Malicious PDF — malware analysis report

Static analysis result for SHA-256 2187f366a19ef778…

MALICIOUS

PDF

61.3 KB Created: 2021-06-03 12:58:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a725af6fc95e76e6f6b39092479711ee SHA-1: 9bf17c0d0b687b37717399eea09b1ca9eac8de00 SHA-256: 2187f366a19ef7789ddcad95a1b6455f86dcfbc0e64d53f013dc986c17647d9d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as a link farm hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support its malicious nature. The embedded URLs, such as http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ee294c9f---barop.pdf, are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/48e75456e662b3bce1e1781d60f90a2e/46004428597.pdf
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087c6fcea3f8---gitotujenirijafujo.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b87ee294c9f---barop.pdf
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/16086ae0ca706a---52683318252.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/qrua8tuka2grk3oovpmch8n8j0/6898274820.pdf
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/9570d90136fa5499a51cb4080ee32968/3473477572.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b1a8447ddaa---45820395311.pdf
    • http://osc-pribor.ru/products_pictures/file/vuwinu.pdf
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160adcadad6085---wuwezipiwad.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094c3bf6d24d---lajerawumu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7ad21bdb6b---69169595926.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/308bea510b8df9ab328f965b00ba7d76/pewalesetufajipiwa.pdf
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087ecf353eab---92636752335.pdf
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/18e4aa32ecc68f79d73d108ff5d567af/jamasaxig.pdf
    • http://gyobel.itpublic/file/tegigopebikimupesejatad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=a+non-numeric+value+encountered+filename+phpexcel%252Fcell.php
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bc6b.bin
29419f5d653048a7832148ccbdc49fcd5da107e63181f3f2a7fd194031aaa547		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6B 5436 bytes
font_01_sfnt_off0000ced8.bin
7d0acb1254ec54e6f4bd861b912b83748cd47c6cee01e01d25429162252ab775		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCED8 10484 bytes

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