Malicious PDF — malware analysis report

Static analysis result for SHA-256 778268fa2af8be46…

MALICIOUS

PDF

86.3 KB Created: 2021-09-04 11:02:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 7bd8ef7ecc560fee911723e901b45d6d SHA-1: c0da4a133c8a104f53d1a86b131315fbbd225c4a SHA-256: 778268fa2af8be467f6f904a2ae9de70fd3d0ced1be2cc0cc48967265700773f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting PDF files. Heuristics indicate this is a link farm designed to direct users to external resources. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 6

  • 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.
  • 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://namastehealth.in/wp-content/plugins/super-forms/uploads/php/files/cd7lbdu0vmhu4bbl7qtgv21hhu/87101076843.pdf In PDF document text
    • https://macroedunet.com/userfiles/file/3053764979.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/5stkp7npnjdou8p90ib3amu5kn/52077631671.pdfIn PDF document text
    • https://ebdaatcoop.com/userfiles/files/lujodopetukuwebuz.pdfIn PDF document text
    • https://ntpuvoice.com/ckfinder/userfiles/files/60407835492.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/99845803405.pdfIn PDF document text
    • https://zlatartopalovic.rs//files/nivitofiwojiraniterevazef.pdfIn PDF document text
    • http://gabortech.com/admin/file/62900818565.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/naxukevot.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ac24b6b1c88---20003186816.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/mufarikajelonenuruxajodeg.pdfIn PDF document text
    • https://thehero88vip.com/ckfinder/images_store/files/kuromijamanebut.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2245de0f93---wolazilibiloduwiwan.pdfIn PDF document text
    • https://castel.ro/userfiles/file/60221479707.pdfIn PDF document text
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/sovoj.pdfIn PDF document text
    • http://jx4d.com/userfiles/file/48962229634.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc039a3d48---nefuwalekedigulizijag.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/b24059db92b3b9caef2204fe38407ea1/93426618944.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/fddc6ff7d85468c22cfea5a896697267/mukijulomir.pdfIn PDF document text
    • https://vietucmould.com/img-vietuc/files/vazigeledavome.pdfIn PDF document text
    • http://ilovechardonnayhills.com/userimages/89927173580.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee3dfa4dfc---purubewolavudegod.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/16112b3f13b60a---83724865462.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/fb92028bcdeb25926556928f1337bed6/tamovifezudor.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/89530638823.pdfIn PDF document text
    • http://sieuthivatlieuhoanthien.com/upload/files/zudajar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=comment+parler+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_off0000e740.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 20484 bytes
SHA-256: 0c6cbfb785f7272233719bb911b83c7f1e0473c76df3d012b01c55e9745f5809
font_01_sfnt_off00011ab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AB9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000132d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D0 10432 bytes
SHA-256: 2794b85fe21f240edeb9476fa37739c03060d138308baad248b86289dcc1d991

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