Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb5da8cc7b56605…

MALICIOUS

PDF

64.0 KB Created: 2021-05-29 18:43:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5fd62be7f968e094aaa2f71a84fe79eb SHA-1: bc57990412938077cea88d23648e524785d5355f SHA-256: bcb5da8cc7b566051d2a1b8285da6e743ed736b84f4b343cab80debf9db6e709
154 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate this file is likely part of a phishing campaign designed to deliver a secondary payload or steal credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8702

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://opuntia.eu/wp-content/plugins/super-forms/uploads/php/files/f1594e3a6ff09cdb4eb130a61bbe6a2c/nivipilobawuzijarifeki.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/ca13f95cac353edcd9a5c5c4ef95edf4/13947070208.pdf
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/b7vmgur89bd07ukp424ck7du1n/diwisaniripoxisaxipof.pdf
    • https://www.parkgest.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160708c04d8e4e---15726806980.pdf
    • http://ash-graphy.com/userfiles/file/ketid.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a15fdb105ac---40796113389.pdf
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/b54d9c378174a57f3fe26fbf805d7f26/56427215830.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6250e01f75---vovew.pdf
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/3bfc194cca6f3ff9ad29c707a03be3ca/mijiwaxufuguxot.pdf
    • https://mymango.ru/wp-content/plugins/super-forms/uploads/php/files/4545a7adb024c2ad1f64dce022a8c208/sipunavomoxawa.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/4oslumen69hvu7f41buu9islgg/28410734376.pdf
    • https://www.rekalibracija.com/wp-content/plugins/super-forms/uploads/php/files/857b1bf4d1871782d830762d4944d2c2/garax.pdf
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/1608f48d4c0911---27423789027.pdf
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/0d0239c33fbb8ada2f3d1e3c5e7a3963/58803979476.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/e9a98e45ce099035b39c4562642635ec/94117727845.pdf
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607859bc4ffe1---46593798716.pdf
    • http://dragonera.cn/admin/userfiles/file/wedifow.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=how+to+make+pica+candy
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5d7.bin
cda0d2a130305d8e84116d18f672d2867addd8a668325fd048539d06e13c36f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D7 5132 bytes

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