Malicious PDF — malware analysis report

Static analysis result for SHA-256 54112ac6edf37958…

MALICIOUS

PDF

91.6 KB Created: 2021-08-07 09:32:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4a07b663e2d655c123fc01b6f976693b SHA-1: 4e0ef1dfe9590ecb2f64fa9823d8de50a7820356 SHA-256: 54112ac6edf379581ae5e7a7074a7b92b407ec8ddbb459a6acd89d9e1ad66af8
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3749

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://bomberosdenavarra.com/userfiles_nexo/files/29097871329.pdf In PDF document text
    • https://transport-vehicules.fr/userfiles/file/vageva.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d23e944e82---25880275660.pdfIn PDF document text
    • https://vntdc.com/upload/fck/file/45640056542.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4ffa73978b---ropawadut.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d4da9f7e1---94339574104.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/r91r36aojg0o9j5ggbedonu6b1/91259139721.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/55491912397.pdfIn PDF document text
    • http://fygl.net/uploads/file/160012361972.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160df6f8f68520---52078909135.pdfIn PDF document text
    • http://dolphinkorea.com/files/files/gajuxixo.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d623f26c4---zusamuxivibog.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/160af6b4d485c4---lijovexa.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e63258f379---nogedibuxozodarerofituzi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160943d2cc935a---voremasakemekobed.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607346f8d7662---8525218664.pdfIn PDF document text
    • https://appchecar.com/ckfinder/userfiles/files/90192449068.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/rajenojunas.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/nasexazorugekepekigekere.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b48ba4ca0f---28680404602.pdfIn PDF document text
    • http://toonesk.com/upload/47093782514.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/160947b0e8d9f1---sowoxopizusamu.pdfIn PDF document text
    • http://euro-ex.net/images/blog//file/13264309130.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/d116dd48c1a96b91e4e83703eba01b0b/siwarulugujorelitaletode.pdfIn PDF document text
    • http://benedictinoselrosal.org/ckfinder/userfiles/files/kogapuwukimerijupixawu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=romantic+restaurants+near+me+nowPDF 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_off00012f69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14780 10576 bytes
SHA-256: a9aac4032e1062a2805337005439fb7188644cdc4ee56f9e80b021d3f93012e6