Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bc0eef5dd4f5958…

MALICIOUS

PDF

69.5 KB Created: 2021-05-30 08:33:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ff8b7e65af30c3dba0809f3ebd1fdd22 SHA-1: 3fa47f88f174681fb6a349860f74201946746887 SHA-256: 5bc0eef5dd4f59582fdbf6dc8a0cabec6ac19312b497d5d8d1d9d931fd068b1a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories, suggesting a link farm or phishing lure. The document body is heavily obfuscated, preventing a clear understanding of its specific content, but the presence of external links and the overall detection profile point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9658

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 http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081f8d965035---kadixonudiwovanafipuxoni.pdf
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/g40ahi1ea052do1cb3uv1697g8/57393238680.pdf
    • https://www.idahomedia.com/wp-content/plugins/super-forms/uploads/php/files/f776f1bab7183b037072d0b7bcfa6474/87918018231.pdf
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a70d017594a---45377067209.pdf
    • http://kistours.hu/userfiles/file/92540440994.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/bb0de5c4bd170e537f55060516652bec/vekisoda.pdf
    • http://cdmatik.com/uploads/file/sinomojipevesenazi.pdf
    • https://amblamy.ee/upload/file/76429938650.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/vm5rb75oalca7gi9hnf102m1i1/kanovumidobivalof.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/ab900792d4f8b4c6adb1745c10352f20/48871325074.pdf
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/ikrkqn3k5lj4nffif91s6pkn33/vitedururegubofetanomijar.pdf
    • https://nceptionsolutions.com/wp-content/plugins/super-forms/uploads/php/files/1d6971374e3f82fb2b17726ce8655d07/60271382940.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f980fd9610---26821941201.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/2f9def86a0f2b479dfe4c2dc5a01b32d/nikiwawajod.pdf
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/1d46d2f634d0f54f65df499cb5bd3e6e/duketosenaxebebirufe.pdf
    • http://www.ecvbrass.ch/user/web/file/41425139624.pdf
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160925682a4e5f---99870748608.pdf
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/a215508f2752401f6c5c30b0eede84e3/40297500816.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+write+a+project+charter+example
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e088.bin
6881bc15990035e12c5c8dbf079837f09f048563413f299826aa60504f2700c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE088 5192 bytes
font_01_sfnt_off0000f219.bin
e792e753874ce0f40c8cd235dc37d12582fee28062cf5cc98337f0d8a5bfc8bc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF219 9840 bytes

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