Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f2461780faa666b…

MALICIOUS

PDF

87.7 KB Created: 2021-07-29 16:58:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 51c4d141bc7c3521d766d13f23f5907e SHA-1: a37fdfaa38f5754835216ca3bc1a12dd1f5044ea SHA-256: 5f2461780faa666b35fe5a2df334197fffca41fb6db8fbafacc6c0d79f0f1363
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier with high confidence. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, forming a link farm. These links likely lead to phishing pages or further malware downloads, consistent with a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://chcial.ru/uplcv?utm_term=cool+stuff+for+12+year+olds PDF link annotation
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/62902864834.pdfIn PDF document text
    • http://mengnuanua.com/app/webroot/files/files/tadepon.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/garusugadivuwavunev.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b0b7e69b---43439122128.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/acbabe01137fc3d58bf05699db873343/3028291718.pdfIn PDF document text
    • https://freedomhypnosisnyc.com/wp-content/plugins/super-forms/uploads/php/files/6b6194688706f6a27da65fc8d54e35e8/58609072158.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b41b755ea50---71650030888.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/6a09c5623943f4949a58e010ddba3f41/jusixoxuvikewalojew.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/koveminexebilejiku.pdfIn PDF document text
    • http://spreewaldatelier.de/img/editor/file/dopixabusobata.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/uh21kq820sk4o1v3lsb52ksgh7/xoxodepufuni.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160af6a63450ae---43038958544.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/99gsvh0adsh8o68fukmf35ubs6/24874082935.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/e52ca3acdf8a42ae457715058bcde705/33990413159.pdfIn PDF document text
    • https://x-software.cz/data/file/39644734205.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d71677e09---2089248280.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/344ad51504d6449a8126a67564049666/warogomido.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/68153379274.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa48a221f87---65092613284.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609262f2d8f76---sejaneku.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/vaxifatazilizizelubo.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/xafusetazotafumowuvuk.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/91918745165.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/45628092756.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_off0000f320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF320 10568 bytes
SHA-256: 1969486ad11b6111f99c6e59196b9caa26910ac6b5d218954944792b11dc89b9
font_01_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 17556 bytes
SHA-256: aae0692c840e26e4e7d8bd383e907bb30d7bceffd8033de0a23411ad23d1e63b
font_02_sfnt_off00013915.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13915 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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