Malicious PDF — malware analysis report

Static analysis result for SHA-256 47d1590895c2e16b…

MALICIOUS

PDF

83.2 KB Created: 2021-09-22 12:19:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 4210804637daaf4d0a24ebf9eb174807 SHA-1: 43fa153980543882bf9d75c0871aa9232cb87e20 SHA-256: 47d1590895c2e16b0759433c5b73bc5271310ac3af62d35242152ddc3df81a96
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs that point to various domains, many of which are identified as part of a link farm on disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of non-clustered links on disposable hosting, suggesting an attempt to distribute malicious content or phish users. The presence of compromised CMS upload links further supports this. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6964

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://khachsansapa.vn/webroot/img/files/texexej.pdf In PDF document text
    • http://dsacare.com/admin/uploads/file/79116765798.pdfIn PDF document text
    • https://interativacorretora.com/fotosempresa/files/wifubefokejoloj.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/58681583538.pdfIn PDF document text
    • http://handlpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pusomifupujemesukepitisa.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/rawufuwaruduxiximeka.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/152443951.pdfIn PDF document text
    • https://actorconseil.com/files/file/pikodejedesanunebikidukom.pdfIn PDF document text
    • http://nayyaralidada.com/alpha/ckfinder/userfiles/files/worepukajofarifadosax.pdfIn PDF document text
    • http://randoquad72.fr/userfiles/file/gifiwop.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/89340482669.pdfIn PDF document text
    • http://diamantina-joaillerie.com/ckfinder/userfiles/files/73273471743.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/36028038182.pdfIn PDF document text
    • http://massiimo.com/piceditor/file/82078648738.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e87d636f6---dazogajilemogezaxiwazuxi.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/42246795296.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/lorijovokegizogumujevu.pdfIn PDF document text
    • https://adesso-moosburg.de/images/file/45473803476.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/f5cbc674f9a4976aabeaafc332738197/nomomotolozijuwojosune.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/bekurolebuxojowepuruti.pdfIn PDF document text
    • http://wohingltd.com/userfiles/nagizivoru.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd4d1afb5c---44061088274.pdfIn PDF document text
    • http://graczeonline.pl/userfiles/file/26227649287.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/diruwebapa.pdfIn PDF document text
    • http://metzlerranch.com/userimages/81609299800.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=redmi+note+8+keyboard+downloadPDF link annotation
    • 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_off0000ebb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBB1 10928 bytes
SHA-256: ce3643c6eb21e56db5161d9953e3e26ce66ae124e5ae3ef2cfebefff4d8d5416
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 19188 bytes
SHA-256: c986da5e43b32608821afe3349c9261ded541e057c77cf46cf57900fce1b2c4c