Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53a059421d4e99b…

MALICIOUS

PDF

76.3 KB Created: 2021-06-01 21:13:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 356b6e38e4b4cc7fe7a2bb15ada04885 SHA-1: 1369e9bfaf17e70d78ebebee7088819f29e37416 SHA-256: e53a059421d4e99bdf066f5003f2c811a453bbe2a45ed1397416f5c7f000caa9
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, suggesting a link farm designed to distribute malware or phish users. The document body, though heavily obfuscated, contains references to 'test answers' and application metadata, likely serving as a lure to encourage users to click the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8080

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://cpbnatation.fr/fckeditor/userfiles/file/32090429469.pdf
    • https://tavio.ru/files/file/vazalolex.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094186f3f682---75472731513.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609491b1b8744---72097532932.pdf
    • http://locthanhwindow.com/img_duhoc/files/sowubumixafirisutitep.pdf
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/696fdda5ba69389d8fa903e7cd81c6a3/wafoveb.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160828c3de7601---2730452835.pdf
    • https://muratay.nl/userfiles/file/zojegimufavuwe.pdf
    • http://americanpetrochemicals.com/customers/CMS-IMAGES/file/92445109985.pdf
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077639adadb5---89190753981.pdf
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773803a16b2---gesofavajalusopu.pdf
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/41cb34252d5454608c9638fce66bf87d/30399924681.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adcfba700a8---39527470742.pdf
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/160923f4e8ae2b---34951106602.pdf
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160746630161ec---wezamewenevakifidif.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=integrated+math+2+chapter+8+test+answers
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea23.bin
081ca4a516d19ccf1df2668f1cb445a715e9a1c643d90fb9cc826bacfb12440c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 5812 bytes
font_01_sfnt_off0000fdd4.bin
405279d44852482836db2c8b6c3e7f73bee350f02414962e5a49b24577c86b04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDD4 12348 bytes

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