Malicious PDF — malware analysis report

Static analysis result for SHA-256 86a3e4deb63b5c1f…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 18:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 98c18e6df70030d2b91567d99c75f340 SHA-1: c5fddf16dca927497fc40e85513934407a573b8f SHA-256: 86a3e4deb63b5c1f19cdffc40180501150ede96dc776863cfc6ff9b5136ed688
164 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier. It contains embedded JavaScript and numerous URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further exploitation or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

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://huntic.ru/uplcv?utm_term=thumbnail+mod+apk PDF link annotation
    • http://ttlh.vn/storage/ckfinder/files/64860076405.pdfIn PDF document text
    • http://sokole-tps.pl/userfiles/file/25301945397.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/59424914268.pdfIn PDF document text
    • http://thaiboxes.com/piceditor/file/mubirevomuwapolamu.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/vexupitim.pdfIn PDF document text
    • https://sfeerweter.nl/userfiles/files/56035256683.pdfIn PDF document text
    • http://iphysiology.ru/upload/fejopafesalaramev.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/8233259321.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/453efe38d4e0fcb6e997e1fb08b9c69b/vejilipafezipoganuranekud.pdfIn PDF document text
    • http://fgosvo.ru/files/files/jobewapu.pdfIn PDF document text
    • https://luatkhangthai.vn/upload/fck/file/kewutumomubi.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161427b7fe282a---busizefugusanow.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/zalilagogujexadodi.pdfIn PDF document text
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/woburuzo.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/161377b8af17eb---meviburixogawot.pdfIn PDF document text
    • https://laptoptranganh.com/data/dulieu/files/wavotasetifusapunuvibuzeg.pdfIn PDF document text
    • http://giorgimpianti.com/userfiles/file/3238617111.pdfIn PDF document text
    • https://bitree.ru/ckfinder/userfiles/files/42439293233.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1613750d4163b8---57938863566.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/2076351598.pdfIn PDF document text
    • http://dulichgiahy.com/upload/file/wedofuju.pdfIn PDF document text
    • https://gregoryshow.ru/files/file/7412543251.pdfIn PDF document text
    • http://autoescuelatosal.com/galeria/files/37143328195.pdfIn PDF document text
    • http://pawsandtiaras.com/ckfinder/userfiles/files/45334809314.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138fdec8449d---88162085767.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/48021285544.pdfIn PDF document text
    • http://cdjuchuan.com/upload/files/sujumaguwaw.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_off0000b526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB526 10452 bytes
SHA-256: d6b7b2f83367f6a4bf603afaf59f4990a93c3f4498203ef4c5b6383eef3d23f7
font_01_sfnt_off0000cc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e461.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE461 14420 bytes
SHA-256: ff584cadc0bc60bfdf4e466466ce05b26b38dbf6c15a44529a828181268c06af