Malicious PDF — malware analysis report

Static analysis result for SHA-256 d42e59953fd26b67…

MALICIOUS

PDF

98.5 KB Created: 2021-09-01 12:53:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0873586c631c9f3c92ebf70c83b4840b SHA-1: a7da0c7b87ac7ae3207123329b1b36a68e1ad3a9 SHA-256: d42e59953fd26b678ca508d9c824e47702d3f9b5b1966ff663273bf32cc66143
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and exhibits characteristics of a link farm, directing users to multiple external websites. Several heuristics indicate that the PDF contains numerous links, many hosted on compromised or disposable domains, suggesting an attempt to distribute phishing content or malware. The presence of embedded URLs further supports this malicious intent.

Machine Learning

  • Nyx PDF Classifier clean score 0.2108

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://crysiq.ru/uplcv?utm_term=ghost+in+the+wires+pdf+download PDF link annotation
    • https://novahealthclinic.ca/userfiles/file/42122851969.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/12624814321.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/07547aeba2446c8f3e1831a496d955ac/11152338064.pdfIn PDF document text
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/84979229328.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/c684e13327eebce4fbc41cd084c41e48/29602575546.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/kofob.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/sojupetev.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/48557230054.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096a946a1ed9---tevekexuwoto.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/ba954ee1336059cd42590f2c1a66b782/kagumexomofaxi.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/35519222187.pdfIn PDF document text
    • http://bivalyracing.hu/files/file/wovejusefulofobe.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/xujajidopolamosuk.pdfIn PDF document text
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/80290b428d1044b8e65b5ee19d36497d/risexivew.pdfIn PDF document text
    • http://metabolit.ru/files/file/40800213299.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2264f379e---vuwepazujijapurudoxexum.pdfIn PDF document text
    • http://kimhoatra.vn/upload/fckimagesfile/79978434580.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/sepugowokevimemodib.pdfIn PDF document text
    • https://www.surajinformatics.com/wp-content/plugins/super-forms/uploads/php/files/b1e9184650adbf4b30860d44c1e7ab59/18727024245.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/bojoxezagi.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/lajukaruxelulinodagufifo.pdfIn PDF document text
    • https://synersys.fr/contenu/file/87830949.pdfIn PDF document text
    • http://3handseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a964c77f042---judixinodidigikawupitil.pdfIn PDF document text
    • 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_off00013001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13001 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00014813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14813 19352 bytes
SHA-256: 99de271bb7339ad947951cbd7727738a38c38e41be0fcf54cc1760c637392bd6