Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6f24816ec6b3f34…

MALICIOUS

PDF

90.1 KB Created: 2021-08-04 18:18:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ba0d5d62944a147bea400037462bbfe6 SHA-1: 5f0bffa13a090cfa71a43267796e0e26ccb8bc96 SHA-256: f6f24816ec6b3f34c766f5712b3724e81553744fd80686be50f0ec88fefee2be
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment. While no scripts were explicitly extracted, the nature of the URLs suggests an intent to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3961

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://irlanc.ru/uplcv?utm_term=free+hd+movies+2020+app
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/66dd2uercf660thbq83uhr5so7/35517945017.pdf
    • http://agcslohian.com/userfiles/file/41118699609.pdf
    • http://albino-pitti.com/pub_img/file/83167639977.pdf
    • https://ckmandarin.com/uploads/xavikaxibejomekaduxajurir.pdf
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/cbf044d52b1425ae87e704bc77a30a48/74754613169.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/30389a7322cecdb4ec85e73f8a6e9f65/66817382853.pdf
    • https://ivanamihic.com//files/76541325260.pdf
    • http://aldo-ins.com/userfiles/file/tukopem.pdf
    • https://gujaratisamajparis.org/upload/files/zinipu.pdf
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607be1ffa75fa---52577421637.pdf
    • http://pogotowienaukowe.com/Upload/file/63239134362.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/6ef56e01a02848dd966778313d07135c/kuzepolarogog.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e4457dd6f---29513146137.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/a4k9qr2g86fid71so7jup6odga/93630701812.pdf
    • http://iphonedown.com/ckfinder/userfiles/files/29585470030.pdf
    • http://bezpiecznamlodosc.org/files/file/47100197557.pdf
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb0e57ab8---34726985244.pdf
    • http://bibrka-school.org.ua/ckfinder/userfiles/files/81370030303.pdf
    • https://digireg.nu/upload/gosopemu.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/29d08485a257eca08d46ac06d4c1225b/mibasemotabolenozumalus.pdf
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/luzaxusozixopotadumarig.pdf
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16107086f0deaf---53669175258.pdf
    • http://www.toptehnik.si/images/sofidivesesarewaw.pdf
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/47c382fcf9b4c9ef2046afa5ae22547c/17195793210.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
font_00_sfnt_off00011def.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DEF 16792 bytes
font_01_sfnt_off00013601.bin
aa29f0ead0511241d27b1f7e70835c5c5dd9d1f3b4b3d3d3b88c109f5910b7aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13601 17932 bytes

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