Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cbf5e9707020c93…

MALICIOUS

PDF

77.6 KB Created: 2021-07-14 04:24:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f42642adb64625c3720e88f85f7cc42c SHA-1: 0093f541abea65642601358fc8329f20a43532fa SHA-256: 3cbf5e9707020c9353eac6b739913bb5a7a8b857f142c8fe178af617cae38e64
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a link farm pointing to numerous compromised WordPress upload directories and other disposable hosting sites. ClamAV identified this file as a phishing trojan, indicating its likely use in distributing malicious content or phishing lures. The embedded URLs suggest an attempt to redirect users to potentially harmful destinations.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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://thietbixanh.net/uploads/files/8002119180.pdf In PDF document text
    • http://casaatlantida.com/userfiles/file///bavimowuzawuxeraxofinez.pdfIn PDF document text
    • http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/49093ec8e689679487c18cf24b543d6c/10095956206.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dc32b85232---malamivenen.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/wojizadeviberodonot.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/35srua037pgdjj453f80iuct0o/41859252365.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2436cda95c---68330534848.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607230f13f6f5---mobofukifidelupupabopap.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/ca8551d86ccf3d16b3aa36b453426718/26243454041.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/47725747322.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/s3j753l0vdl27o74oqr0uqku25/baxelulexemarumar.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/pirokituwamonu.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd522b9de67---jexujokokanewenegisof.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/f4a33114e27329da4cb51f972841d6b4/xizunonalekot.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/7c5155e376fe1a5cdb90413b722c9a7a/75990542620.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/vagurumakisuwawone.pdfIn PDF document text
    • http://studiobaliva.eu/userfiles/files/54369536143.pdfIn PDF document text
    • https://geniodelweb.com/file/vuzewo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a626d6e43c8---gosamisisikibodokizogoj.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/a7061c2f28f16f768f6bb1249b54e661/nuvogitike.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/b3f7f214a807e8dfb469d2f1c477579b/88657457128.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098419ade4bb---memomiwusuzik.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/3gd9crr97odbhodmje8kep62ie/62902388559.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=accrual+based+financial+statementsPDF 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_off0000e578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE578 16908 bytes
SHA-256: 5d2fcfa5d83fb2882bcf7212e82f3c36557b7ef1096d5a98772db34e5816aabf
font_01_sfnt_off0001118c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1118C 10736 bytes
SHA-256: afe691f766756c893c50e60c052abf1203eedde2c762c662d5c1aed85a5233fb