Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13a5862cfb89af7…

MALICIOUS

PDF

116.1 KB Created: 2021-09-21 09:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 60e774eaf2c19ff40339bb7569a95837 SHA-1: b6ef8e7d88bde1eea8bb0db11c618db2391250c0 SHA-256: e13a5862cfb89af789a07002e571a98bb7f15af1b44211f0772161f57bf8c007
196 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it's a link farm and a social engineering lure to install browser extensions or updates. The embedded URLs, while some are marked benign, point to compromised domains and disposable hosting, suggesting a phishing or malware distribution attempt. No scripts were extracted, but the overall pattern suggests a phishing attack leveraging a document to trick users into a malicious download or installation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://www.de.ruben.pl/ckfinder/userfiles/files/80710847831.pdf In PDF document text
    • https://bursakaynak.com/userfiles/file/kesemadudoti.pdfIn PDF document text
    • http://rideco.hu/upload/file/82887929544.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/vre83pobri4kin36lp4pos115t/kujejo.pdfIn PDF document text
    • https://www.bbmnetlicitacoes.com.br/cms/ckfinder/upload/files/laperobedokam.pdfIn PDF document text
    • http://crm333.com/documentos/file/76105189406.pdfIn PDF document text
    • https://konteshamamotu.com/userfiles/file/tipoviwifu.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/zabozepixivetewuvamunox.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613517008de42---17413374984.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/8813131249.pdfIn PDF document text
    • http://vanxuantravel.com/upload/files/8013080731.pdfIn PDF document text
    • https://xn--atpta-nfb.lv/images/userfiles/files/28187644486.pdfIn PDF document text
    • https://suacuachuyennghiep.com/uploads/files/57572571218.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/jaxepirogano.pdfIn PDF document text
    • https://www.moxiclear.com.au/application/third_party/ckfinder/userfiles/files/bexaweweninesuleriwijizo.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/sixutowo.pdfIn PDF document text
    • http://mgrima.com/files/file/nodatugoxulariposoporen.pdfIn PDF document text
    • https://aildf.in/userfiles/file/66774181100.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbde014bb8---bomugosulumazuwakimolut.pdfIn PDF document text
    • http://biznesfishki.ru/files/userfiles/files/74610736769.pdfIn PDF document text
    • https://seeandhearbetter.ie/img/shop/contents/kakojavufutumepazitu.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/kudirafufunoras.pdfIn PDF document text
    • http://clubselectionvoyages.com/images/file/mujorerevufalulemawoji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=windows+10+update+from+command+linePDF 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_off00016158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16158 18264 bytes
SHA-256: cb0431fd016bfbd1a41b2bb7f197ce2e551daf21bb38aec4ff4e80ab648b62a4
font_01_sfnt_off0001904d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1904D 11132 bytes
SHA-256: 4f8b3639ee3fd2efb8e4613a1632cc0dbae7f8b75173d9633b20429c68d7a72c
font_02_sfnt_off0001aa61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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