Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd255781487a6d5e…

MALICIOUS

PDF

62.9 KB Created: 2021-09-01 23:17:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: df26e1fb9e32202e6db0105ca3a0d43b SHA-1: da34cbffba18de8b84d3c36ec1653996f3a9b35a SHA-256: bd255781487a6d5eb58363454e8480e61c54dd7332bf664fffd712d0453b1fdd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to multiple compromised websites, which is a common technique for distributing malicious content or conducting phishing attacks. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs suggest it's designed to exploit vulnerabilities or lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9364

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 http://tweddlefoto.com/files_contenidos/upload/files/51557148811.pdf In PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/zotozagovada.pdfIn PDF document text
    • https://inverpalmas.com/aym_image/files/166043775.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/4148a1c657bd538af2f0a079f9f5f546/15347685661.pdfIn PDF document text
    • http://mazdooradda.com/userfiles/file/74525943382.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608b0f35bd925---fisavivirupipufara.pdfIn PDF document text
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/donavutiropinuruwitonake.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/f65a0a24c6d09d3d4747b5be9981b948/duvopafamabexa.pdfIn PDF document text
    • http://w-mill.jp/images/file/76466740715.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/35a9cae1d8b6e76a203ef2d83048cf6c/34116415938.pdfIn PDF document text
    • https://xn----8sbcehyodmtf1czh.xn--p1ai/userfiles/file/89037183972.pdfIn PDF document text
    • http://canvangdientu.com/images/file/nojisezinunizar.pdfIn PDF document text
    • https://honda-otolongan.com/upload/files/95126378422.pdfIn PDF document text
    • https://ppuhperspektywa.pl/files/edytor/file/wafibusogovutitoreni.pdfIn PDF document text
    • https://greenturtleproductions.com.au/wp-content/plugins/super-forms/uploads/php/files/3ae9b9b1a8bc7ea16a2aaaf77c322684/8019155197.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/191445566431.pdfIn PDF document text
    • https://purebodycare.courses/wp-content/plugins/super-forms/uploads/php/files/9qeu84m88j00vthajkm0660943/8398618438.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/27553533982.pdfIn PDF document text
    • http://elateridae.com/images/FCKeditor/file/lokavetanefoxajowuxemuwuz.pdfIn PDF document text
    • http://xn--365-pn7mwb654m2qn.com/ckupload/files/kavumov.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/42700058612.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/63170778331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=knot+and+knotless+braidsPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE19 10464 bytes
SHA-256: 4d79065237e61f15c675ec6b955b9e3299a176e323c8c7ce2c475a0151cc61b9

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