Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb7288034ca38ba3…

MALICIOUS

PDF

74.8 KB Created: 2021-09-02 14:28:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d5b6f41309d097a88b8819cf2314af1 SHA-1: 26828a9190e041bf15889c0c42552aaeec361a6a SHA-256: fb7288034ca38ba31a6906cac62c838a9af56073fa242dc282f10c246ec48a56
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as link farms. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent, likely to redirect users to phishing pages or download further malware. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.3852

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://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1610a8c91942f1---19662881206.pdf In PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607fa9a78239a---zasagolumaxupesesomijava.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/dadejavot.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c777fb2fd7c---raxikabofa.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/78f7032d43c1d103f0c9068390902dd1/zavixijuzokefowe.pdfIn PDF document text
    • http://sun-green.be/ckfinder/userfiles/files/wewofe.pdfIn PDF document text
    • http://architettogherardi.eu/userfiles/files/85259664332.pdfIn PDF document text
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a6cb8eb7da7---ketova.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/21921763390.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/95772549416.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/709267a77fe3ea64cfd1971eebfbffcb/92949639688.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b407e87688e---21462163628.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b795799c029---badisuvu.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/nekupimuparefeper.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/64841812171.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf9fab769d1---94998233015.pdfIn PDF document text
    • https://atpl.aero/ckfinder/userfiles/files/misoxirejivadedunif.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/3f1a913c4c30fdd62124b68a8c3b70dc/wanuzetawu.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7d3761ff04---tikuxepolizitijebuwuw.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160af8ff118d92---77465676108.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d9177b27ab---51852898066.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160896ea3343f5---6474978179.pdfIn PDF document text
    • http://sepremprod.fr/www/images/mediamanager/vanabovavosewa.pdfIn PDF document text
    • https://bringem.de/wp-content/plugins/super-forms/uploads/php/files/d12c8b31ffdb878beca48447adc4b8f2/sosok.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/lurovuloz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=karnataka+land+revenue+act+1966+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_off0000d91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD91A 10868 bytes
SHA-256: ad2e4d2faa60579efd7d8f77203fad407ac60731dd7019555cedaf2a3af11265
font_01_sfnt_off0000f255.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF255 17332 bytes
SHA-256: 183d87de1d0cbc27f22ff06378cf363d97cb16ce2ec873e93013c3d69ec26705

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