Malicious PDF — malware analysis report

Static analysis result for SHA-256 11df93407eadb9fc…

MALICIOUS

PDF

82.1 KB Created: 2021-09-08 04:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 22115c773f7e76a02bc4af91d258b0ce SHA-1: 3e837b5559e1d8b5f0857e731e851f8184828d02 SHA-256: 11df93407eadb9fc20e8c25f3e24eab058099c239e662fbf7617629c463e7b35
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to a variety of websites, many of which appear to be part of a link farm designed to obscure the ultimate destination. Several URLs lead to compromised WordPress sites or disposable domains, indicating a likely attempt to distribute phishing content or malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • 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 https://pixomot.ru/uplcv?utm_term=pdf+auto+scroll+app PDF link annotation
    • http://thaoduocquyhiem.com/userfiles/image/file/50515766350.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/ghco73i9h1ga7a4e43bgsp6567/xemeninotumilezojunewu.pdfIn PDF document text
    • http://ttc-investco.com/img/files/88782081709.pdfIn PDF document text
    • http://bioscipublisher.com/files/upfiles/file/32963957207.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/7860b0afd0c3b471f63a2eb607607729/96832360377.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/51695891265.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/63f1db62ddde52088c11c8fa308d80a8/fikemik.pdfIn PDF document text
    • http://zonwering-belgie.com/ckfinder/userfiles/files/17378926471.pdfIn PDF document text
    • http://iccj.jp/images/uploads/fckeditor/file/76781531077.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aae22e2e526---68249921658.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8cb509d22---ximanerisolufanovixepafem.pdfIn PDF document text
    • https://walnutcreekguide.com/wysiwygfiles/file/zinupetadedaterinepuz.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/7ecfc9a5be814650ded705662d6e941a/93706557496.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/gewezojemu.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/56101868e5137b6bf8ebc06a92420f98/87720485926.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/58791592051.pdfIn PDF document text
    • http://mamnonhieutrung.edu.vn/ckfinder/userfiles/files/lipud.pdfIn PDF document text
    • http://vodova51-53.cz/files/43359751071.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092bfec3fbe7---bimebobaponizozodana.pdfIn PDF document text
    • http://sampoernastrategic.com/uploads/image/files/31195360526.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_off0000d8e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E9 19256 bytes
SHA-256: 0afe31361ad31be8cbbea871b35270305eb25b0ede962f7efe00425a1844a1dc
font_01_sfnt_off00010b47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B47 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001235e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235E 10388 bytes
SHA-256: dec7f21395c84482b9a68944148ea73017694a112a7ea9be0781546dc1ce1435