Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d5537e8cf48cd8a…

MALICIOUS

PDF

69.3 KB Created: 2021-06-28 04:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 4028d9ee340c6de5579266d0da8eade6 SHA-1: fb19fbc1df184ce69b06b014d4167294b9bd42ca SHA-256: 1d5537e8cf48cd8aeeb864060893f66546615ba44cb540485e3bbc413b6077ad
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The presence of these links and the overall structure strongly suggest an attempt to lure users to external sites for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7666

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://chcial.ru/uplcv?utm_term=island+of+the+blue+dolphins+plot PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926dfba84fd---teluvujo.pdfIn PDF document text
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c247339e2c8---fabebetakesibugeleminize.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/morabonelapuzobuki.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/5cfc243cba9a6a0a20057c18dae5de20/toxeg.pdfIn PDF document text
    • http://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160760b38d27de---29649876466.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/f9c85594db05f1affe28e8ab0c28cc87/12657460035.pdfIn PDF document text
    • http://vandientuchinhhang.com/upload/files/newewisorafofu.pdfIn PDF document text
    • https://aimara-bg.com/userfiles/file/80658660263.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/036e55679bd278ca63b8bfe84d887766/kubesatokipubiba.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/97174831780.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/baxumusafisoto.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/pi963anudnrbl3j0pmc2fks39q/72186787231.pdfIn PDF document text
    • http://jrpst.pl/userfiles/file/senav.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/e76131dece1568f5c08ba1cfa359fb26/38334159052.pdfIn PDF document text
    • http://dienmaythanglong.org/uploads/files/47483992791.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/2f620224709387ba5a387478f3d76412/15086508426.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a832d86a49d---talixudenuzufifojepema.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2e7866f7a---sikopazuroxolazal.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160734ebe3d5a5---xugivefezetaxisewexevip.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/43822484415.pdfIn PDF document text
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608634de0cc65---95297459307.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B4 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd

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