Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d4b6fec3fddab7…

MALICIOUS

PDF

91.9 KB Created: 2021-09-04 07:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5d527620d4b979fc6ebe42de1245c9d2 SHA-1: 4a9767b21047c55db371e10b68f1e6ba7b6f2273 SHA-256: b7d4b6fec3fddab7ecea9daf40de93fa7f16b341e273dc44d50edcb4ce5ffc40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution via the embedded links. The embedded JavaScript is likely used to facilitate the redirection or download of malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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 https://krisoc.ru/uplcv?utm_term=graduatorie+medicina+2019+pdf PDF link annotation
    • http://www.aaar.cat/assets/js/ckfinder/userfiles/files/fawupopex.pdfIn PDF document text
    • https://nhatngudongkinh.phapluatvietnam.com/upload/ckupload/files/zufuzozimeb.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/27f0f3bc18b0cfbc31ee89845bb3ab23/welemofimometene.pdfIn PDF document text
    • http://rabotatver.ru/userfiles/admin/58914145843.pdfIn PDF document text
    • http://susasoft.com/upload/userfiles/files/bofemelorajegoduzesogomer.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5753f87733---88683045001.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160e13fc1cbf36---49405241266.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/rufutilugijefikeluri.pdfIn PDF document text
    • http://crystalnymph.by/wp-content/plugins/super-forms/uploads/php/files/7ad53c2bc81342d37051d25214e1166d/55169452742.pdfIn PDF document text
    • https://ukdirectremovals.com/wp-content/plugins/super-forms/uploads/php/files/1e205af5b89a637be1f49e156c3022b4/33124603100.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/22591690446.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d2ff08d65a---90932605822.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/91rh1vkbrq211o212qdv3tfj43/remuj.pdfIn PDF document text
    • http://yildizteknikelektrik.net/resimler/files/68298507869.pdfIn PDF document text
    • http://ustunongel.com/image/files/kagorufuzuxus.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609464ef1c199---xisozoketom.pdfIn PDF document text
    • https://ccskin.com/geektic/files/panowasikiwubitafa.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16107b9cf4d1a4---limal.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fb57c0f02---dixugozadamugen.pdfIn PDF document text
    • http://savvyais.com/userfiles/file/13498242982.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bc3a446139---42911256825.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8b8e8b9204---buzuwitomilolot.pdfIn PDF document text
    • https://eslms.com/userfiles/file/19387625198.pdfIn PDF document text
    • https://maggies-handmade.com/UserFiles/files/46426351264.pdfIn PDF document text
    • https://tl-systems.hu/files/files/malijujiwo.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_off00010160.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10160 11168 bytes
SHA-256: 39838c9bef6a03cf6b183d258d4d8abf78161d9c265bd511341c53870bbb95cb
font_01_sfnt_off00011b8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A0 17608 bytes
SHA-256: 6dcee82c75bae1cc947ce906e58800a2aaf9e0a1ed8e4f316faa71515398958e

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