Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce18ac4538eaf38f…

MALICIOUS

PDF

89.0 KB Created: 2021-09-12 04:32:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e94027b790ae7d1b79dfa1a6a293475e SHA-1: 6ff37a07e2a8b33f30b8a6cab301077878f88d84 SHA-256: ce18ac4538eaf38ff582b8885446d5c8e6eda1622974c4f6dc201bb0cb8d7220
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or use disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The primary attack pattern involves luring users through a seemingly innocuous document to external, potentially harmful, sites.

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 http://domadoma.cz/userfiles/file/gulijevirexod.pdf In PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/viritelojetefire.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/diwoxojefukinixog.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/gadudizazefufalegi.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16133c67008616---48656637665.pdfIn PDF document text
    • https://needlugs.com/userfiles/files/19821200176.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/piruzowaremodiweje.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/dibawimi.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/janaributinejoxilos.pdfIn PDF document text
    • http://robedecreateur.com/img/files/87101347310.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109072028344587.pdfIn PDF document text
    • https://alteanetworks.fr/img/file/nomebulokokos.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d544741899---nabepabovegovazanigulufat.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/30893332818.pdfIn PDF document text
    • http://arhive.np-sp.ru/img/file/jidexutakorarijave.pdfIn PDF document text
    • http://canvangdientu.com/images/file/16204017781.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/kegurosonitapujama.pdfIn PDF document text
    • http://sanzmendia.com/userfiles/files/51728630563.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d117bb6675---98230483021.pdfIn PDF document text
    • https://zhavezbozi.cz/data/file/rifitav.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339a021f9c2---85422549429.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/95390957161.pdfIn PDF document text
    • http://npas.ru/pic/file/gesowaturuluf.pdfIn PDF document text
    • https://arendic.cl/files/lofewilujalomoto.pdfIn PDF document text
    • https://songhongresort.com/img/files/333345366.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=3d+gba+games+downloadPDF 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_off0000f6a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6A0 18176 bytes
SHA-256: ed761dc2f57b3feb8a527c8769a6a4172cf346462848277db996cae0248a5136
font_01_sfnt_off00012608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12608 10604 bytes
SHA-256: c132aae7868115ef680fb1c26ee964b371d123573777ff0982ec1a065db9e5b1
font_02_sfnt_off00013e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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