Malicious PDF — malware analysis report

Static analysis result for SHA-256 c535b28882ede100…

MALICIOUS

PDF

83.9 KB Created: 2021-09-22 15:10:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 7bfc585c9b57a36c773fcf88319e908e SHA-1: 9f9719db7e4ac9d73da39a57d7295b5bcbc25f22 SHA-256: c535b28882ede100556032a920f79e98ff822a4730ed15c18d693330ea132979
204 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. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document attempts to trick the user into installing a browser extension or update. Embedded JavaScript streams and numerous external links, many pointing to potentially compromised or disposable hosting, suggest an attempt to download and execute further malicious content or redirect the user to a phishing site. The presence of JavaScript points to T1059.007, and the overall lure suggests T1566.001 as the likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bertrandetgastineaudesigners.fr/userfiles/file/pazofa.pdf In PDF document text
    • http://lyzjkgm.com/d/files/79283286841.pdfIn PDF document text
    • http://flywings.sk/UserFiles/file/jovagapezi.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/46408264308.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16130c30370341---17483434957.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/daxagig.pdfIn PDF document text
    • https://iqrainternationalschool.org/_assets/files/dujikoreda.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/gr82fkseb90n9leruvj9ljtbf0/63844321743.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/38466289227.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/4d72906dea23cfcf02ba438e84c8e7b4/wuvama.pdfIn PDF document text
    • http://hmed.vn/upload/files/davaku.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/jikakofuwejuxopavilopi.pdfIn PDF document text
    • https://mtmnetwork.net/uploadEditor/files/60681465699.pdfIn PDF document text
    • http://chenruichem.com/upload/files/zidekejenowiwoxaweju.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16133b667f03cc---80393937213.pdfIn PDF document text
    • http://interwork.sk/userfiles/file/475999713.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/88384538873.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/45578065477.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/30114324216.pdfIn PDF document text
    • http://khyljg.com/uploadfiles/files/83911828255.pdfIn PDF document text
    • http://ikuma-car.com/js/upload/files/96945244584.pdfIn PDF document text
    • https://emons-verlag.com/testarea/cwsCMSlight/media/files/lotafidubo.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614966dc60830---nuzutesafu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=apk+downloader+chromePDF 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_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 17840 bytes
SHA-256: 201a66baa76497729f51bc80c0bb8a0c8a43e46c2079188c9d0608458370ebc2
font_01_sfnt_off0001122b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1122B 10580 bytes
SHA-256: e409e56867491aeb5a53f2385db4cf04c49e28b1e22d78abc1bc483d5f52b965
font_02_sfnt_off00012a2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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