Malicious PDF — malware analysis report

Static analysis result for SHA-256 1083541a2b726448…

MALICIOUS

PDF

70.3 KB Created: 2021-07-16 15:55:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2f0efe8677c65e38f778479ea71f6cee SHA-1: 7ef248c787b96e60d707ba20e2c62fbdd6a1c750 SHA-256: 1083541a2b726448b0eff4ab99059d82125cfda804bdff6dd0f66ce610b2d982
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics as containing a link farm hosted on compromised CMS uploads, indicating a phishing or redirection attempt. ClamAV detection and ML classification further support its malicious nature. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7775

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.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/1b696ba0b66b0c156ed523fcf210c8cf/92812224582.pdf In PDF document text
    • http://adamlegal.com/userfiles/file/46731911327.pdfIn PDF document text
    • https://idea-web.ro/app/webroot/files/userfiles/files/29909321985.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4bc83b68bd5f9780babb120e71b4f168/78806302342.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160abb6fcb88fd---sitarigaruvepif.pdfIn PDF document text
    • http://willbramephotography.com/11939933206.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609db0609b397---jurufu.pdfIn PDF document text
    • https://bajrahrs.com/userfiles/file/rafibexibu.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/2567992354.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607748b424319---tefodiwo.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608a30c37123f---bujifototewitovenubovip.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/gipapad.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/21b2e059b86238df23545cb268959b75/wedesema.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/fajukisanovawovovefo.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/96181799485.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/fizonemibavunefusuv.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c19a36eb10---molelidarirajolinebot.pdfIn PDF document text
    • http://sicilyontable.it/userfiles/files/60030821681.pdfIn PDF document text
    • http://abwrosedale.com/uploads/files/wubojizufosor.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adc45b86c8f---jofikawomezaxi.pdfIn PDF document text
    • https://vialivonica.eu/userfiles/files/29577440576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=asur+in+mx+playerPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01D 17296 bytes
SHA-256: fbb1bb53af571a61e5b86cfc8e16f05438c5be70b821cf5026eefd1d12fac806

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