Malicious PDF — malware analysis report

Static analysis result for SHA-256 c000a8d68e94f308…

MALICIOUS

PDF

74.3 KB Created: 2021-05-29 15:30:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1e1243bc37202df0fdc892929d294f8c SHA-1: 3b5aec7be00359059375a62cd7756bbb0e1243a7 SHA-256: c000a8d68e94f308065603426d57262e52e491ca2d225779e5da44d6ea0938e5
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the document is designed to redirect users to malicious content, likely for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9791

Heuristics 6

  • 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/bd377decae6796e7e2b98bb441bdf052/jajoroze.pdf
    • https://mrmobilewebsite.agency/wp-content/plugins/super-forms/uploads/php/files/94f0f73dbc20343d68b683e167054148/vubetedawagaxugunojut.pdf
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160a42fde67a3b---40579988086.pdf
    • http://pansophers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085a55d37d47---91555965722.pdf
    • http://bajajsports.com/userfiles/file/tulut.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4eb4ca821---xudiroxivonosigojetajovul.pdf
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/1ec2050e65565b3f2572bb3eac0e0f95/25007916892.pdf
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/160ae5ee332fac---83668658459.pdf
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/dae9f2f08aebad8eca9a1d1fb8391ca6/femiweluwujepatobepod.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f85c9dab61---33800229024.pdf
    • https://alignerco.com/wp-content/plugins/super-forms/uploads/php/files/44db52661b55b20de81561efe022fb0c/96910096736.pdf
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/56483f91a67608d1bf2d04f6ad20a6ae/fovemepodutido.pdf
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/160949dfed4f84---davavodazopese.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/41ac28d14cf3050c7f6aef2059f549a0/japafakizevapirekaxuni.pdf
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/670bj40rrfh63bgc1sk23drg9u/21965250041.pdf
    • https://alnahamgroup.com/userfiles/file/bepowixedudumu.pdf
    • http://tomaszfilipczak.pl/userfiles/file/79250219676.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=apple+iphone+8+caller+can%2527t+hear+me
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eebe.bin
d3027ac44d91ce229e37c501db93e232b7eec1bfbb6562fb34b07a825b1de650		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEBE 5212 bytes
font_01_sfnt_off0001005a.bin
7d92f509686adfc772cf1a7e3c4b80ae6bfa8263104c07db09e88aea7d5516e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1005A 11456 bytes

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