Malicious PDF — malware analysis report

Static analysis result for SHA-256 4723ff87cef0faa1…

MALICIOUS

PDF

66.9 KB Created: 2021-06-25 23:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 45af84da99d0c2f34fc8632f848d407d SHA-1: 86dc38ab0401359b7f00a4df488b343be1232119 SHA-256: 4723ff87cef0faa1b5558f868b01c1a28a2074f452ae8e4390abae4670e624ff
154 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories, suggesting it's used to host or distribute further malicious content. The embedded URLs, while some are marked benign, are part of a larger pattern of directing users to potentially unsafe sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6525

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 https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/f7d884d44dbd721eb681c0b298fcd632/10971040383.pdf In PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c29c8768b6c---17776380865.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/17334998355.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04dc8a554---57473787686.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/76231109944.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160927c99cddf6---kutojipetolenununega.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d86b204c---42173954250.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfa90b014f8---kulexegusoxi.pdfIn PDF document text
    • https://299-45.com/CKEdit/upload/files/19348886844.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f42409f44d---51604597755.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/49756598872.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091af6b9a36b---83511111766.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a9bde7e56a7---81987179113.pdfIn PDF document text
    • http://akinmedikal.com/uploads/file/zubukavudimapebad.pdfIn PDF document text
    • https://mannerfeltdesignteam.se/ckfinder/userfiles/files/pamukatowawejewajijulum.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/8648887846.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078f778756eb---rixiradase.pdfIn PDF document text
    • https://misionesmedellin2030.com/wp-content/plugins/super-forms/uploads/php/files/29tetifsp568c0d9e4pfvoj10o/fedatodetogaguni.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608b2d3277927---31347575624.pdfIn PDF document text
    • http://www.tomasjelinek.com/img/pub/file/bejeramesuxelabunevu.pdfIn PDF document text
    • https://mimpiindah1.com/contents//files/67691366016.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/lokusukusexud.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/76ritb214dcn7c3ianceldgqf5/bawokisudegalinuripajobot.pdfIn PDF document text
    • http://michianaorchidsociety.org/clients/2/28/2832e32407c795c8d28ffe68102aa18e/File/3402857214.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=pohick+golf+coursePDF 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_off0000c131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC131 17156 bytes
SHA-256: 505ab0adda23c68e36abab00b5eb40e2b7ea4c80df28b3c0c0451d0cd188d49e
font_01_sfnt_off0000ee7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1