Malicious PDF — malware analysis report

Static analysis result for SHA-256 2132a88b9432cafe…

MALICIOUS

PDF

77.0 KB Created: 2021-06-11 12:54:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: cb6b23db7832df89ba143fa222c583cf SHA-1: 54d6335025f5bf393fd572ab2af0e83d40d7b0ef SHA-256: 2132a88b9432cafeb9d7433db338eb1d32a85d3b05097b27cf3d9a3b4feb58aa
96 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm or SEO manipulation scheme. The ML classifier also flagged this PDF as malicious. While no scripts were extracted, the presence of external links and the nature of the heuristics indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9220

Heuristics 5

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://huntic.ru/uplcv?utm_term=god+of+war+ghost+of+sparta+psp+save+data PDF link annotation
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/4cac21887ec0d7d386e2bc42dc0e06ba/62893479980.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/61f50fc6050d6784dbeba35c8d91cd0b/jarigifatuziluripedan.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/7efdbe081bd5aa1f3c62c298084f65d4/40853704382.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/4667bca75b9f8191019f5f2d04f08393/sapor.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607d2b98d4e78---78739304113.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/9fc8d5221930a2dfa26e05f0fc4d945e/donimiwuxul.pdfIn PDF document text
    • http://handbook.hu/upload/page/file/juweraxumajafokojejoj.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f65cc148f8---pexodajilonisolizax.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2c3024a36---26550738003.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/iqcq3eoud71gd151bs6oqeigk4/kebov.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9f7f7180b---nafufizalug.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/482230a394757c503835aed2db3e4815/peraxuf.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/548761e790bea7c7e9abff4f0642677e/fijukodu.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-5-4/20210504171906676653.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d21ec1dfc---36307505124.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b3cefa390f---wemizibi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 5456 bytes
SHA-256: 305ffc7911bcb162dc49a0ab1f8b0c68d3c0201c58da434b0b2a56372c24257d
font_01_sfnt_off0000fa52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA52 1800 bytes
SHA-256: 51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
font_02_sfnt_off000102e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E0 20656 bytes
SHA-256: d34b4a38d9834790d206fbe254da6c3cfec7f96daa584b3a3d1748d159331f29

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