Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed25afbaf52a101…

MALICIOUS

PDF

83.3 KB Created: 2021-09-16 12:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b434b9ff7a6929e17565729eae2233e8 SHA-1: a31884b0712f466000c92995c923d8a2b5dbd591 SHA-256: 4ed25afbaf52a1015818a6e9eae633336b070e269f680da26d682721e72af56d
204 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and multiple external links, some pointing to compromised WordPress sites. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content is designed to trick users into installing software. This suggests a social engineering attack aimed at delivering a payload or stealing credentials. The embedded JavaScript likely facilitates the execution of malicious code or redirection to further malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 8

  • 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.
  • 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://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/57907491483.pdf In PDF document text
    • http://antropolog.ru/userfiles/file/futuxilabiwis.pdfIn PDF document text
    • http://wumag.pl/userfiles/file/43770473596.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/67826343998.pdfIn PDF document text
    • http://alotercuman.com/ckfinder/userfiles/files/10282074034.pdfIn PDF document text
    • https://ruta.hu/ckfinder/userfiles/files/jolepamafavoz.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/b6b53f1abd01e3eec36ed8c7830dfdb1/nuxatuba.pdfIn PDF document text
    • https://lazeo.nl/userfiles/file/satikulogukumavu.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/59995433467.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/57285813518.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/xibawile.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/faminimerugikodakawef.pdfIn PDF document text
    • https://www.utn.ac.cr/sites/default/files/files/lemuvilitukaduxazaj.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/65217198503.pdfIn PDF document text
    • http://czyxchem.com/upload/files/34390555216.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/28410389507.pdfIn PDF document text
    • http://seasonmediagroup.com/pic/file/17648608122.pdfIn PDF document text
    • http://weilandvloeren.nl/fckimages/tasodiganonopesuvori.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/92584062378.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/40451123396.pdfIn PDF document text
    • https://www.partyshuttlebus.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161375bb547fad---derujimug.pdfIn PDF document text
    • http://royalgoodviewresort.com/Uploads/file/sisudujobenosigezibo.pdfIn PDF document text
    • http://gemaeldeundobjekte.de/uploads/files/xapufedosijaxugefox.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161378dd798eae---lixijitumalemokejozada.pdfIn PDF document text
    • https://takipbizde.com/calisma2/files/uploads/87986225243.pdfIn PDF document text
    • https://stotex.rs/files/wizazafonafogiludozup.pdfIn PDF document text
    • http://lexus-custom.com/js/upload/files/barikakuminanofuze.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=your+phone+apk+downloadPDF 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_off0000e198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE198 17504 bytes
SHA-256: 3f1efd048b86c6f08ecb7baea1be378a947b588f3a267cc23669a27628cad32c
font_01_sfnt_off00010fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127BC 10392 bytes
SHA-256: c20b57cc8322a1fce0a92a584ac91ecb8f6b5f05c2cf06d6eb1f3999e79ed1e9

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