Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c50fd0daaa2584d…

MALICIOUS

PDF

85.9 KB Created: 2021-09-03 03:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d73b56a2ae54c9c6b40b2eabf5172b57 SHA-1: 04e1f5136ab51492303af671e0160a3d190a5d91 SHA-256: 9c50fd0daaa2584de98da685bb9182e6be1aac9a0c93cc57936c85a91694ba07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for exploiting vulnerabilities or redirecting users. Multiple heuristics indicate the PDF links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to host malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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
  • 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://hyunshin.net/userfiles/file/42232791503.pdf In PDF document text
    • https://ltssinternational.com/res/wysiwyg/file/somon.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021081203300466.pdfIn PDF document text
    • https://tainandentist.com/uploads//files/202108120412377919.pdfIn PDF document text
    • http://wjcopy.com/upload/files/dimelepubupisimal.pdfIn PDF document text
    • http://viquadro.com/userfiles/files/96715523053.pdfIn PDF document text
    • https://nacionalequipamentos.com/ckeditor/uploads/files/73168070122.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/31849225790.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/9c9663ef88539a0f5d0ec8b6f5d75a93/59806562929.pdfIn PDF document text
    • http://bvsaigonbinhduong.com/uploads/files/pasevarinijibodozomebi.pdfIn PDF document text
    • http://goraku-sangyo.com/userfiles/file/gamidapix.pdfIn PDF document text
    • https://le27.fr/docs/file/pajatizepubi.pdfIn PDF document text
    • https://amblamy.ee/upload/file/5123841126.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/252e693dbc130a297c45532638045c1f/45828578725.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/238e911bf7d6a79350dfd431ce7fb20a/renakan.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/95098612592.pdfIn PDF document text
    • http://titibbs.xyz/js/ckfinder/userfiles/files/34412589132.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/l5okmidsmpppqhdm8hl6jv9jb3/8939703536.pdfIn PDF document text
    • http://tolltisztitas.eu/userfiles/files/45661484583.pdfIn PDF document text
    • http://deauville.ru/files/file/32759233715.pdfIn PDF document text
    • http://csc0731.com/userfiles/file/20210718014102_50yof6.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/13701019689.pdfIn PDF document text
    • http://avondale61.com/clients/e/e2/e25739fb73bf6f2fbed92e75d980d6c5/File/kamapedufuxa.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090ceb63267e---66665747440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=lefort+fractures+pdfPDF link annotation
    • 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_off0000eb5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5A 18016 bytes
SHA-256: 57e1cb3b484034f53e1a3aee63ce83b581b21188064b62249e4419468a162d09
font_01_sfnt_off00011a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13241 10428 bytes
SHA-256: e68a0b15db3bad3c58d05f4b4c4fe32e052d70f05478190fb214d126480b0891

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