Malicious PDF — malware analysis report

Static analysis result for SHA-256 65773e46affa6604…

MALICIOUS

PDF

82.9 KB Created: 2021-09-02 21:29:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2d192900e8c4cfb7a3d3fc81746574f3 SHA-1: 432156efe46e06c0ae47906a66c46f6228eaf458 SHA-256: 65773e46affa6604c15d688aa8aabd53444473c8cb5ae7261a926d05a3430536
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that the sample leverages compromised WordPress upload storage, suggesting an attempt to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • 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://xyr59.com/filespath/files/20210826180433.pdf In PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/q8cvsbbl8bo1gp2uhhmna15mvo/37533723675.pdfIn PDF document text
    • https://dalnoboy.com/data/filestorage/upload/files/vusoli.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609893cd3a82c---jipasizub.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612a61515e2c0---motabirepevuwulixagew.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/fanajabal.pdfIn PDF document text
    • https://weblative.com/wp-content/plugins/super-forms/uploads/php/files/iiqdh0083n4tbkkbl8k82hnfot/91418918801.pdfIn PDF document text
    • https://jooli.ru/ckfinder/userfiles/files/falodo.pdfIn PDF document text
    • https://gloriouz.in/ckfinder/userfiles/files/50913636191.pdfIn PDF document text
    • http://crosswaysrecruitment.com/userfiles/file/bokunovijiseniripot.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/160703bc963989---sobuxixelujuvefobixewa.pdfIn PDF document text
    • http://brightwayconsultancyservices.com/userfiles/file/4240753979.pdfIn PDF document text
    • https://topupdana.com/contents//files/vewugalenejo.pdfIn PDF document text
    • http://neilreardon.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/47680384235.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/29968681519.pdfIn PDF document text
    • http://marleenjansen.nl/images/uploadfiles/gajazi.pdfIn PDF document text
    • https://www.natursany.com//ckfinder/userfiles/files/5099584708.pdfIn PDF document text
    • http://jhdjt.com/images/upload/File/50679715149.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/17745987564.pdfIn PDF document text
    • http://canadanur.com/resimler/files/kajib.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b73ad515c56---43123145649.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609063fbb1cfe---vemedo.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/repom.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=innovation+process+stages+pdfPDF 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_off0000dfea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEA 10764 bytes
SHA-256: 75ee2a246aba63bbd7486d2e55fa7a35e775c7138e28c6655816fe45d4415355
font_01_sfnt_off0000f8a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8A2 17784 bytes
SHA-256: 60014e3d8bc9b53e254f2f1746a0e4e250cc3f7f785173eeb38698e0f19165bc
font_02_sfnt_off00012664.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12664 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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