Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3fd5e55c4de5f57…

MALICIOUS

PDF

90.8 KB Created: 2021-07-04 13:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2ae922e508b172cd82a1e81aa06efd21 SHA-1: 77973d449bb9d850defdbe4abdace945da314b6e SHA-256: c3fd5e55c4de5f576bfad545810b96c41d8932273b9cda12a6b2a709597dbdcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://synerhu.ru/uplcv?utm_term=2+raised+to+the+power+2
    • https://muratay.nl/userfiles/file/94696963874.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/lcb7fhksnpf05j6jlusnk4t411/88884895159.pdf
    • http://aven.su/userfiles/file/95149028813.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072f72823cb3---zugalezegavivagife.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16086f29952abf---pomexujigerewa.pdf
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b87c439d4df---15131695762.pdf
    • http://aryajob.com/user_upload/file/14616889471.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609c23620183d---togofaropotawalosimogagu.pdf
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/n0iurkipi8klcejhk30o4ovhfp/84095533132.pdf
    • https://promise-land.com/upload/file/bajobadopagigad.pdf
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/wixokolegap.pdf
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2ae43df2ca---84675292371.pdf
    • http://studiopol.com/userfiles/files/babeluvasubibosuzufugoviz.pdf
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/16073f35c67542---21811126145.pdf
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a57deb6e933---fotagufa.pdf
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/6bt11uivvk8tuk3ui8m3d3di2e/gavisijeriv.pdf
    • http://rosabaum.de/web/editor/files/watawafabi.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac01c1946ff---40631483994.pdf
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ab370ea82---86150002395.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe08a4df4---bawoxuwirurarixesapebiru.pdf
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ce79505f4a---sopajozasaserezawiz.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160c5f3743823c---53206923597.pdf
    • http://richmore.kr/uploadfile/fckeditor/file/fodewaduvetolukabebiloki.pdf
    • https://akproauto.com/nbloom/fckuploads/file/12243485318.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16082fa8e3ce8e---23409450205.pdf
    • 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_off0000fe7b.bin
67cab52c08839af036637cd5a4d12cf0440ad9c9d36e10f68b1ae5c45ed8a7ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE7B 10448 bytes
font_01_sfnt_off00011671.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11671 16792 bytes
font_02_sfnt_off00012e83.bin
51eaa5cd69800c51ac9cdf6da72fe77367c88e8f956e09f7e774ef8e099a4983		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E83 17968 bytes

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