Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5073e4489e199a4…

MALICIOUS

PDF

97.9 KB Created: 2021-09-07 12:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e82be2b9d7a8f2d5c61ec7c78357b78a SHA-1: c3b348a446f47397befe96cb1bea23d1963a8abc SHA-256: f5073e4489e199a405d2844714076862ffe6fe6d8a9766de401240fc3397db84
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. The PDF also contains numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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 http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f125eb055---7105231026.pdf In PDF document text
    • http://robalton.es/Albums/images/file///bodadazidugitun.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/f0c2210a2bccc5e28f6d4fae9adf2915/76461028252.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160852a5f93158---2691310332.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/mijuja.pdfIn PDF document text
    • https://maisonforville.be/documents/file/16464963513.pdfIn PDF document text
    • http://orem.mn/uploads/files/55307495201.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bae196d1bb---paludesefazu.pdfIn PDF document text
    • http://okwmd.com/upload/fckeditor/file/zunebosidofotaputopu.pdfIn PDF document text
    • http://www.guus.edu.mn/ckfinder/userfiles/files/piwim.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/59434595384.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/f3fe7bd55e7058ba780382f388a77b92/vevowubeber.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16082c656cd4e1---25298053164.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16073e34243b17---tolujazodoji.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/6g9ipv4ups4aj4p4mt63srqqji/maveloleparukixezudika.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/didagapuxiditejazi.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/72809331179.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8eae2191f0---sununepeg.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/sutiwimidan.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/9087103299.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16073d5256efad---46037113359.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160abdc0dc3783---15745906217.pdfIn PDF document text
    • https://rkdestate.com/userfiles/file/39608936746.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608865d621564---xazelifekip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=a+horse+and+two+goats+pdf+downloadPDF 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_off0001168a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1168A 19348 bytes
SHA-256: a51180f0bb48715bad96e86ed62c002f059f531913777757826558194b2c93c8
font_01_sfnt_off000148f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148F9 10752 bytes
SHA-256: b97c7024b529debd1d3f2b61fcb6d13cfab3575e69ebd214a9430689eee77141
font_02_sfnt_off00016195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16195 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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