Malicious PDF — malware analysis report

Static analysis result for SHA-256 1438eb9904fdcec1…

MALICIOUS

PDF

67.7 KB Created: 2021-08-28 11:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61393c49bd9184957cc58604c1fb0c3b SHA-1: 743dcfb03ce1b1984ae70b6bee2fe630da968c10 SHA-256: 1438eb9904fdcec18dd70d774c2e025ead2700f6586c673ec690d289e807c933
124 Risk Score

Malware Insights

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

The PDF file contains numerous links, many of which point to external websites, including those hosted on compromised WordPress installations. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a malicious intent, likely to lure users to phishing sites or potentially download further malware. The presence of link farms on disposable or compromised hosting further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4539

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://ooobelkom.ru/ckfinder/userfiles/files/15930400885.pdf In PDF document text
    • https://www.smartfutureexpo.com/ckfinder/userfiles/files/68813381156.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xiwipubovilaw.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/64913809766.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/28135042105.pdfIn PDF document text
    • https://www.swissfillon.com/wp-content/plugins/super-forms/uploads/php/files/e0d2288cd2b67e94d99987434a966586/fevitoxiju.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/dfb314f3d8b90ea4ac3ab0379209acc6/retiwafisuzo.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/72718107623.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611ddefc6222d---36373439941.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608170eec8717---44008286247.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16071183c4d95e---34690679871.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b653c4d1cb0---tidedetujuzodukaved.pdfIn PDF document text
    • https://songhong.info/userfiles/file/zovedufubofudemexefired.pdfIn PDF document text
    • https://ssmavidiyar.com/public/content-images/files/10356849852.pdfIn PDF document text
    • http://klinikoral.com/img/userfiles/files/43065988613.pdfIn PDF document text
    • http://xn--franzsischebulldoggen-lec.eu/userfiles/file/letebubagabuxab.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/ed3d2a87af7ad8f2fd694bfa2d806911/lodezoninitudedesiliwoxud.pdfIn PDF document text
    • http://fittbikese.hu/files/file/41407458668.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/tu59dr28hh5vmvsd1lsspgr9r8/28996941037.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1608460a90f1da---55470292808.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e5201c42bc---vifitigomoviw.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/dbr5gsib0hhidka0hpl7a2v89t/kiwitejiwuvimov.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160711a68d010f---52566087644.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16111d32d0586f---44162482799.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=can+i+bring+bananas+on+a+planePDF 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_off0000c945.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC945 15556 bytes
SHA-256: 13295c0fe3ef3381af396c36ea9c2157df8f955208bf86bcf3ef285d82243c4c
font_01_sfnt_off0000f098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF098 10500 bytes
SHA-256: 07a13393a3f7158b2b10845436d2d4148d7f535f6d0a5793742a63ad8c063617