Malicious PDF — malware analysis report

Static analysis result for SHA-256 023875f0cdf9681e…

MALICIOUS

PDF

90.5 KB Created: 2021-09-22 11:28:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bfe83a6987a9be7b978eef37dc2406a4 SHA-1: 1dfe9f33b8bb3fa48de7063c1f2eb717a0604471 SHA-256: 023875f0cdf9681e33a074649e670a09b303fa5ce10c831a5f98334cf52121d6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm heuristics strongly suggests an attempt to redirect users to malicious content, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 https://wastran.ru/uplcv?utm_term=robux+codes+generator+2021 PDF link annotation
    • http://vektor-bezpeki.com/userfiles/files/16389648814.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/vevoxeguxosonowom.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/tududisubad.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/6cfb1de0837ec02965f2de96c2d0ee59/sanifawimopuzo.pdfIn PDF document text
    • https://mrdak.cc/uploadfile/files/pepepufalekaloniguxon.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/gikoligukomipolelizopopu.pdfIn PDF document text
    • http://www.sas.edu.mn/ckfinder/userfiles/files/1415066510.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/161337658b4932---bekivutotum.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/38626940346.pdfIn PDF document text
    • http://xy-interior.com/uploads/files/202109042255135509.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/saq9b5sqv7l3lga694lrhpjem5/dexik.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145a1a3b8e7c---vumurosalepozedebejapiv.pdfIn PDF document text
    • http://sooclose.eu/upload/File/17745257519.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/buwujedigobosubudugad.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/12897579572.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/kidijogogazekizuk.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/nafopulogov.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/dawizesib.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/retex.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/73275624066.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16142599bc3b4d---25920119982.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613abf91a64fb---zerugejawiwunitonopufu.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210916_205835_152.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/danesowulas.pdfIn PDF document text
    • http://888chji.com/userfiles/files/tunifoweluxavom.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_off0000f6ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6EA 19676 bytes
SHA-256: b8d078392c4019cbc7af466da85029a5c83457ba1a27a6259a8efae651626e1a
font_01_sfnt_off00012a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A2B 11088 bytes
SHA-256: 5118b908a2d7c25ea34c98e4358f0785dcecf29d2dbc8cd369363752787a52c1
font_02_sfnt_off0001441d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1441D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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