Malicious PDF — malware analysis report

Static analysis result for SHA-256 a230feef033b2e6b…

MALICIOUS

PDF

81.2 KB Created: 2021-09-16 12:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 2072c522f1900da625bec05bcc7986da SHA-1: 0cd3d338f6dd509c204212937805cc01703da66a SHA-256: a230feef033b2e6b7e9ffa7ebb9c4985bc681d91de68e5d689cd4e9c9444cdc6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external links, many pointing to compromised WordPress sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The embedded JavaScript and link farm suggest an attempt to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 https://coretry.ru/uplcv?utm_term=ski+safari+mod+apk PDF link annotation
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/161426423849cc---74957025644.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/zipivexatetaruvoxiv.pdfIn PDF document text
    • http://seosanhrd.com/userfiles/file/punazofunepajupuzivipoper.pdfIn PDF document text
    • http://xn--j1aii.su/userfiles/file/44873975774.pdfIn PDF document text
    • http://supragyn.cz/userfiles/file/41654370685.pdfIn PDF document text
    • http://ana-jsc.com/upload/files/94491005071.pdfIn PDF document text
    • http://elosc.com/upFile/file///ITX202109091306039114.pdfIn PDF document text
    • https://bdata.vn/upload/files/85766549760.pdfIn PDF document text
    • https://ceccarbotosani.ro/userfiles/file/77907422382.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/bijedusefobilipojol.pdfIn PDF document text
    • https://santa.my/images/users/00000000/files/rokomugigerivubolokaf.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/xarudulobuwew.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/4148983262.pdfIn PDF document text
    • http://kaitosushisb.com/uploads/files/mutoxa.pdfIn PDF document text
    • https://gadd-asso.org/userfiles/file/99975687571.pdfIn PDF document text
    • https://hygradeinsulators.com/images/uploads/file/77357990428.pdfIn PDF document text
    • https://razredna-nastava.net/files/zakuxobajapitapuv.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/63277625288.pdfIn PDF document text
    • http://www.radanhorse.com/resource/files/rakenebil.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613db4cbb162e---13176991978.pdfIn PDF document text
    • https://tasivn.com/upload/ck/files/meboze.pdfIn PDF document text
    • http://navigator-nsk.ru/userfiles/file/ragatanekafogaxedarofegem.pdfIn PDF document text
    • https://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba8f50df92---napozewubewovimazunokug.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1c0863cba---tusuxokaluripos.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cb2617da7e---10878715532.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_off0000db4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB4E 10444 bytes
SHA-256: 2c9b05fac316cd587e982ee9a5e4c5fef5fc86657f7bc92c89386ac9edc92a1b
font_01_sfnt_off0000f2f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 17612 bytes
SHA-256: f1b9cd9de9017279399e4b8f7379286b1c5941998f57599c3406d7a0fa696a0c

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