Malicious PDF — malware analysis report

Static analysis result for SHA-256 21389e71501bf0c1…

MALICIOUS

PDF

84.7 KB Created: 2021-07-08 12:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 59a196a520c0171abbf16face80d1a17 SHA-1: e0165c9790e1344ba3e2e1934768b07b9f71e694 SHA-256: 21389e71501bf0c101d58d7af09484ca49b7d0240879b36bab979e85cf26ccc3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, suggesting a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery, likely via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://cowichanseniors.ca/userfiles/file/66164690156.pdf In PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608dd24bd5dea---67918252053.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17d243407c---pemij.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/7e517aa25853c036a88b78ef6fe412f0/jiwomoso.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/kibuk.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1b43849ee8---93652223490.pdfIn PDF document text
    • https://ocvirapuato.com.mx/wp-content/plugins/super-forms/uploads/php/files/36770a6964223ae6225a8578af716339/83976554519.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/76517486450.pdfIn PDF document text
    • https://fullmagicweekend.com/ckfinder/userfiles/files/gezatinevalijapuma.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/d26e2d38822caec687862d4fee844b4a/36408351019.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3765f16a50---mofetavove.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/zufuwagawuz.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/8d9ae7pp5hmatnu7b5e3jddkh6/xezamotutuxidir.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210608_A5ABFC2F8C9B8EDE.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f884c19b70---64635501772.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160de5c417ec0a---tizenopufujodizunosene.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210622232107.pdfIn PDF document text
    • http://immodraft.de/images/architekten_agentur_images_/file/filebariradagitu.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/nafasud.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/14df9564a24ae565a4610e91f2da6221/vixujavesuzobefe.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210704_1D2121E5039880A6.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8d7112f9d0---jajavevu.pdfIn PDF document text
    • http://jarosi.hu/files/file/58847464586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=heat+stroke+symptoms+and+treatmentPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10234 10612 bytes
SHA-256: a4f9f1fb599b3a905791f4852c936c14817c89b7d11b55c683dfcd4477721ff0
font_02_sfnt_off00011a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A73 16636 bytes
SHA-256: 8dcc6c570926fa5506e2b94debcb2e6512d6c666bb35209b66d65228b98385a7

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