Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef143ce7f9fc4d2d…

MALICIOUS

PDF

78.0 KB Created: 2021-06-19 08:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9a2796f523fb8e3d9ea8fd1fde4447c SHA-1: 5d59469f0e8f3edd227f31a098f58cfdc1976452 SHA-256: ef143ce7f9fc4d2db7df2e460e78cad60658c12b421243b2c18f7d622167dda7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6547

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://whkmradio.com/userfiles/file/72389855817.pdf In PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/7c0ec9bfa6aaaaf38ac8ffe410f4f083/55301215689.pdfIn PDF document text
    • https://dbmotorbrokers.com/userfiles/file/96655574497.pdfIn PDF document text
    • https://postelezmasivu-ostrava.cz/ckfinder/userfiles/files/fedax.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abbf2cb6d37---tipulukaserefowevakeb.pdfIn PDF document text
    • http://notarbrazda.cz/userfiles/file/jopugutowed.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/iq1fkdrb4l9tkeerjnc05g5377/nemuzisivekubuwazifag.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/8285006060b92c5ea23d3.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a748048f808---26484226297.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/9171140122.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/35658880657.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/1535ug9klnv3bmqd78h1du35d6/57485264647.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/44596627400.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=indira+soundarajan+novels+pdf+free+downloadPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000fa68.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFA68 21244 bytes
SHA-256: cf734d6b43b699cb4fbf5db374827d16683b4630db0c2b905516bded13c2439e
font_00_sfnt_off0000e897.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE897 5200 bytes
SHA-256: d8d339708433c803484c12fb6d6d29b0eea269a258d6c0c3a2755d19582b34d6

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