Malicious PDF — malware analysis report

Static analysis result for SHA-256 616aa9e01fb7213f…

MALICIOUS

PDF

82.1 KB Created: 2021-07-08 06:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: bd71e0dbe7e6472d25ea9bb23ba04350 SHA-1: 965094aa965309c80eba02952e06cee7309f133b SHA-256: 616aa9e01fb7213ff04d43e2b929736c46352f28e349a11ad608a76bbcb5b47a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Heuristics indicate it functions as a link farm, directing users to multiple compromised WordPress upload locations and potentially disposable hosting sites. The embedded URLs suggest a phishing or malware distribution attempt, likely leveraging the document's content to trick users into clicking.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4803

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://lightspec.ca/wp-content/plugins/super-forms/uploads/php/files/da9b8c976f7d39417361ee6e208a9a31/kemisobupo.pdf In PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/hoo60fpe8nuj1t3rm994ilnbe3/divowemoluxe.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/ramegatutamajidigul.pdfIn PDF document text
    • http://streathamtaxi.com/survey/userfiles/files/gikowofanuvapixuwubosem.pdfIn PDF document text
    • http://amfmeg.org/wp-content/plugins/formcraft/file-upload/server/content/files/16073e117ceacd---jojuze.pdfIn PDF document text
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/pkfhj6pih30j3u1gv4id3vmbhl/fixadupavepexowalasejumol.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/3ef90d9267da8c1a2cf81bb6a75d8e17/solexedogeziputa.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608309874f2e2---18742476541.pdfIn PDF document text
    • https://dentalrud.com/userfiles/file/53411361660.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/niputovizelajeriwo.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/u4j94cmuj3qnrce51jr910vahl/xisuze.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/woruzimepok.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad9cd07843---guxuzojogebize.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f71d863581d39bca47918fc211a1a3fe/vutinegogazusivuzib.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/ef0e8808a25325cc28bf2d129590baec/dabebexerewefitive.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/8c2n6vc0f2u17vb3333l7moof2/pipusutanaveminav.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbbaf8431b---63227449453.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160973b20c4b40---fizesu.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/dereporelapidik.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/6e135d71df4a5bd3272477f1632074bd/78331522733.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/73183487319.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=example+of+a+petition+letterPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A8 10436 bytes
SHA-256: e72264859f937a7c3f7f2b992564f918ad1982969202b74ca19f3564e578e750
font_01_sfnt_off00011b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3B 17172 bytes
SHA-256: 277dd7e5399e9836fe45494cf25b2311c0e612fc88fc38f984d6a022529bfcbd

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