Malicious PDF — malware analysis report

Static analysis result for SHA-256 e63bd1ffce4d2a18…

MALICIOUS

PDF

61.5 KB Created: 2021-05-13 10:56:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c8afe10ecce1692d7af18160c4d9fb1f SHA-1: ca83554060099c0ff5e5cfc3f217eac7c17745bc SHA-256: e63bd1ffce4d2a188f954d4d74a96d37455c4e04b3f2d505c66496ebe670d7d5
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, indicating a phishing or trojan threat. It contains numerous links pointing to compromised WordPress sites, likely serving as a link farm to distribute malicious content. The document body, though heavily obfuscated, suggests a lure related to a registration form, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8151

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 https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9656d50e8---2071948047.pdf
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ef828eac78---39249044034.pdf
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/jb0ldegfkcsvoi2anfauodjm00/tavimek.pdf
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/8itihjf557ipl5kotls2irri76/4795565786.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/603e79b7e0390593076510efff04b575/vagaxudoduxexuvomezu.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/b2c1492a9ffb024c69a7c2b2baa27eb7/melisa.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160746bcd5bb45---vobunatanuxuraxaje.pdf
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1607b117f079e5---72695019881.pdf
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/baab1724068d31ef6d50868a527f7c4a/69427764857.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/1469aea79c5f76a5eb8c5c3a4e70d575/digufupade.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608bbe36a6d48---levujuganimumuvefaguzanof.pdf
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3b71f14b5---timim.pdf
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16081378644e1d---wiferemagatibulubatop.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d0b0c0ca258288bfea53faf84b9911f0/wojizelomagawenapefeloniw.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16072f95ff0799---44665281448.pdf
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/5te6ovdc197674sih381rrb3qp/58246127450.pdf
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce0ef9ef9b---33134427818.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=bitsat+2019+registration+form
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df4d.bin
47d87a9ba80fdfaf9d9672a49ab58441dd06f25824a54c6c384e7956a1020f61		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4D 5588 bytes

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