Malicious PDF — malware analysis report

Static analysis result for SHA-256 f576dff04beacd00…

MALICIOUS

PDF

78.1 KB Created: 2021-09-07 09:20:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: aa8978f53fad743575e0bf4e430ee9f5 SHA-1: 4abb0ec7e448dd947144102c360780f88ae25ebc SHA-256: f576dff04beacd005f834ba2185807b9e104f33e930d26b775363017ea0fef6b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV with a 'Pdf.Phishing.Trojan' signature. Static analysis reveals it functions as a link farm, hosting numerous URLs on compromised WordPress sites. These links likely serve as a distribution mechanism for phishing or malware, leveraging the 'formcraft' plugin for file uploads. No scripts were extracted, but the PDF structure and URL patterns suggest an attempt to lure users to external malicious resources.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3293

Heuristics 5

  • 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.
  • 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://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d70cb6813a---bifima.pdf In PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a75c5d6cd9a---34850554946.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/48248779471.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160944de93d026---90907239717.pdfIn PDF document text
    • http://digifast.cz/userfiles/mitawemivagapuxewarujolig.pdfIn PDF document text
    • http://oaklandscreche.ie/userfiles/files/65044130496.pdfIn PDF document text
    • http://camionespanamericana.com/userfiles/file/zoxobujotogewaxexe.pdfIn PDF document text
    • http://mkngsp.ru/upload/files/xatemajiwiwid.pdfIn PDF document text
    • http://harringtonandlombardi.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zemur.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075c5b04a0f6---96490938462.pdfIn PDF document text
    • https://motionslam.com/wp-content/plugins/super-forms/uploads/php/files/4254184d2ab45c7ac92bc23ba8bfb7bb/buzizanakezare.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/0527f06962b3089ef3b19e3c48382a66/jovekukobufubuxut.pdfIn PDF document text
    • http://peoplefoster.com/pliki/meworamot.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16098d06130968---malezabaxik.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/51fc2d355795a234be3acf520277d337/panakaxubupufu.pdfIn PDF document text
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160d3df9779e95---bilitefexubuko.pdfIn PDF document text
    • https://activepymes.com/pub/file/70917750628.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210707_656481050FB3B47C.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c90b4731c3---48601963833.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/82134795432.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608af545136fd---tidanitu.pdfIn PDF document text
    • http://asiancfea.org/userfiles/file/75604233296.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/8566171462.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b75cb8686c5---tazugidiwugexivewugowoj.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/65903761719.pdfIn PDF document text
    • http://lovemyskindayspa.com/clients/d/d9/d99ed7cf7cbac978b7326c22a81d1608/File/tofajefabiwovol.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4dbc55514---wezonuro.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=return+on+total+assets+pdfPDF 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_off0000e7a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ffb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB5 18756 bytes
SHA-256: 897e419b0c9dc708cdd02c33accb1ba02d5d8f5ba0aba38676a064c8928d4fbb

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