Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cdb88285cfacec9…

MALICIOUS

PDF

44.3 KB Created: 2021-09-20 21:01:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e097261eddd79ef9152903af120eaaf SHA-1: 5cb9fab94f6f9146986f168c08df1d5444871782 SHA-256: 8cdb88285cfacec9b8bab4d6b9dc13d69ccf90cc7f5dcc9d2cd8d7f7ec07de6c
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are consistent with a malicious PDF dropper.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7355

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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/79cc4f24a10fedc240b5e467af951a2b/lewivemuzoxexu.pdf In PDF document text
    • http://snieznik.pl/userfiles/file/68569275024.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/tonujabu.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/gulexusipizomugero.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/gimuga.pdfIn PDF document text
    • https://ginniglobal.com/uploads/file/furodawasogenet.pdfIn PDF document text
    • http://www.weilandensemble.nl/ckfinder/userfiles/files/38599405411.pdfIn PDF document text
    • http://herium.net/FileData/ckfinder/files/20210913_8E0FE63030A03D34.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/buzekat.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16131051a13ab7---pavasofuminodubejaxuxu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c594f655ec---jelakexugovon.pdfIn PDF document text
    • http://powerfalcon.net/uppic/files/fegobabebogux.pdfIn PDF document text
    • http://7sate.com/filespath/files/20210917175838.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/28676407222.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2209ee5fbdd54cc1d51bcf50fda5b973/26177899903.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/25408071995.pdfIn PDF document text
    • https://fier-forjat-valimet.ro/ckfinder/userfiles/files/bebuvonuda.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/12907212930.pdfIn PDF document text
    • http://sbcnepal.com/images/file/lajirax.pdfIn PDF document text
    • http://audyt.rowerowaszkola.pl/imgturysta/files/sobexekajut.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/f5d3f9f95b88b3d0ac6b35853572eb5b/runosaxadotadowoku.pdfIn PDF document text
    • http://stlukesfp.org/ckfinder/userfiles/files/42327824037.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/83404663298.pdfIn PDF document text
    • http://solmoda.it/userfiles/files/gezuxitudazexifojofes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=microeconomics+and+behavior+9th+edition+pdfPDF link annotation

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