Malicious PDF — malware analysis report

Static analysis result for SHA-256 aee6701fd1c38b99…

MALICIOUS

PDF

55.6 KB Created: 2021-06-19 18:16:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 835800163f6f8cc6444374a4450847c9 SHA-1: ba1067a98472f1e87dcc2a1bea051b17ca300bd5 SHA-256: aee6701fd1c38b99c575c64d39c15ff5e9105e7da13b41b677513b4316d798ce
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised WordPress upload directories, suggesting a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document, possibly leveraging embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9630

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://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1609d4fb6ced04---pusurojaregu.pdf In PDF document text
    • https://bursakaynak.net/userfiles/file/63939071638.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6dbcd5b97f---dujujasodesufugesufu.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093a2de9d3a0---986927980.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/79c7c5205bc1709a704a684ec66a8fc6/87248671916.pdfIn PDF document text
    • https://notofthisgalaxy.com/wp-content/plugins/super-forms/uploads/php/files/1uul1i7gfrsgoj47lh6i11cnio/93014132022.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/17157534cab69d97f59f60e7c52f0a1d/ronolewetap.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/24617be66df71d4b28fe5bb2ded60ee0/nadeforudetaxi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb8a653b8---dobozor.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d148f0c40---legirolenawezovagorogowod.pdfIn PDF document text
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/eef50ogqmh46324elnnghleqsp/33652415111.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/35867695276.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b5935fb65ea---tefofexipiritudo.pdfIn PDF document text
    • https://ascinfratech.com/clientprojects/trading/file/xutomagu.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/79418511776.pdfIn 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/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=american+housewife+torrentPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBC7 5172 bytes
SHA-256: 74e1893cb8544969146a113de5ecfd3ec7619f00afa31fb468f44f781f080af6

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