Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e47c18a1c0c9d5…

MALICIOUS

PDF

60.6 KB Created: 2021-09-26 21:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c958db0e9047c0817a5fd3129517304c SHA-1: fad9bf5ed5e5828c49d7c44c79353f7fa6f4f1ec SHA-256: 99e47c18a1c0c9d5339b15a9b204c1a437f0237e5e404db6960bedb594a57a95
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for executing malicious code. The file also exhibits characteristics of a link farm, with numerous external URIs pointing to various domains, some of which appear to be compromised WordPress upload directories. The presence of embedded JavaScript and the redirection to potentially malicious URLs strongly suggest an intent to deliver a secondary payload or conduct phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6961

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=lumber+tycoon+2+mod+menu
    • http://shangrilayunnan.com/ckfinder/userfiles/files/20619204295.pdf
    • http://manuale.aziendasulweb.it/userfiles/files/nuvewozuro.pdf
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/23e091d2f8cff3334d1315d36949f648/sogetesedalasobavedozomu.pdf
    • https://dpdpunjabi.myskoolapp.com/FCKeditor/FCKimgUpload/file/47424650543.pdf
    • http://maezawa-jidousha.com/js/upload/files/71690290186.pdf
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/46142187731.pdf
    • http://glttek.com/userfiles/file/61028188354.pdf
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d79bd14025---zukadiwawunamuwuxojofuf.pdf
    • https://greenlandpark.com/uploads/files/87556724641.pdf
    • https://upaspor.com/resimler/files/kolikiwasepikiraxib.pdf
    • http://regionalhealthprogramsww.com/images/file/zogokotalulebabebas.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e845b10027---65400617916.pdf
    • http://www.yemany.com/yemfiles/files/97049608178.pdf
    • http://www.ih-consultant.com/ckfinder/userfiles/files/56890370018.pdf
    • http://fmi.lu/userfiles/files/52785399320.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/7a6fbb4fd7b2bd630c14edeed0e3d00d/14669573722.pdf
    • http://gpmpoolandspa.com/ckfinder/userfiles/files/33626277891.pdf
    • https://wmu24.ru/media/file/zoxoxafometuluwatemufu.pdf
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/9008d2d0cb49d4bc6fad24d64fb1f049/lopup.pdf
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000c901.bin
34802e89bcb3048e26558336ab0f828568513769f69d716087261867cd6a339f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC901 10492 bytes
font_00_sfnt_off0000b0ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB0EA 16792 bytes

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