Malicious PDF — malware analysis report

Static analysis result for SHA-256 18d81ab748a8bab4…

MALICIOUS

PDF

90.9 KB Created: 2021-06-29 04:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 7caaa048eda74c0160a2d0a1b0794f7f SHA-1: e61204127ec5d6973353101c29b71c6e11b70001 SHA-256: 18d81ab748a8bab482164f8116fc8e3f05e71f43ca41b9f4bfae4cae8fded9f8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of links, many of which point to compromised WordPress sites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a link farm designed to evade detection and lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086855d54537---kaxodaz.pdf
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/rngf8vqe7ud5iaul142338g5ne/35094374813.pdf
    • http://suamayin.biz/userfiles/file/nabelowuvozixigupabaxutet.pdf
    • http://humanitool.ru/userfiles/file/69463630126.pdf
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baa20a87a6c---94000238538.pdf
    • https://batikatravels.com/userfiles/file/40821352764.pdf
    • https://b2cexpressdemo.com/userfiles/file/65515434679.pdf
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/lkbqg2tevcfuv55dos9usgd505/15480572467.pdf
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609db12d62253---pafowekokibujodovozeve.pdf
    • http://alphabodysupplements.com/newerac2c/userfiles/file/fekidexaromorevosejefome.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16095d71c68a92---natarazusijazetunew.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092cb108c7df---63952052557.pdf
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/raqg6guecqp58et8vnp1afs2mq/31459269800.pdf
    • http://sp3siemianowice.pl/userFiles/files/90035124060.pdf
    • http://superfishinglewood.com/uploads/files/wowonu.pdf
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/64d25098cca95c7449e0d5173498e0a0/51537839379.pdf
    • https://topjobsnepal.com/ckfinder/userfiles/files/32509525964.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c16750cd05f---xunetaxo.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862b55f3977---55266671799.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3771146d2c---79894926937.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608530eca11b6---malazuvumexun.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/d08f033c68d30e78ef92c8c2a906efa2/mukejelab.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/2106ee27ac583fcf496945d25e7a34a5/27524944544.pdf
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094182b64555---seked.pdf
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/80a592b3cc468db389d59506be31b303/pufovamibubami.pdf
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/29k5tpr7mp7jn47as9uke1ab3k/83673137014.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=book+my+learners+test
    • 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_off000102d2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x102D2 16792 bytes
font_01_sfnt_off00011ae9.bin
fb4213dcd60710fedcedf665da2d131e68f9220d2ff2f83fdfc687726bd5370e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE9 10436 bytes
font_02_sfnt_off000132a6.bin
dc5fb3fe00b454aa4d2f5beefe5ff1bcd8db88a01a66a2eb6d8e246d1822c717		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132A6 16872 bytes

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