Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec56ced810161b5e…

MALICIOUS

PDF

82.2 KB Created: 2021-06-19 18:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ea493d40247b7a4e90a742e432427a8d SHA-1: a7cc7bde3bc2c57e9351531cb52e96db47d6955d SHA-256: ec56ced810161b5e68fe5e3d2ff5264e2b4247c8501520b03d752cae62038c98
154 Risk Score

Malware Insights

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

The PDF file contains numerous links pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The heuristic 'ML_NYX_PDF_MALICIOUS' and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://allytemp.ru/uplcv?utm_term=decode+binary+to+text', are likely used to distribute further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8431

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://allytemp.ru/uplcv?utm_term=decode+binary+to+text
    • http://taiwanglassgroup.cn/userfiles/file/muweranetufimab.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9dee48b94---50839501204.pdf
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/acba67g1c1flshj3h7e4v8pv9o/paxifurafadesulavudi.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f226e63430---57088336987.pdf
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/lb6qe8fdfadt7l0uk4u9nm4dcl/levosovudekeditiresixume.pdf
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ecmagtgiol8fn6pku9d4366n87/bowuwenibozezomepere.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/67685409947.pdf
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160becbf869456---jiluraw.pdf
    • http://hotelgiottotorino.com/userfiles/files/10361120591.pdf
    • https://www.ideaklinikbakirkoy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084160ddba11---88106192211.pdf
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bab6fa14f2f---davuwolokabepiwetojuv.pdf
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/ce2e3b5a8c794679f86e015ab825d3c0/vaxineleneragejitusijagex.pdf
    • https://tajeer.co/userfiles/file/43356793193.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/lelewimu.pdf
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c02f476bbe0---rinebufile.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608019820f5af---kanixit.pdf
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/506cb03f590adb68dee2f946dd2d34f4/lofixame.pdf
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160719a57e2536---zapefi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec44.bin
9b843de2462d8aeaf23043e58862f4aa570a4744ad9cc55ccea9d884373578fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC44 5032 bytes
font_01_sfnt_off0000fd79.bin
b28dd5d5722aedcfeb37fe18c1d30b294f0476d9d1631092746a48403f61a9ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 2044 bytes
font_02_sfnt_off00010652.bin
2c79974ed0f55497b32ab3dc038dcd6d52cc0488e5975590c67e5c0893cb90d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10652 24964 bytes

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