Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7ef7ebaf2589a5…

MALICIOUS

PDF

74.9 KB Created: 2021-09-05 16:54:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ad1b4fd3e8d4c703d720bf63b6cc969d SHA-1: b43ecdfc6263e922388246548156770aa2e5b9ae SHA-256: 7f7ef7ebaf2589a5a3ca378fe9bd04640efac0cd567a93a40503bbc7d365ae60
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Heuristics indicate it's part of a link farm hosted on compromised WordPress sites, likely serving as a lure for phishing or malware distribution. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4683

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/aa37324bbc2572bfe85882a485d4abed/vewejutajeduko.pdf In PDF document text
    • https://jxloanchien.com/style/postimage/file/zesug.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16087d8d669752---nimixekiru.pdfIn PDF document text
    • http://autoscuolepintozzi.it/userfiles/files/nigiwejaxepizumogapomoge.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609867e5cab5c---nunovokaf.pdfIn PDF document text
    • http://vieclamtaichinh68.com/upload/files/liwexebo.pdfIn PDF document text
    • https://blugarden.eu/file/nemovutuzimevedakifu.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/69c49e72de2dda0f2c9acf7fb2fa5bfc/lujat.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/16095e52a21523---bariwu.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d5573c9403b923d0f0e5b1820bce582e/newobibulugemobenupolom.pdfIn PDF document text
    • http://studiopetrilli.it/userfiles/files/dotos.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/575ba9a49f28b29ef7ea37787b97218b/41960208432.pdfIn PDF document text
    • https://zabulgaria.org/userfiles/file/84216895687.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/abdmaapjhi6e5au7ho2n4ud425/felusi.pdfIn PDF document text
    • http://cnc-soustruzeni.cz/files/file/39917969371.pdfIn PDF document text
    • https://www.scilights.com/wp-content/plugins/super-forms/uploads/php/files/8c1b5bc60753fba47d664acf9beffbe5/59799312316.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/qn30rbqju44sr4qijdl6e9pmi4/pekerolaterez.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/550421b531689de312dc4a7def996a03/satodidetanavopipitoxe.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/sudokurewolewazuluzu.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/5gfb0ud9mra3r2ltjir2g60fct/56684744779.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/57302140401.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/safalumujamipuburunoguvew.pdfIn PDF document text
    • https://him-home.ru/wp-content/plugins/super-forms/uploads/php/files/8ef7f3ac4d7bca1fcd66059b620bc69c/18176927497.pdfIn PDF document text
    • http://gostium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adfc046e22a---56114761161.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=software+pdf+file+reader+free+downloadPDF 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_off0000d785.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD785 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF97 18332 bytes
SHA-256: d481b3b1915bd27d5d0a3eba59c661beb70f5bf6f30586f766c8e24b0822cbd8