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16081e4eb11e13---jiravagufiwavezabujeb.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/9af16cac0528ba895182b9f31f8beb8e/1240997691.pdf
    • http://aarogyamedico.com/userfiles/file/57251364445.pdf
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b9f586c13---lelut.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160895fb43b4b7---mipazaduberirugusoros.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/mebewovoduruf.pdf
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3f70bc651e---11099334979.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/a3b9c16cd3805ae855bc63dd0ab260f5/7980769379.pdf
    • http://baikalspring.ru/ckfinder/userfiles/files/30595642617.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/e3f0dd145c4f4c452fcf4ac0b9fab829/paxonugazotudazuko.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4af9d6fc4---fumodikuvaveragolepiz.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/ldajddosmfnrse7si05g8b277l/jokuritepadumedemigip.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609661d1da328---mogigumifowize.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/50bbccda503e1693b0c650120658c21a/39324866546.pdf
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/1fc1ee2af8ecc2db79e46dab5c11d87f/50818422631.pdf
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a67e9932f9c---pugisewokabasuxipun.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=what+is+organization+in+essay+writing
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec21.bin
b50a1a686f660d828993782f5578f956992b7ffff9840a441c94c2dea287ab3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC21 10596 bytes
font_01_sfnt_off00010475.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10475 16792 bytes
font_02_sfnt_off00011c87.bin
55647e73baf5b17645b8b261cee851d029d5e93ad7d0acafe743b6421a081823
pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16644 bytes