Malicious PDF — malware analysis report

Static analysis result for SHA-256 96569c4aee423711…

MALICIOUS

PDF

77.8 KB Created: 2021-09-07 01:16:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b4a56bb78506c58e9e87d9c26db727e SHA-1: e7c810d39cb391289ad3bfdb6d258196b00df05e SHA-256: 96569c4aee4237118378fb5a218a556c38a4c2c0a53f07671a58525f4e1e3cf3
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many of which point to disposable hosting or compromised upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 https://clearpatth.com/userfiles/file/wowoxupatexufutepiweba.pdf In PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/sipojapoxawelowerero.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c6c726a51---bipamulupuzad.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108e98256940---melibifomagavo.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/80653247138.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/31315438517.pdfIn PDF document text
    • http://eprdel.cz/userfiles/file/xirewerelamekofiv.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/c0eed3ac6f7863e8158e8dc525eb49ac/zukusuwezogupe.pdfIn PDF document text
    • http://e-cluny.cz/UserFiles/file/gawegugajeruwabixez.pdfIn PDF document text
    • http://armiikrajowej36.pl/public/upload/ckfinder//userfiles/files/28192464560.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/99676182378.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/jizevifetipamozokez.pdfIn PDF document text
    • http://www.stratcareerservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608818ef0a301---16555731120.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce40e74e9dd---bodigesitumo.pdfIn PDF document text
    • https://myclubowners.travelenvogue.com/userfiles/files/64057150709.pdfIn PDF document text
    • http://dermaktif.com/imgup/file/89023114789.pdfIn PDF document text
    • https://elesud.it/img_pagine/file/18336557418.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/53735764445.pdfIn PDF document text
    • https://bedandbreakfastchia.it/userfiles/file/50577546094.pdfIn PDF document text
    • http://www.scsk12.org/policy/files/files/78569160011.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/c551747ad4f2bbc4bdc6e0709c5c71b4/18317523340.pdfIn PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073b46b0a5a2---25148469156.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=scanning+electron+microscopy+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_off0000cb6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE386 11152 bytes
SHA-256: 0b2c9e618d7e831b56f92c51670f4443b95ae5443e395b0780e94b43f5feae0f
font_02_sfnt_off0000fd68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD68 17228 bytes
SHA-256: 59399ecdac21381cd4f05cad4cd465cac0ceaf05e011703d5da9cb7af8748119