Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e772cfe82fa6587…

MALICIOUS

PDF

98.2 KB Created: 2021-09-05 02:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 91761a61a425ac113b60d756b6357392 SHA-1: be3ef42ebabf12cfba325f3da7bcbda985ab634b SHA-256: 3e772cfe82fa6587459a1eaf3800f442d69982e31d2225f1c1cc2ee1c179d9a6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. It contains multiple external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users. The 'SE_BROWSER_INSTALL_LURE' heuristic indicates the document's content likely prompts the user to install a browser extension or update, a common social engineering tactic. While no scripts were directly extracted, the PDF structure and embedded links suggest potential exploitation or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 https://nomylo.ru/uplcv?utm_term=nyc+doe+field+trip+permission+slip+pdf PDF link annotation
    • https://gulfb2b.com/userfiles/file/69729722935.pdfIn PDF document text
    • http://jsushibrea.com/uploads/files/tiduxowufijomidarigigali.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/8bf55bb9d15988e2e961628e6e1b46e9/puwamutenanakawugotuked.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16096750264169---buviwikaxababeze.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/160e43511e4d47---xelobot.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/gedebididelasuvat.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e6f709f0---buvugegasemedavajikisef.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/57109896424.pdfIn PDF document text
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9557d3daf0---45761253950.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1612f77c1b5a0b---fidixigoxosisakubazi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2721c6ccf---sutifojunonojazeb.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/43062444784.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/nibaxipazakak.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1608b50a9e4cc8---pomisibowasoxafalodeni.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/cvabqvckdnlb2lm20h0pdb10c5/77016648914.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cc579096a0---74499918520.pdfIn PDF document text
    • http://salon-urody-bellis.pl/images/file/pibagup.pdfIn PDF document text
    • http://akvari-um.ru/userfiles/file/15420844416.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/66292969765.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/f76a6b68bc9a18ad77bff09f06aab791/tolafalibo.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093cfb4748ad---39745517370.pdfIn PDF document text
    • http://makinsushi.com/uploads/files/murupizotip.pdfIn PDF document text
    • http://kusadasidentalclinic.com/img/userfiles/files/62306568544.pdfIn PDF document text
    • http://viajesalaos.com/webroot/img/files/zesidabaronovagarigano.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be0dd96d2ed---76292165482.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aec152851---vibemidefegosujo.pdfIn PDF document text
    • 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_off000117ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CA 19112 bytes
SHA-256: 6b4000eebacc6f435484735bf3ef92fd972a9da7f2e3d0001813b9d04b9f4e88
font_01_sfnt_off000149e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000161f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x161F8 10708 bytes
SHA-256: 2c68b06f874353db93ea38df439aa19dbe32585c3c2fd2e5f5950dccdea34348

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