Malicious PDF — malware analysis report

Static analysis result for SHA-256 659f0c286db3b1bd…

MALICIOUS

PDF

80.5 KB Created: 2021-09-10 15:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3bb28cfc5e2a10ef9600673f616d1d92 SHA-1: a19543a3a84551ee4658fdc32408dc379be55305 SHA-256: 659f0c286db3b1bd44e2cd4520a6c5a828022e77accc555f56465ddec495c1e7
156 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress upload storage and other disposable hosting domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to phishing sites or download further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/gebofarosokisuziwexogu.pdf In PDF document text
    • https://italvaping.com/file/ginuwu.pdfIn PDF document text
    • https://balajitutorial.com/admin/userfiles/file/11461410138.pdfIn PDF document text
    • http://konakelektrik.com/userfiles/file/28661438815.pdfIn PDF document text
    • https://trainova.com/userfiles/file/82524559211.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eb35b48fdb---59014532616.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137deb1c08f7---nudosikunadinatogugowud.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-2/20210902142417154597.pdfIn PDF document text
    • http://studiotecnicostradi.eu/userfiles/files/gixozaruji.pdfIn PDF document text
    • https://itexpertdog.com/upload/files/pezakilabetizo.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/55534160114.pdfIn PDF document text
    • https://lighthousemacau.com/html_upload/file/64715664336.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/27559664582.pdfIn PDF document text
    • http://aaas.handyfriendship.com/upload/files/97236840302.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16139d4c47de0b---9800077807.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/161379edd71611---7318439772.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/95821943896.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/lesajogejidakasepesare.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/4938057f53aa8667c75d4e65f335ab65/nekukiwapoxomuge.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161381f2a03fc9---77276216494.pdfIn PDF document text
    • http://transcash.com/ci/userfiles/files/25929992931.pdfIn PDF document text
    • http://breakevenpoint.pl/uploads/editor/file/43218140927.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161332094bf9f3---bigedibuviwinuv.pdfIn PDF document text
    • https://uangraja.com/contents/files/rigajobo.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210902_97A91D35A92AF0AB.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/tovabituvag.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=multi+tab+browser+androidPDF 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_off0000d8bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BB 16816 bytes
SHA-256: 7e5611e11cec84863fa8168d7b9639a5d1e8265ebb29b269f4406581d3c82992
font_01_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011bed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BED 10560 bytes
SHA-256: 3c547a29b445b7d209dc9aecc00270c6ab70879db8b0d7a47f76a93436364118

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