Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc52953b9f5986ff…

MALICIOUS

PDF

62.5 KB Created: 2021-04-28 20:36:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1a20fe9f5ac439875e957ae0b7a42041 SHA-1: 5f8d56dd7d8e0e58fabc394184ac1239423774b6 SHA-256: cc52953b9f5986ff6efe417f65fcf66253055766b294ce56d45de4d82d7ab27a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It functions as a link farm, directing users to compromised websites hosting further malicious PDF files, disguised as a USB adapter for carplay and android auto. The use of compromised CMS upload storage and disposable hosting indicates an attempt to obscure the true origin and hosting infrastructure of the malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8123

Heuristics 5

  • 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
  • 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://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160743df0757f7---67867813744.pdf
    • https://www.ideaklinikkadikoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850e45823a5---fubomadixejasixukolasam.pdf
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/f489c926bba06ed8d9734d65f1edcb08/2056299016.pdf
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075428f7f68c---31405646288.pdf
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608495f44ab02---68615563227.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/c65ba77f6c3c72ca29c24bcb8e376eb3/2823019829.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ee3d9408---fefenalogosabaso.pdf
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/d4hqe1dofj0fgubnoimrq1lvt3/tozutegex.pdf
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/36c824d127f0d6ca19dd10d9f4eef792/polosuwisejanivemo.pdf
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3f4a00601---zowipoxeniz.pdf
    • https://alshaabcoop.com/userfiles/file/kejenuzojekagopapo.pdf
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/b0446f656966e2d3322f45c1def1ea97/zuforoguvulamelijakirov.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cfb195fed6---31223041667.pdf
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/16078f1d4c2a03---1283160478.pdf
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/d90725dab4a168297e1ebe5d75bff820/36581177754.pdf
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/e9e28912d7770265067f5bd8c8c901a3/29658456653.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=usb+adapter+f%25C3%25BCr+carplay+und+android+auto
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da04.bin
56ddfc681b473c4f31edaa0df2498d42791339c049c4b5a8bd52da3df306431a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA04 5384 bytes

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