Malicious PDF — malware analysis report

Static analysis result for SHA-256 c51d1caf6d048134…

MALICIOUS

PDF

79.1 KB Created: 2021-09-01 21:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: c68f6a754ff6ea3fb4d79ef594659c52 SHA-1: 1b0875e8007c5b0689a6a215abc3f929a8d7ad5c SHA-256: c51d1caf6d048134476e38c27e2e15e4a56e5838c890d61a37aba35789fc4744
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious. It contains a link farm pointing to numerous compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of external URIs and the nature of the link farm indicate a redirection mechanism, likely to a secondary malicious site or payload. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://oniceh.ru/uplcv?utm_term=beer+onions+for+brats PDF link annotation
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb8495b061---moneneforokiresatezulofa.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcadeb3d57---benadugupopolopupobuto.pdfIn PDF document text
    • http://fitviewer.com/files/file/nuwejatiravuxifukobatet.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/473be18520a32d1af76ed5d42348e51f/21268104378.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/7abd530c582d86db00e432cab3787388/28418490046.pdfIn PDF document text
    • https://kodeac.com/wp-content/plugins/super-forms/uploads/php/files/g4s3ta49jft9kjpl9sg37br6r2/nolezepu.pdfIn PDF document text
    • http://protok.pro/upload/files/23200684265.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/p3dmevq6uteponpjcbom8dqkn1/52207319973.pdfIn PDF document text
    • http://klick-tipp.at/ckfinder/userfiles/publics/files/26285913176.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079d97786ca4---resisavapidafebofadisoz.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/csfa9ja5d6668813vc1ran3bme/taboledabewilumo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/13ss0k64lcusij7to0edg8jjj5/nivosekexiwoxanoje.pdfIn PDF document text
    • https://medsplus.us/admin/images/file/80756535967.pdfIn PDF document text
    • https://greenvalleykerala.com/ckfinder/userfiles/files/tivuko.pdfIn PDF document text
    • http://inglewoodreunion.com/clients/68690/File/mojavabodokinofaxedewuf.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9a487e703---69446373034.pdfIn PDF document text
    • http://polskienarty.pl/data/aktualnosci_imgs/file/mefisubikegorolanagom.pdfIn PDF document text
    • http://sistarelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/28481414248.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/86439927063.pdfIn PDF document text
    • https://brothers-music.com/ckfinder/userfiles/files/81894965336.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/9cf5f9cccf887745a0ef461a9893bead/76332428157.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607dd0cdf0282---94928010204.pdfIn PDF document text
    • http://hk-dcc.com/wp-content/plugins/super-forms/uploads/php/files/80k8bmfnt3f2kc87fskrbhr053/tutulofoz.pdfIn 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://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_off0000d27a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD27A 17340 bytes
SHA-256: 68aac9ac70a02149a68198e291b524fb3813b6c5217b9b508193d60b6e730820
font_01_sfnt_off0000ff81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF81 10352 bytes
SHA-256: b719b0639ea299c47a3b9b4b6ed948b486bf15591a0821f5e093861bd9f97ff0
font_02_sfnt_off00011711.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11711 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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