Malicious PDF — malware analysis report

Static analysis result for SHA-256 20611673db9ace3b…

MALICIOUS

PDF

79.0 KB Created: 2021-08-08 03:07:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3aa4b7917f859d48612be31dc3b1e8d3 SHA-1: 28d365b0da9fb34a65a0f30faae16bee5ed5a594 SHA-256: 20611673db9ace3b460719d87837a140f03ec681cece9b62ce777c07d549c3f2
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS upload directories or disposable hosting, forming a link farm. This suggests the document is designed to lure users to malicious sites, likely for phishing or to download further malware. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4208

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=what+is+a+laparoscopic+colectomy PDF link annotation
    • http://pinzimoniofiumicino.eu/userfiles/files/jiwowivirafufenazasire.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3abdb9562---gewaxedil.pdfIn PDF document text
    • http://bendhorseride.com/userfiles/file/2634547556.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/0f183a813d1db95348dcb3ac88acf24e/5495341716.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607da8a07bb8f---mutegosowi.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/7002397024.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/jh05fpaq9mtp3n6unnrmpm8qso/lezunaze.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/b98df3fa538e59ad04a9e6a153e9bccd/kigabaxuvebo.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a651603d1cb---jalemadusudugalunoxir.pdfIn PDF document text
    • https://farmacieitaliane.com/documenti/file/zemabalale.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/be5ee7c979334c71bf31b86fd3199d6e/sikubufuwemuv.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/podibamu.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/6096fecfdd05501b7417005f16b213d3/34847817130.pdfIn PDF document text
    • https://vandolderskb.com/images/usr/vanit.pdfIn PDF document text
    • http://worldwidefilipinoalliance.com/uploadedFiles/files/6590890896.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608327915117a---vaminevasuvavopuvutidi.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075b53088f9a---navemake.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/jofikez.pdfIn PDF document text
    • https://fultoys.com/userfiles/gadaxegokabesudirovov.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/d0d76016de6ed4dbce26499ea54fbd36/wetifixafobew.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1626465596.pdfIn PDF document text
    • http://sbox-technology.com/upload/datoteke/37492741012.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ucms7vl1r54gu01f31kgg70l1/50699658715.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/29405437623.pdfIn PDF document text
    • 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_off0000f10b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10B 16976 bytes
SHA-256: 52a897a42a55c247389cc6222bd51e71c4b85f0f962aa991d9619aa8fc83088f
font_01_sfnt_off00011cc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC8 10644 bytes
SHA-256: 1b27b5f63db712d42ee849f6e40ee347146c0664336c5695db4e8c5357426abb