Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2b4757f467c583b…

MALICIOUS

PDF

136.5 KB Created: 2021-08-14 09:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 060f3548c7b1b2c8d519d51cdd6da799 SHA-1: 191666e5f8f40bd85f31fbd9d639b1f274019855 SHA-256: e2b4757f467c583bd9d69865920368a277d71a2041eeaeaabb3b2c92b7e42786
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious redirection tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://huntic.ru/uplcv?utm_term=terapia+familiar+tecnicas+de+intervencion+pdf PDF link annotation
    • https://study-abroad-travel.com/ckfinder/userfiles/file/fipune.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f381dddffd---96729570755.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/juberejumifemoget.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/3b8d03209d5f3ae1e03835d0364a6162/zumerokotixoz.pdfIn PDF document text
    • https://santevita-bg.com/ckfinder/userfiles/files/bakazimonaj.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/83171520914.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/33846663588.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210728_B8F9AB2A60FD8909.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/10258467783.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/58453283501.pdfIn PDF document text
    • https://safehouseservices.in/fckfiles/file/fimisewapobu.pdfIn PDF document text
    • https://digireg.nu/upload/ralalemeretasabefesame.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/virujepulejisul.pdfIn PDF document text
    • https://egyptsuntours.com/userfiles/files/13404968238.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/21b68deff7ffd536b8079aaf749a0d74/fofagenipixabezuwazase.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8025cbc65e---xumabudipu.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/rexudabimuf.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160920704cfccb---lebexozemixonu.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608867c125fc5---zipigetukumut.pdfIn PDF document text
    • http://elfuklid.cz/foto/Image/file/13416578804.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab22fcae86---mumamemixejuxizazexe.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee31b215cc---gawogumed.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70a62d838b---gizamozomuwunubepozut.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/80105174074.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_off0001b213.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B213 10812 bytes
SHA-256: ccc5bef61090acba566fb6c42acaa0d7449db14ce25a7adbb6dc4371b21d499b
font_01_sfnt_off0001cb05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CB05 18248 bytes
SHA-256: e394478f886e05a5bd92365b07c2f4811f0617b7d6cad505573f4f77ee84a8b5
font_02_sfnt_off0001f996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F996 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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