Malicious PDF — malware analysis report

Static analysis result for SHA-256 574c9cdf26033dca…

MALICIOUS

PDF

63.5 KB Created: 2021-05-13 17:51:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d88fb32987f1c5f6257f04efd194569c SHA-1: 42a423dc97fddf1e6d3d811aa8fd7e51cf19f78b SHA-256: 574c9cdf26033dcab80bc74478e2173b56294b9d53ab9bb053ff6299378ca53b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8681

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://infrive.ru/uplcv?utm_term=african+history+a+very+short+introduction+pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/1607402023671e---jurebafawesa.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16073c1c751781---99846647302.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/520cc64a7a47dc1c436fc173a84c61df/15712720910.pdf
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/6u1ms9ss1cpe4qigs62kumt1u8/wikirotujepanad.pdf
    • http://alnoorcity.com/userfiles/file/23590152197.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083bb7d3c631---79017346135.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3031cd312---56172857693.pdf
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160845a479e737---fuzoralimosa.pdf
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/e0b6afb6c9c92ab49144fe38f0450fc7/26028202646.pdf
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607610c84b91b---wazovexobikijajexiji.pdf
    • http://aimic.com/userfiles/file/liwasi.pdf
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/t7iu8l92s3002cqa54ojs4mom6/22678320718.pdf
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/75c857f66e7ae24f3404115d2c2e6c97/tipokesuturize.pdf
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/ipi5f0j4rnintnqle4ul8baeod/82304389510.pdf
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/61bc5cb9c134c5eb92a1e588fbf8f900/nukiseri.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d168.bin
4e6acabe0755070b8fc3b6423b95cea2061f1c63dcdc489ced82db6ec1cadda2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD168 5364 bytes

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