Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a79512cbf8b097…

MALICIOUS

PDF

74.9 KB Created: 2021-05-01 19:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3735eb4197f8b57eb107b588469553b SHA-1: f6b51633d2be2258d7806eaaaf03abc834491f04 SHA-256: e0a79512cbf8b097cd220c96df9c91efedfd37d535d3cf55c9ee28398d92713e
156 Risk Score

Malware Insights

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

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to multiple compromised WordPress sites, suggesting a phishing or redirection attempt. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious document designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9281

Heuristics 6

  • 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
  • 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://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608831a2b3d13---zulavex.pdf
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca05c50c33---63733056425.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a0f511c71a---sudelabedetalegogob.pdf
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a1834d87ec---jexutexevirobu.pdf
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607351760a867---68180015051.pdf
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/f7cda5afee77f0b596406556d040474b/66913834327.pdf
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/1608677c253078---91096864093.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/ded13af101756065ce7533a843b526f8/36182006770.pdf
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6c88df442---55577665786.pdf
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16074c05ecc771---10069050849.pdf
    • https://www.gasserbush.com/wp-content/plugins/super-forms/uploads/php/files/5c3c01be11ea9f0f8d73629dadeb8451/lodadizolivefisejexula.pdf
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/486a202a4a07ff6fe82ad21b3c539064/85580933507.pdf
    • http://wbbray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e02083ec14---nabudawusa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=design+of+aerostatic+bearings+powell+pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3fb.bin
abae6e99a8f658d2207877ff4c1a48c61ee6073613681f3f55822e7bd975094f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 5340 bytes
font_01_sfnt_off0000f63c.bin
1cc2b0ab43307bbfdd8c71f902d131a2fe112f86a665f7c7f4069867f79f038d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF63C 10452 bytes
font_02_sfnt_off00011a07.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A07 4324 bytes

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