Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbd39452e9870398…

MALICIOUS

PDF

81.7 KB Created: 2021-09-20 18:20:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: caa27dc68d5a7fea63456e02e41772ed SHA-1: 1ecc93a8661ea28a61e4ff0ac69197cdcabeafa6 SHA-256: bbd39452e9870398ab7de808cd33f1a3688fe86406b224f3d6ed218af81f7b54
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan. It contains embedded JavaScript and a heuristic firing indicates a 'clipboard command execution lure,' instructing users to copy and paste content into a shell. This suggests the document is designed to trick users into executing commands, likely to download and run a second-stage payload. The presence of numerous external links, some pointing to compromised WordPress sites, further supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://vncdata.net/app/webroot/uploads/files/49051837774.pdf In PDF document text
    • https://ecpa.fr/uploaded/file/vusunobenulasabipiw.pdfIn PDF document text
    • http://scuderia512.com/js/upload/files/dokoduselazivov.pdfIn PDF document text
    • http://ijdssymposium.eu/upload/43281172691.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/8c7c2faeb85bc93a78bf4258f70a029a/dojesiturale.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/161458f2a76983---xerazafevatagupot.pdfIn PDF document text
    • http://kk-gorenjska.si/uporabnik/file/72630703584.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/watuzowuborovuxare.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161429feac62e6---27678425204.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/wemotojimolazabor.pdfIn PDF document text
    • http://www.octopus-quatuorvocal.com/ckfinder/userfiles/files/62073091139.pdfIn PDF document text
    • http://e-sheremet.com/img/giboderilopumeka.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16143269ba773c---kamuvogiwuri.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/c52f7bf52dbf4347cd1ace7c631c8e4c/kemowus.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/89517330868.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/pirujujojubixurar.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/28977763388.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/raxamiju.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/61492078396.pdfIn PDF document text
    • http://www.cafeinca.com/img/public/contenido/file/21218859147.pdfIn PDF document text
    • https://www.sexualaufklaerung-schule.ch/ck/ckfinder/userfiles/files/73764121227.pdfIn PDF document text
    • http://serviphony.com/tinymce/jscripts/tiny_mce/plugins/phpimage/phpimage/upload/images/file/jaxox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=raspberry+pi+for+android+tvPDF 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_off0000daad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAAD 17688 bytes
SHA-256: a91429a094db5e80fd7b624ce8bdeb0630bdcdfa7bfaa3485810ed29b76bb1cc
font_01_sfnt_off00010876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 10808 bytes
SHA-256: 5a8565ecd877de8a7612d183e678060e99c8bfdaef4931be5101209b0d35904e
font_02_sfnt_off0001215f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1215F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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