Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f73fc637b8d6b8…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 18:49:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 2a126676c7dda6d04ce2e2a1a428b5f8 SHA-1: 665dc7ca090829a392bd6143f90a5c0d67fdc3bc SHA-256: e8f73fc637b8d6b814a6498667675b8ab8fb209cc18a4dcf0af58ee311538af8
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://mandalaconfeccao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b23b5e10512---fudimojagefi.pdf In PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-6-6/20210606034257370529.pdfIn PDF document text
    • http://everest-c.ru/ckfinder/userfiles/files/10792568200.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/94868304994.pdfIn PDF document text
    • http://doradcyprawni.com/images/pliki/35921946422.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/3343564893.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/80055354463.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a7b917a6c73---73607430582.pdfIn PDF document text
    • http://naplesredeals.com/userfiles/files/muwududaru.pdfIn PDF document text
    • http://cobansut.com/userfiles/file/18445157342.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fe2b7ac275---gemilukosari.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/68796109673.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/84a6bfed60fd0ac9d9f714d0beaeb1d5/xawotoxumizonukuzoxet.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/81807360233.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1e22bddd0---wolafibufupaxuvur.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ba7584888f5---67857194006.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/tagisa.pdfIn PDF document text
    • https://shiphangnhanh.net/uploads/image/files/19191440694.pdfIn PDF document text
    • http://wooshin.kr/uploaded/file/170647210160e5db3762253.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/47750198916.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0e838aaba---34994376230.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/xelamarukaxamibojiwudi.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608052826a7b7---juwurote.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/13571406390.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/75061503381.pdfIn PDF document text
    • http://brickchamber.com/ckfinder/userfiles/files/batovejexirenanofofibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=divya+bhaskar+epaper+kheda+anand+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_off0000d68b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD68B 15644 bytes
SHA-256: 6b389f1dfeb6e9f348473047815b9bd64e5cdef41eeec2bf97bfcc9a3c9f3ace
font_01_sfnt_off0000fe2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11641 10744 bytes
SHA-256: 50ed67e1f38166a660b6e188e14bc02bbbc6ef9b8b9200ce9b63dd51baa14fe2

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