Malicious PDF — malware analysis report

Static analysis result for SHA-256 9432b215191e37d1…

MALICIOUS

PDF

62.5 KB Created: 2021-09-02 08:48:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fa9b36173fd51406ed0095739ab14d86 SHA-1: bf5b36d3370831c377e6e3711d729fdc8d972afb SHA-256: 9432b215191e37d163b056d0e5023f79e9b22f0501740042ffe85800b38a1e08
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ClamAV as a phishing trojan and by an ML classifier. Heuristics indicate it functions as a link farm, with many embedded URLs pointing to various domains, some of which are hosted on compromised CMS uploads. The document body is heavily obfuscated, preventing a clear understanding of its direct user-facing content, but the presence of numerous external links strongly suggests a redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5428

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://klusjesindex.nl/images/uploads/44469819502.pdf In PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/51bf17fee687675f9e2eafa32430d675/wosojofozuvaj.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160f4c600e0d8e---wukutusipuwafate.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/a80c457b7e6d82f7795238ab100f18eb/56704818046.pdfIn PDF document text
    • https://pointswestliving.com/ckfinder/userfiles/files/54091144194.pdfIn PDF document text
    • https://riolospettacoli.it/filesUploads/file/farowitakafi.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/pobewivugokerifusurom.pdfIn PDF document text
    • http://buergerforum-tirol.at/file/93558292344.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4bdc425b79---wegup.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/76985362604.pdfIn PDF document text
    • https://malayalamfoundation.org/admin/my_files/file/23703485045.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/8qlqd1dilovtc0v8pnlsjaqgv2/wububipulivilidexude.pdfIn PDF document text
    • http://guss-ex.de/uploads/fck/file/74759035825.pdfIn PDF document text
    • https://marlin-aquarium.ru/ckfinder/userfiles/files/dosidipuninewi.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/47110107314.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/tirinola.pdfIn PDF document text
    • http://www.assignproject.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a9a00a2faf---21761507586.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ratewapawepufafegojupep.pdfIn PDF document text
    • http://okulsanmalatya.com/imgup/file/wolapomo.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609868698a6db---rabovojupevi.pdfIn PDF document text
    • https://printsolutions.ro/uploads/wysiwyg/files/6197780372.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/59302590400.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b849b6b7ab---16982245543.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=how+to+convert+function+to+vertex+formPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b796.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB796 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA8 15220 bytes
SHA-256: 910ec9c4ec51e6b82a71c3db3adde6eed9232d0c62e15838ee6a41b07668a741

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