Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d38029d96e9761b…

MALICIOUS

PDF

74.0 KB Created: 2021-09-06 08:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: 603dc6710931544a3c7534274397c627 SHA-1: b7f757430d2307f2dda78149e1750859fed94251 SHA-256: 6d38029d96e9761b7703fd6bff05b84b0e10e40d23e5f49d66885ed638d3f2fb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b41a0de7e5---sitozewem.pdf In PDF document text
    • http://grani-tonkogo-mira.ru/wp-content/plugins/super-forms/uploads/php/files/6d18deed7edb4d282b369c3ae36fe248/80448045692.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609618ef80c63---nuforalamajapoj.pdfIn PDF document text
    • http://kaymccarthy.com/immagini/file/lodajomokavebo.pdfIn PDF document text
    • http://landia-print.com/pdir/file/27933907297.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/525a5e3a08a75542788ff04e7d915e5a/detojekugofewozal.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/uibd1qo23ro87gn66t1ibpnnaj/pigaveduw.pdfIn PDF document text
    • http://wisdomtours.net/upload/file/lopipefem.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/fefilukezedafifed.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609975f83379c---fojejufuzal.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ee9171be4c510f3cd3acaf718c6dff44/pivur.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160945c8168c89---latijarilev.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/20762820471.pdfIn PDF document text
    • https://sarenpinler.com/calisma2/files/uploads/luginuja.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/6c2c8e849b65583aad5285f61ed3798c/wokopamo.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/t1ek25evjk5d653misc0uulq86/kafumarazimidevo.pdfIn PDF document text
    • http://veterina-hrib.cz/user-uploads/files/mifiwajibirerowinewo.pdfIn PDF document text
    • http://ctmmaximoravenna.com/ckfinder/userfiles/files/mekizisekemimozenu.pdfIn PDF document text
    • http://umhouses.com/uploads/files/misanibofasexonewoj.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/4b9e813e9857b09130dea9b568e757eb/sokudinaxikafeme.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/6369217902.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/05d8ac9383fdf55b415db59f5a567614/50952372410.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210608_F76C439DE85E910A.pdfIn PDF document text
    • https://mygoaltv.com/ipp/images/uploads/files/54963226711.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=let+allowed+to+exercises+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_off0000bdb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDB4 16792 bytes
SHA-256: 645a4cf755f27ede76f714fededa7715a7b7205d6a4efa0d4b932cb539d9cf12
font_01_sfnt_off0000e945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE945 10652 bytes
SHA-256: e75692a17bb7c378336d0b64ff9c94b45e1f98699acd7bb432b1772f188a8e20
font_02_sfnt_off000101dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1