Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd90496c1d3b3b34…

MALICIOUS

PDF

70.3 KB Created: 2021-09-13 09:44:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a4e880121863dc1ef1a95558a7140137 SHA-1: 203889136f3d84df3aab9607c25db6c4e913f05c SHA-256: cd90496c1d3b3b3441227f5b2003001ab3dabbfcc2c51fb981bb6c786474d986
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary function appears to be directing users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9ea8b5277---82323546773.pdf In PDF document text
    • https://maconlux.ovh/userfiles/files/fudatujolijexukena.pdfIn PDF document text
    • https://reniuved.it/file/wozabivepemiji.pdfIn PDF document text
    • https://abzesolar.com/uploads/files/98726299999.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021090910584973499.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/lunij.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/gewopolubumijevolumuza.pdfIn PDF document text
    • http://longchimvac.net/app/webroot/uploads/files/rofepilodilesor.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/xokuzamarotine.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/8973750582.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613c503dc9fc8---lasovilezozezage.pdfIn PDF document text
    • http://yotlist.com/uniformkontakt/userfiles/image/files/82345852453.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/27093420735.pdfIn PDF document text
    • http://only-svet.ru/upload/files/xifad.pdfIn PDF document text
    • https://agrimal.pl/userfiles/file/lefakemug.pdfIn PDF document text
    • https://hgqq.hk/tony/churchofgod/ckfinder/userfiles/files/vowupigugetazonafemirur.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/welapamowudutu.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/rezogolalurudeb.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/65155240323.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/81856159091.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef37fd0ec5---10329396581.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/106106278be9966ece2c836160003b6e/98505066264.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398e5f91fd7---52118979640.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=ejercicios+para+desarrollar+la+creatividad+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_off0000b416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB416 15536 bytes
SHA-256: 8901859db1b304fa28beb1baacb1cf55ad3cf08ddf4f5718742fae21f164e115
font_01_sfnt_off0000da50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA50 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF267 10688 bytes
SHA-256: 3d4dedc5e04380305f7729cdb647c41b6c367e2f7cb5c6fe38ed3efc514df986

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