Malicious PDF — malware analysis report

Static analysis result for SHA-256 66bb86cb42c9a1d8…

MALICIOUS

PDF

54.4 KB Created: 2021-05-22 06:18:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed57502a6fdc2f9aeb61782a2dfb3a5c SHA-1: e59acbed44b42824a94cdaf45656fc9265158e2f SHA-256: 66bb86cb42c9a1d8932208447de0c77954fe9e82181dfddaa4264d32ccce33e0
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to multiple compromised WordPress sites, likely intended to distribute malware. The document body, though heavily obfuscated, contains text related to downloading Minecraft, suggesting a lure for users seeking free game downloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9541

Heuristics 5

  • 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
  • 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://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870371c4cb7---lodazitonadigojubumas.pdf
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/a34b4ed9e74330fbc3d002002392fe66/lanizawiwij.pdf
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/1ef3437edb9c342c95ca25493f9de049/10641020127.pdf
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16088a7924a42b---xetalebefugabikaf.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609df19754507---36178430737.pdf
    • https://leo-translate.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf4684f63f---40488769544.pdf
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a82dc700d87---13004920338.pdf
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/1607ec4c201c19---55799984228.pdf
    • https://divinesacredshakti.com/wp-content/plugins/super-forms/uploads/php/files/ea5027e7cfe7e0e3dca6a651ac99db2a/ponoguvuzudire.pdf
    • https://www.justgym.co.za/wp-content/plugins/super-forms/uploads/php/files/bbcngb9cl3klultrmanlgs2ea4/50486933562.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/dg3tkj8cmodkj8rc927jc2p0vt/kanom.pdf
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/166db711068a52733368f4ab3abd2591/17750591615.pdf
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771ea273643---50340172391.pdf
    • https://asiarsolutions.com/userfiles/file/28965877782.pdf
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609152e95aea9---45310614564.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=cara+download+minecraft+pe+tanpa+bayar+di+play+store
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c2d7.bin
b35e9a3cf5b91becf214ffad2590f219a5feb5915781567691386791ecc44a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC2D7 5540 bytes

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