Malicious PDF — malware analysis report

Static analysis result for SHA-256 9785b46bfdc5f16d…

MALICIOUS

PDF

64.3 KB Created: 2021-06-07 12:59:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5690e3019bcbb9bd0fc762b679c91fed SHA-1: f179cde70c5adab74ee3a709191939fe7f2ba8f9 SHA-256: 9785b46bfdc5f16d116da79be52319255914d3d35d4f69f8006423f997a5f0f9
154 Risk Score

Malware Insights

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

This PDF 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 hosted on compromised CMS platforms or disposable domains, suggesting a link farm or phishing lure. The document body, though heavily obfuscated, appears to be a deceptive lure related to a search query, designed to drive traffic to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8377

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://pistant.ru/uplcv?utm_term=why+is+there+a+flat+spot+on+my+head
    • https://amursvoidom.ru/media/files/71843841150.pdf
    • http://beateromer.com/bilder/file/96381802649.pdf
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/a2112b3da2432434989d55aa9c5755f9/dafunubipekup.pdf
    • http://boathousebrokerage.com/userfiles/file/87088158562.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/b70359a5ff5307a43f37a1d2623c952b/77717914244.pdf
    • http://ahkjt.com/upfile/file/28599341260.pdf
    • http://nsdadventist.org/FCKData/file/11353023080.pdf
    • http://analogsys.com/uploaded/file/604928247609b6f543f7c0.pdf
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160acbf39a277f---rurorisufux.pdf
    • http://bydnjl.com/userfiles/files/85081740674.pdf
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd00ebddef---52059243173.pdf
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0f043a607---danunoxom.pdf
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5d731e87b---kojivefaxuvulujepen.pdf
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f39d0eb8b7---mizukigidi.pdf
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/39ttduo3032nn31s1jkudb83j6/13521339661.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_off0000daaf.bin
9a6de5707539ec715aba6e8300b4e4c8c4874374b5dccb9a6696b26103db2d6c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAF 5396 bytes

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