Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea7eef4675278eb2…

MALICIOUS

PDF

86.5 KB Created: 2021-09-08 23:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5e48a6b2e5d4ac770d43b283ceb0417e SHA-1: 16411dc1a60d55cfd988dbae0c04f9ee16f6e364 SHA-256: ea7eef4675278eb2d65e9e34b9028738bb5893bafbad61c373f1d7e7e240f4c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, likely intended to redirect users to malicious content. The presence of external URI heuristics and compromised CMS upload links further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://smidgel.ru/uplcv?utm_term=boruto+episode+62+dub PDF link annotation
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/viluwidapevalugurag.pdfIn PDF document text
    • https://mywayrtk.com/userfiles/file/jotena.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/161314f5c0a876---68715570473.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/76432259017.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/82973600729.pdfIn PDF document text
    • http://ez-surveying.com/htdocs/cljr/data/files/wikenakepemap.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1a19e1850eaea47a9bd4f7571cc6b44b/98203911619.pdfIn PDF document text
    • https://ijmscr.com/ckfinder/userfiles/files/vesimod.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021090723135752.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/39459102557.pdfIn PDF document text
    • https://total-sport.pl/img/upload/files/91582398941.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/rawigux.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/52443052205.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/977bb72701abacb05402e28b29776e78/20127167630.pdfIn PDF document text
    • https://fgcrubochi.com.ng/ckfinder/userfiles/files/kaxakufatikoso.pdfIn PDF document text
    • http://www.binghan.my/userfiles/file/90039684403.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/nuraketimamanomar.pdfIn PDF document text
    • https://satuldelut.ro/ckfinder/userfiles/files/88251493817.pdfIn PDF document text
    • http://cablexconsulting.com/Upload/file/64406969107.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613902a09bc28---sajuzajelilemozoboz.pdfIn PDF document text
    • https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/a654336522c90824b7221c60741e795f/kefuwulojivosagewiwuv.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/73668462277.pdfIn PDF document text
    • http://novafish.it/userfiles/files/xogolonematalamuwepur.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_off0000e987.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE987 10652 bytes
SHA-256: c70fe9e024f1ffb2589a04ee4918555900003850669571e354dc11eb810eb35b
font_01_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 19412 bytes
SHA-256: ba6f8b687efb348ecd7c0fc41563726f5e14669e06e3a465f265bece691e4a17
font_02_sfnt_off00013462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13462 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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