Malicious PDF — malware analysis report

Static analysis result for SHA-256 b095f4008dc5d94d…

MALICIOUS

PDF

72.3 KB Created: 2021-06-15 21:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f78312b4828dfa1c0ec893bf9a9674b SHA-1: b598e12f3dc95691a071acc1b2ae8dc5a56836fb SHA-256: b095f4008dc5d94dbfc919e08b66a5573c75341975e40db62cdaa1e33798d5c2
154 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9747

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 https://queure.ru/uplcv?utm_term=instagram+video+to+mp3+audio
    • http://xn--9d0b102a6wc3y4a.com/sa_upload/userfiles/file/20210521191508.pdf
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/ecb8679209db911d3182fd0f6484f1ba/35413646847.pdf
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/c1khmal7sdgpir10crnt7er5lr/tutulopu.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4c6c3996ae---konipo.pdf
    • http://ahxxzx.com/userfiles/202104/file/modafasavidakozifebaw.pdf
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/e03bda32f77debe250f5859165aea892/fokerage.pdf
    • http://yeosingol.com/FileData/ckfinder/files/20210610_66B7E3D59F836CEE.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6884f0b31315d51152e3e84d95959f87/53091555742.pdf
    • http://stjconsulting.it/userfiles/files/43856721345.pdf
    • http://eugensa.lt/app/webroot/uploads/userfiles/files/27520488161.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c3ec66a885f---rarupaw.pdf
    • http://clearlakesd.org/wp-content/plugins/formcraft/file-upload/server/content/files/160728827f16c4---jatujaxu.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/8771e5917fd40498e5d8e5d90db3fcc0/bibumu.pdf
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094688663336---bixireruxojuxenar.pdf
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/2840773980a57c42d21e67469cef1905/10860864860.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/918c56d8a004f38dec4e6853f19197a0/vusubomemisuxorime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb84.bin
1d6f8c6dcdeafd76e36f972ea1b339d390971b5bd6c4e80409a77e955fe585e3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 5408 bytes
font_01_sfnt_off0000fde0.bin
7a0a9d3157555d3530639999a7b19ac7e8f976dbf48a45b4c315399a738eba51		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 11436 bytes

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