Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dac81f5b2db02d…

MALICIOUS

PDF

109.6 KB Created: 2021-06-19 09:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 584ac625ad7c272379a6dbf0695a33eb SHA-1: d7cd984797af5c46efd35ec6bc41d9850df86427 SHA-256: 63dac81f5b2db02de0538aefa5151be24360f6b0a7f491bf90ade0ea1a1bf4a9
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 a machine learning classifier. It contains a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host malicious content or redirect users. The document body is heavily obfuscated and contains metadata from wkhtmltopdf, indicating it was likely generated programmatically to serve as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8915

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://www.peopleoftheheath.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607944039b9af---vadirupudon.pdf In PDF document text
    • http://thedewakohchang.com/image/upload/File/2685685285.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/d9d8c7e0d5c1a13bc412a56eef0dbbc0/39140304623.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/6c239dc578c745ee841f54f586e89286/zipokifigi.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/a500f1b281a7dc35959e4f1aac428c26/tosibe.pdfIn PDF document text
    • https://sieompaysdebray.fr/lesiom/txt/imgadmin/file/nanakoguritorabi.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16085c9ff7814b---vurara.pdfIn PDF document text
    • https://comesa.com.pe/wp-content/plugins/super-forms/uploads/php/files/7anjt9d94bca89ge6o0s4vaor2/nilarevabovenit.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/0d6ddbb10a45d171e64320e90eeef72b/45782029019.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a26a4b56825---96251076916.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/89909163561.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/52bf4ff89e13e9c441262eaed53a9e8c/gofimejofukikideguguxeka.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/f90fd4c5ec376e65508c0b21608dc209/ziwagudubekapukowisajak.pdfIn PDF document text
    • https://www.aceitedeoliva.com/wp-content/plugins/super-forms/uploads/php/files/4e9c88e1204112af2c37035c031a0aab/84851781960.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830ecff0609---94886637520.pdfIn PDF document text
    • http://prmakeup.com/Image/files/lisemuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=meta+gs+build+mhwPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/dcda4a399c08c02b0381fa574ba53585/91387055734.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00016e34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16E34 13492 bytes
SHA-256: 0e4d75c1469cdb1efeceac0ee58342fe5e8c0d8ad0603615d678bc9e403a23b1
font_01_sfnt_off000198e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x198E5 5380 bytes
SHA-256: 64948f8c611c6856b00b36cba5db8ea829c25d2862a25ae0e66e2eabc4a9144c

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