Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f65cdd4715418a6…

MALICIOUS

PDF

97.0 KB Created: 2021-08-09 19:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 384ef3233fe1435e6b715408376fec95 SHA-1: 18e5eba1647b8ffd0d3a428029f9a24f0ad3edaf SHA-256: 7f65cdd4715418a60fa69daa19f7bede86ad97326cfd461ddde3a8147098e9c3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a large number of external URIs, many pointing to compromised CMS upload storage or disposable hosting, suggesting it's designed as a link farm. The primary purpose appears to be directing users to potentially malicious websites, likely for phishing or malware distribution, aligning with the 'Spearphishing Attachment' technique. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9811

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ketchas.ru/uplcv?utm_term=frozen+2+pel%C3%ADcula+completa+en+facebook PDF link annotation
    • https://hgindustrial.eu/userfiles/files/jorogemuzanojirawe.pdfIn PDF document text
    • http://psychoterapia-przemysl.net/img/userfiles/file/41791782850.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/xisipeje.pdfIn PDF document text
    • http://interel-rus.ru/test/sites/default/files/file/91584267481.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c2bda1cbf43---43827493706.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092890c27d4f---76896819420.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/ketaxowolibugebidab.pdfIn PDF document text
    • http://hyundaidongdo3s.com/images/files/xeniw.pdfIn PDF document text
    • http://optimus.org.au/wp-content/plugins/formcraft/file-upload/server/content/files/16083bbca90537---kagabipamujapumegaz.pdfIn PDF document text
    • http://flyingcarpetclementines.com/userfiles/files/dokosopovadifumex.pdfIn PDF document text
    • http://confidenzacsapagy.hu/upload/73355887857.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160e860bf529b0---dinatom.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/46957600364.pdfIn PDF document text
    • https://grupahatak.pl/admin/_fck_files/file/fasoso.pdfIn PDF document text
    • https://mclandpin.com/calisma2/files/uploads/fatorusoduj.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/p980m0604fhg8p8lbhtfo8kpl6/80545507773.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/f9focn84qfi4ov6p0hpnb46mop/kotuzarazurutedanutag.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/tosaduberetazizenobixa.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f4c9b7c5da---63522043150.pdfIn PDF document text
    • http://jshanwoo.com/ckfinder/userfiles/files/vawizapiritibo.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb63823d900---tivanodevil.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160779f1256528---64490861946.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e937cb53ce9---44529115996.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610d9b21dd351---polulubabizij.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161030218a2f25---94697401695.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10776 2272 bytes
SHA-256: 1f7124750d76e9ca757d1f457c5f1785cb09da087770743863094715d242337e
font_02_sfnt_off000111b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B0 19168 bytes
SHA-256: 1ad00fb5f23b74fbab454fffd0db8d108eb999ca6c5204d9d433ebf8fd8c21f5
font_03_sfnt_off000143af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143AF 10932 bytes
SHA-256: 20676d3233bc5a7e3f125b92f72a0830d61b72f999b7dfd6d78b27a5c49a1805
font_04_sfnt_off00015cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CDB 16360 bytes
SHA-256: e85aea71e2f52809cff0961697f7d7a89b66c9cfd3d07bea68391b7bfccd8b46

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