Malicious PDF — malware analysis report

Static analysis result for SHA-256 c151ff24d88fea85…

MALICIOUS

PDF

63.8 KB Created: 2021-05-24 08:22:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bb9a50b261559a3cee3c667a4e8123ad SHA-1: faedf52ee3ddee8746f947ae3e11b38d30883cb7 SHA-256: c151ff24d88fea851aa4c71047f36b3f802d9b5621eded473691e38506dc2971
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan payload. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. The presence of multiple PDF files hosted on these compromised sites indicates a distribution mechanism designed to lure users into downloading malware, potentially disguised as software updates.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9522

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://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a88cef9f708---95724642624.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d10f8cbdd6---26855145486.pdf
    • https://ltssinternational.com/res/wysiwyg/file/sapekutowifaxavisexiga.pdf
    • http://www.anclupnapoli.it/userfiles/file/78405987956.pdf
    • https://howardsteeves.com/wp-content/plugins/super-forms/uploads/php/files/0246fe27b82c055cef4f1e307a11a940/xaxesom.pdf
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076cfc0cab43---ropiwuzugukorigabojofele.pdf
    • https://tonitomov.com/picture/file/medodatuvodolebujipeza.pdf
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160809e60e92eb---wojujikoluxopivor.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a929c00780b---pofumijepiluzog.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a574ed52cba---23096808039.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16078811a26770---91925550436.pdf
    • http://monkey-do.net/userfiles/file/fodalilaranopef.pdf
    • http://hitecds.com/userfiles/file/jivodaridojuverin.pdf
    • https://hopefor.today/wp-content/plugins/super-forms/uploads/php/files/cd3de7a4fe04111172854d039b30a8bd/pugexen.pdf
    • https://taevlingar.se/images/pages/file/94299480831.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a00da9d4f30---jurixe.pdf
    • https://nscs.org/wp-content/plugins/super-forms/uploads/php/files/1471eaa923f97209064586f237887f6b/75897728735.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=macpwn+high+sierra+download
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d308.bin
ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD308 6744 bytes
font_01_sfnt_off0000e3f0.bin
585303edcd88df6bd1cbfeb8fb37912a7326e1e79b3acc9c74b5f3570487a26c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F0 5432 bytes

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