Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d0cae3a2bd34d0e…

MALICIOUS

PDF

69.0 KB Created: 2021-09-04 10:54:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6b249dc3d3cf10eba05e37c6e3c3a2d3 SHA-1: 2cda685c5e90ce9927b6d51736916e705a81511f SHA-256: 4d0cae3a2bd34d0ea68810c56b42a8264199617e21e58e392a036914511bbf08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to external domains, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://moyamoya.center/images/hand_uploaded/files/sowixefokokisevunorobon.pdf In PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210813210018.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080a94531014.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/15301364830.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5f2e19105---sabofomi.pdfIn PDF document text
    • http://sylvianapoles.com/clients/e/e6/e63d90d46a840f0b3195f531cec11f6e/File/bexuponolijuketakawewa.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/8f0b83a02cbb42c036892b3cdbf31010/sufakaduzutapo.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094b534e7061---zezanebisaxik.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/fidle72nuhakmoa4807i7vp3a1/80342259064.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328cb94e2d---pixaradiluzezikebat.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160a8fa075ff4a---rubamusivorizogera.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2fb3bac1f---gejuter.pdfIn PDF document text
    • https://terlickodds.cz/www/www/fckphotos/file/lebiboguvizefemekokiw.pdfIn PDF document text
    • https://ksboutlet.com/file/files/7073603337.pdfIn PDF document text
    • https://maxim-catering.de/wp-content/plugins/super-forms/uploads/php/files/6fov1j0c0ds0pngk85uvcs0avh/38264249038.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/tavogunolusipew.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/levusegutim.pdfIn PDF document text
    • http://ip-golubev.ru/ckfinder/userfiles/files/13796462712.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/8a038cc32ef07451cfdf2d3f1b105802/zerugem.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/267605fb5ab84827363d69b072df3a9d/89309620287.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/50739737790.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=probability+density+function+problems+and+solutions+pdfPDF 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_off0000b08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB08D 14160 bytes
SHA-256: 13c58b78c5ce31ece23ad89c45fc86c2a707d87fd863c76208b680ead346b021
font_01_sfnt_off0000d467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD467 11136 bytes
SHA-256: cef601e2c415ee23c1ec6608cad009af5b11ebe8bef065d56e3152eaf1ce0087
font_02_sfnt_off0000ee31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE31 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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