Malicious PDF — malware analysis report

Static analysis result for SHA-256 2da8e4702382d456…

MALICIOUS

PDF

79.9 KB Created: 2021-09-13 10:10:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2ff758490d8f336605dce713b03719f1 SHA-1: 4a5089a796753141c37d219af47f609f2daa4534 SHA-256: 2da8e4702382d45632c75cb296f79ed15e88b9acd3dbf919d4b58eaf31ac44b9
196 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a browser extension installation lure. The PDF contains numerous links to potentially compromised websites, suggesting an attempt to redirect the user to a malicious download or phishing page. While no scripts were explicitly extracted, the nature of the lure implies potential JavaScript execution or exploitation to achieve its goal.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://avvocatogiuliani.it/userfiles/files/vomazijilafifevezatogud.pdf In PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/gusibepuwulidoxuzizag.pdfIn PDF document text
    • http://www.enfersalus.com/ckfinder/userfiles/files/zebumotimu.pdfIn PDF document text
    • https://yumasri.com/assets/ckfinder/userfiles/files/ganukejogerovemameligep.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/lojarudufa.pdfIn PDF document text
    • https://bohemiamaestro.com/webpagebuilder/ckfinder/userfiles/files/9024663490.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/pukipirodojugega.pdfIn PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/15953381832.pdfIn PDF document text
    • http://logisticsnetworks.net/ckfinder/userfiles/files/wapub.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/64c08c8c6a15a1246bd8ba5f689523ab/33765309393.pdfIn PDF document text
    • http://autolavaggiocraparotta.it/userfiles/files/31110212357.pdfIn PDF document text
    • http://bassbasement.org/userfiles/file/tavutidanofugigazunalez.pdfIn PDF document text
    • https://norservis.com/files/files/powuzepuxa.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/22088350393.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/3693969339.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/31b9c1b74c03a9d7098af736d77f4a7f/wodisufidenixojamutoxun.pdfIn PDF document text
    • https://sooryasales.com/uploads/file/15760493905.pdfIn PDF document text
    • http://webcertain.ca/contentupload/fckeditorUploads/organization_/file/ramavevabefo.pdfIn PDF document text
    • http://jtravel.clickis.kr/FileData/ckfinder/files/20210910_BCD7A5345FECADE8.pdfIn PDF document text
    • http://glavis.biz/userfiles/file/64250607443.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c175a1abe---gufogubaburu.pdfIn PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/gakokarexiwasimasosiwux.pdfIn PDF document text
    • https://mimpishio2bet.com/contents/files/21485505964.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f515821d51---35145921487.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=connect+my+phone+with+my+laptopPDF 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_off0000d388.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD388 18092 bytes
SHA-256: 285282a980921eaf3fb6fcfb328f9e832060140c470a0559c4abdf8c4852088f
font_01_sfnt_off0001020b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011a22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A22 10604 bytes
SHA-256: f7f67713acd5a17529567943ec4ccfff106f4c753f67ac85db9627750fc93f26

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