Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6956d9c2b441c36…

MALICIOUS

PDF

70.4 KB Created: 2021-09-29 10:32:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 08a536755090cf09a8269d7718cb0dc2 SHA-1: 1292820442638832d47e3a2fa777b442ab1fa96b SHA-256: d6956d9c2b441c36312ee4a492b0e6695f4054e540c712d66f9b1172931706eb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript suggests it may be used to further obfuscate the redirection or initiate a malicious action.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/34350280945.pdf
    • http://keyflounge.nl/userfiles/file/96626327255.pdf
    • https://kultmotor.hu/images/files/97165687799.pdf
    • https://malashealthcare.com/userfiles/files/motezemefupok.pdf
    • https://ibshospitals.com/userfiles/file/78003441100.pdf
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/74134441666.pdf
    • http://colleges-in-tamilnadu.com/FCKeditor/userfiles/file/90892722649.pdf
    • https://www.vpn-solutions.com.pe/ckfinder/userfiles/files/77218261905.pdf
    • http://opusincertum.it/userfiles/files/sivevowimuxizunilajid.pdf
    • https://marblo.ph/app/webroot/img/files/revub.pdf
    • http://yangpupark.com/uploadfile/files/nawaxixuseroxegenabopi.pdf
    • https://laser123.com/geektic/files/26253858668.pdf
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/83db46b80d052719342b240564d0f1c7/64781385191.pdf
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/vrcgfft5515f0t0v5llhf6tgg4/11390292512.pdf
    • https://fnb-concepts.com/images/uploads/files/3605884849.pdf
    • https://alcc.c-zentrix.com/ALCC/mail_attachments/multitenant-ws-01/1/1631553343.pdf
    • http://clingac.es/d/files/61597093725.pdf
    • http://mackyz7automotive.com/js/upload/files/kafeju.pdf
    • http://msci.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16133d77f1ef74---vegizurigakigumikujusobal.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/lamowimalifumopotifu.pdf
    • http://elitvorota.ru/f/file/81260208717.pdf
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/wijudegux.pdf
    • http://ride.hu/images/uploads/files/lidaxawokuxoxefiluburijet.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f62b3c1b87---77068482312.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b683cca237---41842927217.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=come+realizzare+una+app+android
    • 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_off0000b278.bin
750214d38bf7aa7cc7d1bdd72ee90a520b944a56fa0c3f307893bda79ff9fec7
pdf-font-stream PDF embedded font (sfnt) at offset 0xB278 10476 bytes
font_01_sfnt_off0000ca2e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA2E 16792 bytes
font_02_sfnt_off0000e240.bin
d08ca8ba7d98ba8523b21b17521f86d7a99fbb1cb7d15d03cf40c1ba74621077
pdf-font-stream PDF embedded font (sfnt) at offset 0xE240 16356 bytes