Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4ebb55e18bf3b8…

MALICIOUS

PDF

67.0 KB Created: 2021-05-24 01:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a933b3f113a44428c58a3e5c260df837 SHA-1: 2e00168fe7b39c29d96ed6e1446bc71e743b84ee SHA-256: 5c4ebb55e18bf3b893da4f5cf650d19bf0773b25e64f97992acb5a0c3b26adf3
154 Risk Score

Malware Insights

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

The PDF file contains numerous links to external resources hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading unwanted files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8220

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://iominneapolis.com/wp-content/plugins/super-forms/uploads/php/files/4fc4d844b89851c87cd6b4dbccde8281/vemamutasepapujesub.pdf
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/f980e74be23406360a4c1f27caee3ff4/28996242515.pdf
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/63ef920e786fb425c1f8a73441c8efaf/55727661045.pdf
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/1c9e8fd661dd21c90e8b1961dbf94834/97792164044.pdf
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/6702195130866fccb59dab35eafd151a/75259493821.pdf
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/284c4809c129f41289c2d2c8bd9f25b2/34810202181.pdf
    • https://abofahed.com/userfiles/file/99335741987.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/u6rdapd3qtqglla8pfge9pdim5/45654715243.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f83df25250---jiwavote.pdf
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/1f3ebf538037e0bbc8799c149dde78ea/86396291625.pdf
    • https://eyetracking.pl/userfiles/file/tidagaxifosifibirokaxolul.pdf
    • http://andreevmag.com/wp-content/plugins/super-forms/uploads/php/files/56053b0592af3b2e5c90ca637433818f/getikisijezi.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a6337ae30---zukej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=summertime+saga+new+version+2019+download+for+pc
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000db33.bin
510bfa6d1d4fdd7e8dbdf850fcaf53d22c3b276aee91b5a223f8bd2af8b5c9e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB33 6212 bytes

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