Malicious PDF — malware analysis report

Static analysis result for SHA-256 321a0948c6bcf1d2…

MALICIOUS

PDF

62.6 KB Created: 2021-05-01 00:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 61fd8cfc7bd9cf5d1b93a1eab3c1e8ff SHA-1: 6859276bf93471b4303a032a15f6a82c05aefe54 SHA-256: 321a0948c6bcf1d254b3808e050db6626a7de22c71589c090d7a9a377303bfff
194 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to compromised WordPress sites, likely serving as a link farm to distribute malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of external URIs and PDF link heuristics confirms the attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8133

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/e15e9790845b3d56d4a2c169224074ff/52727752155.pdf
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083323fb6505---81356911946.pdf
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9b50e3146---31651800203.pdf
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83b413e3e---63923092819.pdf
    • http://www.orhancoskun.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f1882446fe---86929779798.pdf
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607018fb390f3---76849584184.pdf
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607031b851428---39015553667.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/8a87bfb49d0802ade87d375333e57e6e/33855308905.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6mhn9n22ei720lscuhrcb78s12/80040234668.pdf
    • https://www.18fire.com/wp-content/plugins/super-forms/uploads/php/files/55d64f29bb968c2acb974ab88a861926/62636566388.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/e881725c5826e71e2b5e7aa169943f43/52599982708.pdf
    • http://doublehappyvstheinfinitesadness.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3bf0b19bc---dozafobagubeve.pdf
    • http://bagandpack.ru/wp-content/plugins/super-forms/uploads/php/files/abbba7dafe5d599a23b3175cdca15a4f/vemogafirudisevivolop.pdf
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160808d2fc03fd---wagutotukilu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=employee+suggestion+box+template
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2c.bin
54db93f7b44b8725e61742ae208633fdebbcc3dd1affad9133f4e2ce2e75f778		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 5308 bytes

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