Malicious PDF — malware analysis report

Static analysis result for SHA-256 6946ba3b8aaf7965…

MALICIOUS

PDF

76.6 KB Created: 2021-09-21 05:09:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bacfca24672b247300237ac0aaec99a3 SHA-1: 6d7ca1cb92608fe0b730f969398ba83e0573495c SHA-256: 6946ba3b8aaf7965a7a167d575306efc08dcddb70025bd89153d005e7ebfbca7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/11363442527.pdf In PDF document text
    • http://gadkowski.pl/repository/filemanager/file/45776684406.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/51737517039.pdfIn PDF document text
    • http://bamboomfi.com/htdocs/cljr/data/files/41975294097.pdfIn PDF document text
    • https://506hlapeta.com/files/file/39120437892.pdfIn PDF document text
    • https://hotelreviewreserve.com/basefile/hotelreviewreservecom/files/32112970816.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/1177044636.pdfIn PDF document text
    • http://hcbarrett.com/user_area/file/dotinepofanosekaguxopo.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/l8g5jt2g4l525t539ssnkb568j/15434012729.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/sn5g318ilanv7d8vr1i81vp22p/xupumava.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/83buevfrj97ska10u4s6la4le5/1325760158.pdfIn PDF document text
    • http://salocchi.it/userfiles/files/kexovipamokowamuba.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161482131769ce---biwar.pdfIn PDF document text
    • http://cga82.com/admin/File/witafubi.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/87616004320.pdfIn PDF document text
    • http://bellamy.tw/uploads/files/202109052006045101.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/49739220074.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/dbd5e682656470db8c9208ac031557c1/73386263671.pdfIn PDF document text
    • http://aotem.com/data/home/qxu1780220113/htdocs/uploadfile/files/defuxozatox.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/74e96c81db2cc6c5a490f016f36b4e96/mifasugaduwo.pdfIn PDF document text
    • https://www.sudicobank.com/ckfinder/userfiles/files/43773449630.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136fcb57905f---21952461969.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/bobuwilawojexumuki.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=asphalt+8+cracked+version+for+pcPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c71b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF2D 16980 bytes
SHA-256: e331b81138c5623a06c3bfc7dbecf0f18f1db7c3df01263dd9c5b72201621615
font_02_sfnt_off00010b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B0D 11064 bytes
SHA-256: 842096205e610c7532a8250788b04822754f14763f13b32f7741d48e79f24bd6

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