Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b634f52a7be088d…

MALICIOUS

PDF

64.0 KB Created: 2021-04-28 19:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c0e02af053afdf853020a5c82ca913d7 SHA-1: 0c4a59ed3acf035cf554a454b30cfb3a26bd02e0 SHA-256: 6b634f52a7be088dd659ba09844c67dda4835cafb947ba58447504ba98b05d58
154 Risk Score

Malware Insights

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

The PDF file contains a link farm hosted on multiple compromised websites, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of numerous links to PDF files on various domains points to a coordinated effort to host and serve a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9776

Heuristics 5

  • 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
  • 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://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/70t7hmerf7046dl2rik473isb3/61094622608.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/8c825f910b39ee605b41a36733e94b49/5910017044.pdf
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160801f99ee8c9---nugemitoxezofifinalabe.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607613ef6fcac---gazidibojagixadarinuvob.pdf
    • https://aartipalette.com/userfiles/file/82213352560.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16072f39697b52---mezapafososazajulepaxuto.pdf
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/364b5c638a6202f250c5772bac8dc8a0/gelatesimixuwujidemawus.pdf
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/0bc87472cc020a42ca274c71cf2b75d7/80557532849.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/00ca61741eab107983fdfca8678ffd91/20659708961.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084347f92644---88985288512.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160831a4360610---37557591416.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160796c7d043d3---vididafawavogadanizo.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/26f581f847ce62d1da9247fe83047076/52073460644.pdf
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16082c38cab3c2---salesuwoditoni.pdf
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/d1af394a4ebbaf9ade3ab580ef8967bb/gexirizufimokebijab.pdf
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fdpjo872vbpe8l548snaq3kqg5/vufevi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=robbery+bob+4+mod+apk+android+1
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc65.bin
3d8ec90c9f0067d6e9a9bd54476c5539a624d3cd4b959861f312a07cab71ec71		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC65 5348 bytes

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