Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9f23f5091a8d857…

MALICIOUS

PDF

94.2 KB Created: 2021-09-17 21:09:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6535bf03e9e57033cff5091034c12b40 SHA-1: e6d19e1eb3cff172ccf61aa0c587c302a53311ee SHA-256: c9f23f5091a8d857c2fcccb7491dfae4ccaef24af43b451bde270942dc35d057
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://a2kat.ru/userfiles/file/53027704945.pdf In PDF document text
    • http://mywayrtk.org/userfiles/file/78845492833.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/b308ea7a1cd387c3cab897e05cd55765/29010940563.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5ff2a6b3d---sesepuwerozeripukudoz.pdfIn PDF document text
    • https://inijariku.com/ckfinder/userfiles/files/tuxaraxevifusu.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/bowunasepipegujuzewex.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/lavunonarikubano.pdfIn PDF document text
    • http://ubest.ru/images/file/93519929246.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/161373104c62e7---divadatebumopomav.pdfIn PDF document text
    • https://badoza.net/userfiles/file/kenafipamojaxajasaxisez.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/25052992152.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613f358ece553---43187767650.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/55364351281.pdfIn PDF document text
    • http://lawfirm.vn/MINH/user_files/file/gudidinabebawifofoti.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/11742366375.pdfIn PDF document text
    • http://www.creativitaecomunicazione.it/js/lib/ckfinder/userfiles/files/lulimozonadol.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/93229621294.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/kerimugegolafozoxupobof.pdfIn PDF document text
    • https://lorus.rs/files/damifejufesiko.pdfIn PDF document text
    • http://ozdermusavirlik.net/userfiles/file/24927901565.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/27649593497.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/kebaxamonobosunef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=cheat+no+cooldown+mobile+legend+2021PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C4 24816 bytes
SHA-256: 48a6993294cda57eb1d9ef64579197ac87020cd2d721ffdd3e76108c9e0afa30
font_01_sfnt_off000121a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121A1 16600 bytes
SHA-256: 42af77a991dfc56b049997f7dffcef127f136c3ed14271a4e860e68c4ff5c2bf
font_02_sfnt_off000138f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138F4 11100 bytes
SHA-256: 9b3f97dbc4a2e236a32902788edc1310d771764acf451c3b6d6d6415c9c132e1
font_03_sfnt_off0001528c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1528C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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