Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e4b5a63800c02bd…

MALICIOUS

PDF

86.6 KB Created: 2021-09-18 05:13:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 3c279c2b2d0e2569461912182b3ae230 SHA-1: 435bd6c55276c112d3cabba6e394f772dd3f1a42 SHA-256: 7e4b5a63800c02bdfa5791f6bbc5cbe6445afc4e3366ae92102e673fbb4ccdc7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised websites and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the primary attack vector is directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://laborke.ru/uplcv?utm_term=quintessential+quintuplets+puzzle+game PDF link annotation
    • http://wyadonline.com/userfiles/file/36839541077.pdfIn PDF document text
    • https://sahyadrisevasanstha.in/userfiles/file/digupidewetiwifib.pdfIn PDF document text
    • http://huyndaicaudien.com/upload/files/zixilekaxefubakozexolikel.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613be90031b24---nofugapetilifamowosa.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/96850086430.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/789ffcf1a9c1667fe340e9e7d8dc0cb5/kelex.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/29185467318.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/waxodapunagiziwokaje.pdfIn PDF document text
    • http://iccjsc.com/images/uploads/files/vibexuwejub.pdfIn PDF document text
    • http://dynamic1984.com/user_file/file/wuvijedetefupidogom.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/25683700032.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/90528530465.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/25610241558.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145285fdf52c---bikozeforurosoxawijenin.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db85f9a4b2---kutegawez.pdfIn PDF document text
    • https://orig-shop-gsm.ro/ckfinder/userfiles/files/67003216950.pdfIn PDF document text
    • https://akemi.ro/hirek/file/82487692339.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613be546e7f32---gularozonetemijaxiw.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/21754360532.pdfIn PDF document text
    • http://www.koeru.eu/failid/file/72553425240.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/57425508906.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/bavusaloba.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/92890465671.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_off0000f0bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BB 16760 bytes
SHA-256: 421235905b126267a7a346439ba80600fb70ea1ec747840413bdc49aa14c19e4
font_01_sfnt_off00011c35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C35 10740 bytes
SHA-256: c0395665cf442a20f4013416b3208257b4eaaae0dab9274816771c8df1c141db
font_02_sfnt_off000134b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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