Malicious PDF — malware analysis report

Static analysis result for SHA-256 4233e990a57a331a…

MALICIOUS

PDF

83.7 KB Created: 2021-09-20 21:03:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b65790f1435be1d28f80321e8431ed98 SHA-1: ec14dded41a254ceda3d2b0213aa6036ff24ac17 SHA-256: 4233e990a57a331a758329b6dcfdefe72484723f469602e300b84b5a315dc725
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and a machine learning classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URI heuristics and the 'PDF_SEO_DISPOSABLE_LINK_FARM' rule further support this. No scripts were extracted, but the overall structure indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://medvor.ru/uplcv?utm_term=descargar+descargador+de+musica+mp3+para+android PDF link annotation
    • http://m-s-g.ru/userfiles/files/vixobusevowutelasijana.pdfIn PDF document text
    • https://hcs1000.org/wp-content/plugins/super-forms/uploads/php/files/9bc8c6445d1e7a6eee2e9199a5fcd069/dorafadipowil.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/wixorimixijedenoxusi.pdfIn PDF document text
    • http://shopgraeagle.com/ckeditor/uploads/files/jamofewelewetorirafumexa.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/66545821382.pdfIn PDF document text
    • https://weeb.nu/userfiles/file/mesedasoseweja.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/tofokinofovimakusevoxuga.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/gefidejawewevidod.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/81658298013.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/mumokeludel.pdfIn PDF document text
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/161465b7fe71ac---jotubexozemofomanin.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/dobexuwuzusuwefuk.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/xagilizaxunimujagu.pdfIn PDF document text
    • http://geredekombiservisi.com/userfiles/file/vidibuwelibijumeporusa.pdfIn PDF document text
    • http://dvif.fr/userfiles/file/namexujosuwoti.pdfIn PDF document text
    • http://ocvitlucky.com/vietkiendo/upload/file/fezitexojin.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/31550990566.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/20029219275.pdfIn PDF document text
    • http://radyoislam.com/resimler/files/zurimak.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/9859578698.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138420aca90a---16059021490.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/40802287455.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/fonufivosepaluloxifugegik.pdfIn PDF document text
    • http://sgadsahodayatarntaran.org/sahodyatarntarannew/userfiles/file/sesenipujir.pdfIn PDF document text
    • https://rinducm1.com/contents/files/7320985225.pdfIn PDF document text
    • http://grabnerestriche.at/52844224498.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_off0000da56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF268 20400 bytes
SHA-256: 7a1270891e643a2f83b23de4d2c73b8dde886956b76e53c0417133d427bad9f4
font_02_sfnt_off00012612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12612 10984 bytes
SHA-256: 2edcbd319db6dd1649219a325bedfd17bd9654ee46a935d38341157aa52d54d9

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