Malicious PDF — malware analysis report

Static analysis result for SHA-256 6de34d0faed6d961…

MALICIOUS

PDF

85.6 KB Created: 2021-06-29 13:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4078d0ab6ed333cbb7c0ad2bcaa93f91 SHA-1: 6f7a6f46cc22610df0b2c8925aab0f459a67dceb SHA-256: 6de34d0faed6d961891b74b934afed20a813abd0a29f60fac9172ff87b6f6062
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate malicious intent, specifically a phishing trojan. The presence of multiple URLs pointing to potentially malicious content suggests an attempt to redirect the user to a malicious site for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/b48866fd2c0b7f7a1ff72df900783687/66124526590.pdf In PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160909cc5cdb4b---tovewivuxexopojitenetoso.pdfIn PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/28088700008.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d50b039a3---likewavu.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3ba25d052---nalokemivuxorekakuriveter.pdfIn PDF document text
    • https://kicksomeglass.com/wp-content/plugins/super-forms/uploads/php/files/0d685269d6d8779cd9c6a544a4cbf398/puguxilunuzetusemonor.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/pb9eodqh9o4310d5mi0jiflkml/tijesisukalufonowifuzi.pdfIn PDF document text
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/16082a933c83d8---30325606738.pdfIn PDF document text
    • https://parquesanalbertohurtado.cl/ckfinder/userfiles/files/89128621008.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16073d4635f2f2---86944332029.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3a83642981---topugatur.pdfIn PDF document text
    • http://asustainable.com/global/file/favuxuso.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/dc307e33373cb9086e5a85de03d26427/59116947684.pdfIn PDF document text
    • http://pinturasoltra.com/images/slider/files/polefazaxejapesiwaler.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/sabosulebosavubisad.pdfIn PDF document text
    • http://rolmech-strzelno.pl/Upload/file/divururesaxobisogima.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/podudurenedapisojapo.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084372bbf626---53904446817.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1116e1dd61---6864426789.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/katedijesat.pdfIn PDF document text
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/78d118ec4c60a8faec7927d81969d1d1/91898064982.pdfIn PDF document text
    • http://csc021.com/userfiles/file/20210625031613_5evwr3.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0cdd66f5---1593599016.pdfIn PDF document text
    • http://tlumacz-lipno.pl/pdrzewiecki/files/bugiwipufirewosir.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909afa3f7d2---70374070999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=kennywood+roller+coastersPDF 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_off0000ecf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10510 10460 bytes
SHA-256: af51e79bc70bf61a7c02ec24426f91c78f097552a12a470efae0d74a830519d6
font_02_sfnt_off00011d07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D07 16936 bytes
SHA-256: acaf2e351698da113fc2f0994b2f23c8ebba9614ad14b5637421a921ce447eeb