Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed75a034139fdc9…

MALICIOUS

PDF

70.3 KB Created: 2021-09-14 00:09:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 757721e73563d167d464a0f3c56a84b2 SHA-1: 93913986afd5fd7af870e942e5141b008b020b83 SHA-256: eed75a034139fdc9781984ac9596fc2dd1bf203064280f99408ce7332c66f58d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a link farm pointing to multiple external domains, many of which appear to be compromised or disposable hosting. These links likely serve as redirects to phishing sites or malware downloaders. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://agrostroi-proekt.ru/ckfinder/userfiles/files/68074822353.pdf In PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1612ff47e28b01---sapomawodekepijawijeve.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/7252447411.pdfIn PDF document text
    • http://daiichihr.com/uploads/news_file/kuvazigesapafosevovaf.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613396c85e8d8---56975544436.pdfIn PDF document text
    • http://bernendorf.ru/userfiles/file/59834651628.pdfIn PDF document text
    • http://ibsdhc.hpds.work/ecdemo/web/js/ckfinder/files/files/53805598045.pdfIn PDF document text
    • https://loonbedrijfschimmel.nl/userfiles/files/41200310779.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135bc51903af---nufisig.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/mugewedez.pdfIn PDF document text
    • http://studiorinaldibedin.eu/userfiles/files/82271415249.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/dozewozepep.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/75308573127.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/80821967760.pdfIn PDF document text
    • https://foodphotoshop.com/userfiles/files/11009965936.pdfIn PDF document text
    • http://citty.org/images/uploads/file/69725079195.pdfIn PDF document text
    • http://hooleihomes.com/cms_images/file/lovopafix.pdfIn PDF document text
    • http://marta-galan.com/files/varios/file/54730650609.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/34a8cd9a8d4630123abedc5b86f55acb/jejonozukisenopu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e16e894d4e---segepo.pdfIn PDF document text
    • http://mathcountsoutreach.org/userfiles/file/18037773805.pdfIn PDF document text
    • http://flightshop.jp/images/blog/file/bepoguja.pdfIn PDF document text
    • http://mylodge-naoshima.com/images/blog/file/rexozipofewabepijadalava.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/2407546576136bd1c84362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=which+is+the+best+navigation+app+for+androidPDF 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_off0000b524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB524 11052 bytes
SHA-256: c110fd7b2d0c93c31afecb6b15dba844564cd966f44b7f7b3010585f07d5d016
font_01_sfnt_off0000ce79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68B 14680 bytes
SHA-256: 21c1627770d0e1a4013b29609d57b17beeb2088f27944c2583c10c0d401d721f

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