Malicious PDF — malware analysis report

Static analysis result for SHA-256 29518c5f833ad79c…

MALICIOUS

PDF

86.0 KB Created: 2021-09-16 21:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 009e385a9518e6246ee6a4e38a7147b7 SHA-1: a37e9f9172a48aa0fd715ac20c2c43d25cf7b37d SHA-256: 29518c5f833ad79c0deab6a963d7a8545edaa44e3e4a694b31158942b3a10668
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous links to external sites, many of which appear to be part of a link farm designed to obscure the true destination. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content likely prompts the user to install a browser extension or update, a common phishing tactic. While no scripts were explicitly extracted, the nature of the links and the lure suggest a potential for downloading and executing further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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
  • 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.
  • 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://catamma.ru/uplcv?utm_term=chrome+extension+apk+downloader PDF link annotation
    • https://shevian.com/images/file/96517234312.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133ff31704bf---batob.pdfIn PDF document text
    • http://hutnia.pl/userfiles/file/fuwosesoxobifedozivol.pdfIn PDF document text
    • http://pappteam.hu/userfiles/file/zenoxelegowezowuwixi.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/rojesavubobawabevapu.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wowirijikin.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/68674840737.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/37bfdd6e5c514cd4c04d27b01c90441b/moxufukixirova.pdfIn PDF document text
    • https://jokerprod.net/userfiles/file/romixen.pdfIn PDF document text
    • https://netiko.fr/img/Data/file/durirusapopibimos.pdfIn PDF document text
    • http://morakothotel.com/file_media/file_image/file/nedezugapimuduzanulawuror.pdfIn PDF document text
    • http://galerie45.com/userfiles/file/xoxetoneze.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/dulafuveza.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/e05f4017e9788432a8fd53990203c4bc/84086849511.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/2127495898.pdfIn PDF document text
    • http://chaodontuonglai.vn/uploads/ck_upload/files/pojenolizu.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/dusimipijegumome.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/nuresofomoganaw.pdfIn PDF document text
    • https://hankilfood.com/userfiles/file/20210914154842.pdfIn PDF document text
    • http://sluchatka-shop.cz/files/upload/files/jodobozomamelidopusananaz.pdfIn PDF document text
    • https://pvesc.vn/uploaded/file/72091756429.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161362e1e4b54f---3401399052.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_off0000eac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000102de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102DE 10968 bytes
SHA-256: 3b0540fa5065f210372d75ce62598685f1bec9edfcf7b51b2e0d228c37fe5d4a
font_02_sfnt_off00011c3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C3D 17852 bytes
SHA-256: cd37d84e8c842712b12fef27796481d7e9ef3ab3f9754ef09d881ef9b314b63a

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