Malicious PDF — malware analysis report

Static analysis result for SHA-256 10bb95e1adbd13ea…

MALICIOUS

PDF

112.4 KB Created: 2021-06-14 03:28:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19005552c5949788df551b9eea192221 SHA-1: 2411fb0a2fee75dd8142f048c038bf9080c518eb SHA-256: 10bb95e1adbd13ea3fd38c8ea2ed9e2e246e9c4c092fd081ee8b14dd4680a759
154 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It functions as a link farm, containing numerous embedded URLs that point to compromised websites, likely to lure users into downloading further malware or submitting sensitive information. The presence of multiple compromised CMS upload links reinforces the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7695

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://crewmak.ru/uplcv?utm_term=my+hero+academia+season+2+episode+20+english
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/54rkcd5ve27votnc464v0c11f6/kozufexopimonufowabipaj.pdf
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160725de3a9008---divufokudepozalap.pdf
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/a37662421723cd24371bf15aee8a9ead/pumisunuwoladof.pdf
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/a5f4cd6a185072393222edbb546f3782/wodubitosiwo.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/7aa7e2b8b35bb9063c1eadfbce322046/74241356385.pdf
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e398aa2e41---27382467878.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/79b0e0cafe925ebd83d58019631649a5/66226035625.pdf
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f2d5f23a5aadee4a1613ee1b6d4d691a/44115607503.pdf
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/4b885bd57c6fd8a28a955bd75d3cd45e/43594086999.pdf
    • http://mu-rrrc.com/userfiles/file/fimikeditevopobefuwoko.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fb128737a---84754395729.pdf
    • http://fallsplat.se/file/6900404486.pdf
    • https://equantumconsulting.com/files/files/wobise.pdf
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/7f8907200a6369299414e949c1bffbac/nidewurilebo.pdf
    • https://airflow-skateboards.com/upload/file/saxarodexele.pdf
    • https://mfdesign.hu/files/file/6938622758.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00011c76.bin
cac38fd3b0040eedddc806b4de82b3f04f19095381fa1291883a7fc20003c178		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11C76 37060 bytes
font_01_sfnt_off00018fb9.bin
dd2341840a5ba618df7678d38f1996997b509abc9a2fe7a31ded9405f4c78241		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18FB9 5868 bytes
font_02_sfnt_off0001a39d.bin
3c27cec6542549815ff322c8e6455861cd531d1745ff9e9f96f3cc7ac208a54a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1A39D 11540 bytes

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