Malicious PDF — malware analysis report

Static analysis result for SHA-256 858bd8162e3e169a…

MALICIOUS

PDF

77.6 KB Created: 2021-09-06 14:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: ec3d9acb387eaf921be4ba69497bc00f SHA-1: 5971b986f36a9104689e537098d23586017965a1 SHA-256: 858bd8162e3e169afcfd39012b38a42dcbc4f06fc72b9444230e72e9c08255a1
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this document. No scripts were extracted, but the primary attack pattern involves directing users to external, potentially harmful, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5190

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.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/m02579q7f7fhudlp0tpuojjhg1/nufobusosudowinineb.pdf In PDF document text
    • http://miele-service-center.ru/uploads/files/ruvidopatobibupejuxike.pdfIn PDF document text
    • http://aquinasnb68.com/clients/9/9b/9b9a52ed12f3b440fa02b6ce64642487/File/guwazo.pdfIn PDF document text
    • https://vaytieudungtragop.com.vn/wp-content/plugins/super-forms/uploads/php/files/3n9pvi5q4ncp7amgf484055bct/rujinatokotezaxunowitexi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9140c0e52---fasiwawuze.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/6c64162a2be5286957d5da497aa76181/bujafizolokovib.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/hgul8g7aub9i1un1gq8ktms332/pafewiwukibomerebife.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb83964710---87060891250.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/gu0ug47s3531td4v34ispkinp6/wumuxabumalulumem.pdfIn PDF document text
    • http://clingac.es/d/files/somufosodoxenu.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/parazotifapebijavu.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5ece41d34---dizozeruxilidepiluwodona.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/sitasobikowaserudo.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608fbe74c56c1---48991179681.pdfIn PDF document text
    • https://rajakeempat.com/contents//files/zotofivomujaxuxoxejut.pdfIn PDF document text
    • http://tuzvedo.hu/elemek/file/1445496886.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3d8fe3507b---nebupikolejidivozerix.pdfIn PDF document text
    • https://tour-paris-guide.com/cite_imgs/file/46339006982.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/c8dfe6554930368a32f1bed3462a3af3/30917109540.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/82d28918b2eaea0ffdd7d86dbd641444/kagemibitagunururego.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/a7c9f77a8a19898d129eda7eb2ea1fca/simikesitot.pdfIn PDF document text
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/u481nbtchecs6h2qjg9o5ksoio/bubasafimimozobuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=make+pdf+searchable+adobe+reader+dcPDF 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_off0000dcc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCC8 10648 bytes
SHA-256: 8386c71e728e0a257fdfcb49e5a8c4b71f2cb45ffa2d73aaf1f130d6b6356d69
font_01_sfnt_off0000f50c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50C 18304 bytes
SHA-256: 35b1ebe65d2922ea8e747ba6828a45465c53e2297d905429893b087573339569