Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa1e5544c044b5d9…

MALICIOUS

PDF

69.8 KB Created: 2021-09-27 00:17:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: df78aaabe234ce47b252d7938435a5e2 SHA-1: f6f43d5d0f275c0c993b53c54be9f4c5f8e74250 SHA-256: aa1e5544c044b5d95fac1311c52c1dd31d93f765888a2733f4b9d9be0d1dae46
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains embedded JavaScript and numerous URLs, many of which point to link farms on potentially compromised or disposable hosting. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common tactic for credential theft or malware delivery. The embedded JavaScript, while not fully analyzed due to obfuscation, is likely involved in executing the malicious payload or redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://specimport.by/files/files/23347099608.pdf In PDF document text
    • http://speckrepeg.by/UserFiles/files/35515463893.pdfIn PDF document text
    • https://comtraining.cl/userfiles/files/sixesi.pdfIn PDF document text
    • http://ipsaix.com/ckeditor/ckfinder/userfiles/files/79218346563.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/genitufokijinojosinasexel.pdfIn PDF document text
    • http://apmnir.ro/fckfiles/file/taremoxa.pdfIn PDF document text
    • http://weiddy.com/uploads/files/202109151804303010.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135d78a5d284---67828796253.pdfIn PDF document text
    • http://hmondo.com/userData/board/file/wusodukuwesamusexu.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/4f1f4939434cec56de6bfd80801096d4/62799488649.pdfIn PDF document text
    • http://machi-tomo.xyz/js/ckfinder/userfiles/files/6814531196.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fdc023386c---5519751880.pdfIn PDF document text
    • https://km2804.com/ckupload/files/21155059293.pdfIn PDF document text
    • http://www.ujepites.hu/userfiles/files/56103503326.pdfIn PDF document text
    • https://degardo.hollandpazsit.hu/ckfinder/userfiles/files/80545446694.pdfIn PDF document text
    • http://musorcentrum.around.hu/files/article/file/dawekotubiwis.pdfIn PDF document text
    • http://theprojectmanagement.guru/cote_dor_import/admin/ckfinder/userfiles/files/1862280944.pdfIn PDF document text
    • https://olterus.org/contents/files/kujivudogebutomitimoxuwod.pdfIn PDF document text
    • http://lagostena.it/userfiles/files/35332272799.pdfIn PDF document text
    • https://almentispharma.com/ckfinder/userfiles/files/80830089213.pdfIn PDF document text
    • http://rutka.pl/media/upload/files/dee92f1122f24935ae57e32bf9000f65.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/990d6aad0f313ff458ce92ab50e3d9aa/22311169106.pdfIn PDF document text
    • http://hyswimpool.com/userfiles/69176396224.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=android+bluetooth+keyboard+shortcutsPDF link annotation
    • http://cluster006.ovh.net/~greeters/namur/ckfinder/userfiles/files/jetozufizebiwowitofine.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_off0000aff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFF6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC80D 10892 bytes
SHA-256: ec20d74ab1261a3ab39c09cce9d812f9a5e3f01fe8bfeba90b7924fde8ba2e76
font_02_sfnt_off0000e13b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE13B 15788 bytes
SHA-256: 7198574d7a2cbeda68e1d88e7655e97e1444c84cb23f0a2d0a6b5b58d02807e6

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