Malicious PDF — malware analysis report

Static analysis result for SHA-256 467615a67ae90b95…

MALICIOUS

PDF

79.6 KB Created: 2021-09-09 08:16:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: aa6a1bbdff055484e4a1a06e6c486f8f SHA-1: fad044b0d540b6408503c287977f9f301cb00675 SHA-256: 467615a67ae90b95717527c49377cfd0f2594b51b5125cec95a4a6809deeb158
196 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various PDF files hosted on potentially compromised or disposable domains. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document likely prompts the user to install a browser extension or update, a common social-engineering technique to facilitate malware installation or credential theft. No scripts were extracted, but the presence of multiple external URLs and the lure suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://stellarp.com/userfiles/files/pakewo.pdf In PDF document text
    • https://mccartha-cobb.com/userfiles/files/tikamosisezufuvupum.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/porip.pdfIn PDF document text
    • http://condosworld.com/abisol1/userfiles/files/2908842890.pdfIn PDF document text
    • https://monamifrance.com/FileData/ckfinder/files/20210904_29D43234EAFD9DD9.pdfIn PDF document text
    • https://shrmivirtual.org/wp-content/plugins/super-forms/uploads/php/files/39649876fde23151cf1f1e28a82139eb/mazozixigidewilesimade.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/77112294529.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/042025be6aa1dfe3be6ab79ff75358d2/xefodejewivefozidafopu.pdfIn PDF document text
    • http://szcftz.com/upload/16505425299.pdfIn PDF document text
    • http://musiclivemarsala.com/userfiles/files/44816869226.pdfIn PDF document text
    • http://thebankcardservices.com/uploads/files/83220346371.pdfIn PDF document text
    • http://thepokewave.com/uploads/files/17083309342.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/24943508915.pdfIn PDF document text
    • http://starwindows.ie/ckfinder/userfiles/files/fibapajeradigudozokajuvi.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/18887995885.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/69300431644.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161374b205b02a---90454130267.pdfIn PDF document text
    • http://keitbg.com/images/files/36410399330.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/50e4a81d506c36f1cdcd8bf4f7d6c760/kisifajodaxuwetewujezuju.pdfIn PDF document text
    • http://ariogalospspc.lt/userfiles/file/visixodipirafevedakor.pdfIn PDF document text
    • https://auto826.vnpec.xyz/uploads/files/31239779655.pdfIn PDF document text
    • https://www.peltonfell.org.uk/ckfinder/userfiles/files/55971635187.pdfIn PDF document text
    • http://captainkillmite.com/uploads/files/202109091059163602.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613562bd762a4---gedinoponuxiropi.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/moketofuxam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=smart+iptv+apk+download+freePDF 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_off0000ce03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE03 19256 bytes
SHA-256: 40ac7a83a92079c747adf30e56e026c4dc0706e4911fb33cc774663fed79aa79
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 10812 bytes
SHA-256: b51dcbd042689c138012a5ee1d5bf93e07310ea1596324a1a3b199f41ef0d16f

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