Malicious PDF — malware analysis report

Static analysis result for SHA-256 66b1a746fad2cd2b…

MALICIOUS

PDF

63.7 KB Created: 2021-09-24 03:37:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af892b1cc54b176769f0d7c7d3320e06 SHA-1: 78f3c161baec46e58aa9221109a2a3347fc2b84c SHA-256: 66b1a746fad2cd2bd4c6c5c88fa86c96892628c10d433e751f4528b32a834db5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1203 Exploitation for Client Execution T1566.001 Spearphishing Attachment

The PDF file exhibits characteristics of malicious activity, including a malformed stream and numerous links pointing to potentially compromised or disposable hosting sites. ClamAV detection and ML classification further support its malicious nature. The presence of these indicators suggests the PDF is designed to exploit vulnerabilities or lure users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7369

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://mantyobras.com/userfiles/file/85638021470.pdf In PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/de2c09246b3a5c31f054a72f05166941/soletuzererugepijig.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/zowadi.pdfIn PDF document text
    • http://ambvetsanprospero.eu/userfiles/files/73827069263.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/vudapibinilavakilamob.pdfIn PDF document text
    • http://f-kcc.jp/user_data/userfiles/files/nikazuzosasuxe.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/19490489763.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/tirofewejozilid.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/zizutevazerolezopedof.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/rakor.pdfIn PDF document text
    • http://cukorbetegshop.hu/files/52266186848.pdfIn PDF document text
    • https://globalathena.com/ckfinder/userfiles/files/20616132170.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/161367a13c847a---zerejetopazuvajinoveb.pdfIn PDF document text
    • https://akanaymatbaa.com/calisma2/files/uploads/bijanijetukanedoluwede.pdfIn PDF document text
    • http://www.pilartangguh.com/file/lamaku.pdfIn PDF document text
    • https://anakaygame.net/calisma2/files/uploads/54886413135.pdfIn PDF document text
    • http://kerrya.com/ckfinder/userfiles/files/musewafobobamegozo.pdfIn PDF document text
    • http://kaies.cn/upfiles/210901070255824772iw1n6s.pdfIn PDF document text
    • http://studiocommercialedelpiano.it/userfiles/files/39216753089.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/935792198.pdfIn PDF document text
    • https://webmedcentralplus.com/userfiles/file/94378903374.pdfIn PDF document text
    • http://xn--12cbg9dihj7egda2g6a7dceb1d2cp4nvgf4f.com/datas/files/89899060955.pdfIn PDF document text
    • http://imbirimbir.ru/files/24200567268.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161455ef60b96e---59517992296.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=live+stream+tv+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71B 10256 bytes
SHA-256: bc14610a02a5bc0f9a391835e7eae5b5a60a9a592c9ee6d63c7fc0a561412f8d

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