Malicious PDF — malware analysis report

Static analysis result for SHA-256 78105fed75042ca1…

MALICIOUS

PDF

90.5 KB Created: 2021-09-03 13:22:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ac5ff6c8fe6d7082836c1da84a3bd2a3 SHA-1: 7de47d936498014b13e6de21ddb2d246d1e88299 SHA-256: 78105fed75042ca19bf69bed6de61592976bdff142c8323c394f5a016c0eba47
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs, many hosted on compromised or disposable domains, suggests the document is designed to redirect users to malicious content or download further payloads. The link farm technique, combined with the use of compromised CMS upload storage, points towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://medvor.ru/uplcv?utm_term=biotecnologia+industrial+vol+2+pdf PDF link annotation
    • http://artpolinakuzina.ru/pict/file/patus.pdfIn PDF document text
    • http://intestinalfortitude.org/clients/0/0c/0cf504f131cb0201443a7bd449519f4a/File/rinikoxuti.pdfIn PDF document text
    • http://quaint-house.com/images/blog//file/72065876942.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/32349771581.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/25132320372.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/27b00ae00a0a65b1a6512a2881fde93b/70555963259.pdfIn PDF document text
    • https://audit-advisers.com/userfiles/file/podejonim.pdfIn PDF document text
    • http://conganbacgiang.vn/app/webroot/uploads/files/31422713066.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/tv9np358cm3me95c20uvtoo7lq/78515864249.pdfIn PDF document text
    • http://gotoippc.com/ckfinder/userfiles/files/ziriso.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f058ada545---37273714046.pdfIn PDF document text
    • http://tucholainfo.pl/userfiles/file/10498918163.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/ba6ad79cd2909f7f512f07729c12db75/wuzufidodofowebofofaluraj.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///rekurod.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/59230896289.pdfIn PDF document text
    • https://samiznojmo.cz/wp-content/plugins/super-forms/uploads/php/files/b93639839ad5eafc6779c971462a6e27/doxejagexuruvarazaj.pdfIn PDF document text
    • http://onyx-innovations.com/assets/ckfinder/userfiles/files/pivafomofijilulelejuj.pdfIn PDF document text
    • https://genegurumiraclehealer.com/userfiles/file/xobusinatojujef.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608025ccaa885---587086544.pdfIn PDF document text
    • http://douzonebnf.com/upload/file///fodalavujozi.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3d862afd6181561d578a46401994d34e/23511811791.pdfIn PDF document text
    • https://eldorado777.ro/upload/editor/file/41020048558.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/rikasilomawaberawo.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/133e5f3085bf21089a3ccdb9246cd60f/15972067959.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/b9357227562b7ea3bfeabd776f64fcbd/26484364604.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_off0000f732.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF732 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010f44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F44 19396 bytes
SHA-256: 317b382fe4cd6216b7b875eb461faff79198a3f01c402c0af0ae2427bffc47bc
font_02_sfnt_off000141ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141BA 11136 bytes
SHA-256: 07771c291948df40069a18336564640717a3c46d1405bdbd4456eca5418001ab

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