Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b3d8c2ee3741a63…

MALICIOUS

PDF

217.5 KB Created: 2021-07-15 10:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: 119b8679ca674ba7d5691a56772dcdc8 SHA-1: cd94ca1e4de9037ca61dc7859e3f477cf5021835 SHA-256: 8b3d8c2ee3741a63b56b3bcb5bc89ac066b1260eaeb0aac4de45061a60fab0b2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://weifong.tw/fckimages/file/zididudozaduxeveva.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/71d98682693962223a00a4391e51b023/nopidixubam.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160e23ce235295---88570142124.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/76714615041.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609480e7ca90f---divabunit.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/kegewalunejunad.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160bc264056c98---56789439365.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e9696b8445ad9b5f330285432b7d86af/juferebekaguruv.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/5648689633.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16072515fe1a68---18671048644.pdfIn PDF document text
    • https://hoakhanh.vn/uploads/image/files/19504839097.pdfIn PDF document text
    • http://orchid-daikanyama.com/userfiles/file/talanobujel.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160961f135aafc---81672514358.pdfIn PDF document text
    • http://www.ipkameralari24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d80b3097899---71530885908.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/82047310731.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/kudagepetoba.pdfIn PDF document text
    • https://airflow-skateboards.com/userfiles/files/10182478611.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16071841e0c432---finun.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/fejulutilazepov.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/suvexinokowibugulofafojur.pdfIn PDF document text
    • https://kcharp.com/ckfinder/userfiles/files/5887067380.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=tommy+emmanuel+over+the+rainbowPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/b2bddef4a85a932e510d68ce99404947/29548607667.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0002f9ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F9BA 18024 bytes
SHA-256: a474cea76bfaf4d01d19dca1cb452c04e56109f3ad9744edca1b328c9af51f29
font_01_sfnt_off00032827.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32827 10676 bytes
SHA-256: 1a8f4fc4b6010f2d222b7ee11980f24a0476b9b9466842a22cd10408804ea77f
font_02_sfnt_off00034071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x34071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1