Malicious PDF — malware analysis report

Static analysis result for SHA-256 b66a73a1c85fe004…

MALICIOUS

PDF

70.2 KB Created: 2021-10-06 15:17:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: a2304e7c72e9172fabc223dd188598cc SHA-1: d09293b9fda11369114fb213aaecebd80df45469 SHA-256: b66a73a1c85fe0048847da23f8172adee63434ea2a41eab1b6935c5176439aed
124 Risk Score

Malware Insights

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

The file was detected as a Pdf.Phishing.Trojan by ClamAV. Static analysis revealed that the PDF contains a link farm pointing to multiple distinct hosts, many of which are identified as compromised CMS uploads or disposable hosting. The embedded URLs are designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3165

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 http://vinczeandlaszlo.com/upload/31787592491.pdf In PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae69b11924---jemojedapipake.pdfIn PDF document text
    • http://fotocaroli.it/userfiles/files/87273716834.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/6l3ka535hqq2vqdf46vsspd03b/7022006728.pdfIn PDF document text
    • http://standdominica.org/files/files/41460294259.pdfIn PDF document text
    • http://theclelandgroup.com/img/upload/file/wiroripefokux.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109270652046155.pdfIn PDF document text
    • https://houstoncoinshow.org/FCKeditor/file/53770283737.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/03872947fad77c2f2c06c35d27b6306f/49622513807.pdfIn PDF document text
    • http://juditphotography.com/picture/userfiles/file/69943260913.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/zinexesudubumivededib.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161495a415e435---91637856545.pdfIn PDF document text
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2b8ad5991---ditoderobamafale.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141632fbedcd---jetoxikan.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/xugobenasorapilofa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/3ab9c6f47f0028383628888451193ad6/vogogumixe.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1614e743601b16---nugepimivav.pdfIn PDF document text
    • https://vegan-eshop.cz/data/file/48800615417.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312733bc7e9---wapokomulodedoxe.pdfIn PDF document text
    • https://kingwaterpure.com/ckfinder/userfiles/files/xoguwinuw.pdfIn PDF document text
    • https://betsin.org/userfiles/files/selegurabozaremonudid.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/dosibipotetepadukozu.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/modosugafuforidedalewetid.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613249dadf4ef---45285116930.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/xaxefo.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1613cefac1cbf4---16872965338.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+does+a+computer+server+workPDF 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_off0000cd3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD3F 10768 bytes
SHA-256: fdbc00141ce6e877d4c2528cad135156c23936ddf58d7ac188f9946449aeab1d
font_01_sfnt_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 17868 bytes
SHA-256: 85fc84dbb6756421940f3620b330489e0d233aec9f0be482d4371b034e4d95eb