Malicious PDF — malware analysis report

Static analysis result for SHA-256 f050cdda042b287d…

MALICIOUS

PDF

78.9 KB Created: 2021-08-06 18:45:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14c9fa36cd07d34dace1a931a56c0e5b SHA-1: 21f4ad260f6cd6b9f1101b2bb40da199707624a8 SHA-256: f050cdda042b287d5494cbe179cbd4120498bcc333574878004d1e62d7cea15b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing or malware distribution lure, evidenced by a high number of embedded URLs pointing to compromised or disposable hosting. The presence of embedded JavaScript, detected by heuristic rules, suggests an attempt to execute malicious code or redirect the user. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 https://coretry.ru/uplcv?utm_term=titanium+network+surf+freely+educational+math
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/qt0av5pb4p1ldlmrbv1p3rq2t3/mefazutukuxaxufapezadasuf.pdf
    • http://alicekhenrylawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92867042468.pdf
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/a04e761c9dd1405b8649c593119d7470/tugitaxapuzu.pdf
    • http://neonatal-surgery.ru/userfiles/files/bozonito.pdf
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160844e483a6da---fipinixezepugawegog.pdf
    • http://majortaylorride.info/images/uploaded/file/kutogalonenapenoveked.pdf
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872787cca73---vafuvopeleraseligu.pdf
    • http://cokhihoangvinh.com/uploads/userfiles/file/gelirokoxeforolazuwizog.pdf
    • http://studiorinaldibedin.eu/userfiles/files/14517157374.pdf
    • http://sculecuacumulator.ro/app/webroot/files/userfiles/files/mawobinurajixunasemede.pdf
    • http://www.alexgis.com/siteuploads/editorimg/file/60471891527.pdf
    • http://afghansolar.com/userfiles/file/fojuluro.pdf
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a8560d054---pizofexelubu.pdf
    • https://www.fmworks.com.tr/wp-content/plugins/super-forms/uploads/php/files/riekcp5t4is0908k5fsrsu65cb/98282041794.pdf
    • http://hungbuloon.com/media/ftp/file/lutaj.pdf
    • http://elosc.com/upFile/file///ITX202107202248389756.pdf
    • http://lionsmarsala.it/userfiles/files/79929518544.pdf
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/1607216abbad21---99811260701.pdf
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078307925bb2---71328712298.pdf
    • https://angkoronetour.com/userfiles/file/18683851175.pdf
    • http://www.agrosystem.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160babe279b995---jevigedizow.pdf
    • https://hunde-katzen.at/soubory/dazekenugu.pdf
    • http://tano-cable.com/d/files/tafaxewexuvodawanagixelif.pdf
    • https://grupo.iberia.es/js/ckfinder/userfiles/files/nukapinudipeko.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_off0000cf23.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF23 16792 bytes
font_01_sfnt_off0000e735.bin
ad7027e8c2d173f33e73af2a1bbee2315773daf64d37d887f186394bbb46a7e6
pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 16780 bytes
font_02_sfnt_off000112f2.bin
e7af72de161b88d5f3337b73947761d29a56666d4cc54ac622460ad40d1a0314
pdf-font-stream PDF embedded font (sfnt) at offset 0x112F2 11096 bytes