Malicious PDF — malware analysis report

Static analysis result for SHA-256 5e9142128f3f9570…

MALICIOUS

PDF

109.2 KB Created: 2021-09-15 21:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 3306e7c2b9a8ed10f70811ae6e22f938 SHA-1: 693797b760d3fb14f36189846411b8a0d0200db4 SHA-256: 5e9142128f3f95706ec288d5c8c6cf79cfad7a1671f49b5cb0e282389791e6fc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm strategy, with some pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://smidgel.ru/uplcv?utm_term=watch+the+wonder+years+full+episodes+free
    • https://secolink.sk/userfiles/file/15758491428.pdf
    • http://yasaitogo.com/uploads/files/sesonanebixix.pdf
    • https://mywayrtk.com/userfiles/file/fusekapav.pdf
    • https://kamhosting.nl/ckfinder/userfiles/files/93356490898.pdf
    • http://www.masozilina.sk/ckfinder/userfiles/files/45573363227.pdf
    • https://undergroundtakeout.com/userfiles/file/19142171975.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614050b6b3f64---loxela.pdf
    • http://karpatskiles.ru/store/file/69433828615.pdf
    • http://gonganmi.com/userfiles/file/mudarikorodofefexesuri.pdf
    • https://underworldgear.com/admin/images/fckImg/file/19257289068.pdf
    • https://arabadvertise.com/userfiles/files/63304327368.pdf
    • http://veterinariogiardinelli.it/userfiles/files/68867066894.pdf
    • https://sunsetlearningcenter.com/userfiles/file/44955939826.pdf
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613425df5c786---pavukur.pdf
    • http://sz-nuoyi.com/Upload/file/2021090306581965049.pdf
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137eb9f8628d---83129691178.pdf
    • https://unitytradecapital.com/ckfinder/userfiles/files/zabobotoxuvapag.pdf
    • https://12tiga.com/contents/files/vododanuwixixedabujo.pdf
    • http://lab4050.com/upload/editor/file/fikixalixabotizogizoti.pdf
    • http://focalthai.com/file_media/file_image/file/64074064226.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/161422a694d9de---18145716992.pdf
    • https://kubermatkaplay.com/ckfinder/userfiles/files/zumosofefiparawaj.pdf
    • http://biemmecommerciale.eu/userfiles/files/tetejadudasajuba.pdf
    • http://autobedrijvenindex.nl/images/uploads/27123510670.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001328c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1328C 16792 bytes
font_01_sfnt_off00014aa3.bin
7945dd6d15f828b6cd306d80fe219bae74b8b8baf0a62cf416d434e317783950		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14AA3 16244 bytes
font_02_sfnt_off000174c4.bin
27d710597d3cc8976e8d2a339adad2f2a17a0e3b3ede15be48f800200ac77e7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x174C4 18992 bytes

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