Malicious PDF — malware analysis report

Static analysis result for SHA-256 83a1c439aee64429…

MALICIOUS

PDF

77.8 KB Created: 2021-09-08 11:11:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c3c3b30fc1d6d8103f0ca3756d94126 SHA-1: 079b12668de8fa165a4050df78e5aa515c5398bc SHA-256: 83a1c439aee6442982ec29609d055a40b950a7913082713f76334cb091c32fc8
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to lead users to malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The primary attack pattern involves directing users to external resources, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7449

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://crysiq.ru/uplcv?utm_term=a+modest+proposal+pdf+questions PDF link annotation
    • https://n-v-v.dk/userfiles/file/zozixilinirin.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/96159938415.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/11362028927.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///gajiziboxuredojatirivoba.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/fa6861d25a42e9e62298f88844243615/35899086524.pdfIn PDF document text
    • http://fixafilm.se/userfiles/file/81018604306.pdfIn PDF document text
    • http://truthtube.com/UserFiles/file/72714073164.pdfIn PDF document text
    • http://bayernglobal.de/userVZ//file/5631424649.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20218202148381453.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/72206646586.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f56f2666---jigaxiremagasuxik.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/nvkhg06gonjhonl8uukmjh9as2/95707662396.pdfIn PDF document text
    • http://compufoxmail.com/userfiles/file/gubetewi.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/345004476.pdfIn PDF document text
    • https://maychieuvinh.vn/upload/files/68124096065.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021071804425773499.pdfIn PDF document text
    • http://dgjst.com/upfile/file/rozasufusulijufelivafipa.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/desekozu.pdfIn PDF document text
    • http://cl-pub.com/files/files/69378885762.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/33108623561.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021081509053473499.pdfIn PDF document text
    • http://dogoducthien.com/uploads/files/9973928089.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/godapoloxemujizuwutuj.pdfIn PDF document text
    • https://detector-billetes.com/Imagenes/file/3929172579.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d0894ea6---kuxofagoxukofubokabeduw.pdfIn PDF document text
    • 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_off00010732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10732 17276 bytes
SHA-256: 89fb0beb52f97678bc339b43d97194aebf9f74f029964a2c3e4b520dd950d2ff

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