Malicious PDF — malware analysis report

Static analysis result for SHA-256 d75f3eff84d96295…

MALICIOUS

PDF

85.9 KB Created: 2021-09-06 08:57:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: d0e33d2dfdae4f68c20c8768ab58bae9 SHA-1: 67cf6b312b53b7fbf938237777cd2a42efefa8e5 SHA-256: d75f3eff84d96295b99ed3cf05f8f3fc0d7fe2b2943a8c173d990d333001b6b7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites, suggesting an attempt to obscure the final destination. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing lure or a downloader for further stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5764

Heuristics 6

  • 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.
  • 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 http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c009fd2b448---mefelejezavabomudijul.pdf In PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b0cbb498e6---vomamawovegew.pdfIn PDF document text
    • http://thepnguyentran.com/media/ftp/file/mifes.pdfIn PDF document text
    • https://nowackleverkusen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607b9c63ed3af---gofebakodin.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f146dd246f---68711359380.pdfIn PDF document text
    • http://progfin.pl/userfiles/file/tekosikusesikorudutaxo.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/xezijarezomobiwu.pdfIn PDF document text
    • http://ptairsupply.com/userfiles/file/77838353484.pdfIn PDF document text
    • http://boxethai38.comupload/file/78188946313.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/pejunike.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/da10a16be804c36904077c73a5b7f5df/bajixesodumalujugebo.pdfIn PDF document text
    • http://servis-hradec.cz/files/file/sisonuzuwidubizeveke.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160e880235b4ac---30402686805.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b838daee8e9---miwaxato.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/89541473661.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16096e0a65b39b---76847328661.pdfIn PDF document text
    • http://apluskleaning.com/admin/images/file/xisutasebulopur.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/32135952260.pdfIn PDF document text
    • http://dorp.pl/userfiles/files/43313348412.pdfIn PDF document text
    • https://aviatroglo.fr/IMG/file/63719734536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sis+act+and+regulations+pdfPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA7D 10972 bytes
SHA-256: 0ab610623c2a8a5cfd45a22bd995d3ff4951ea4de2293c57d4607a5b92e81911
font_01_sfnt_off000113d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D0 18408 bytes
SHA-256: 514f1fb328988666e7a6b9183ab4eb4b3c970ff92801c558deca05b68dc27891
font_02_sfnt_off00014335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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