Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c7fdcce97917eb9…

MALICIOUS

PDF

92.3 KB Created: 2021-09-03 21:06:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8a0c6a781e7b7ab8fb32a69eba572bd7 SHA-1: 8261e0d87794edaf9916968b7687a1ea282459ca SHA-256: 4c7fdcce97917eb93e6e2a26b4664f7e50b92cb572f617fba2aef96ee453cf07
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised CMS uploads or are hosted on disposable domains, suggesting a link farm designed for phishing or malware distribution. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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=adding+fractions+with+unlike+denominators+word+problems+worksheet PDF link annotation
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ff6e5c0663f---62202570798.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/73512976083.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160e2ff4669ea4---8396871040.pdfIn PDF document text
    • http://rotarylaspalmas.org/documentos/file/timovamavejugidevaj.pdfIn PDF document text
    • http://www.adarshvidhyasankul.org/userfilesfile/rurulaverukokazige.pdfIn PDF document text
    • http://thesciencenetwork.org/uploads/files/65712006571.pdfIn PDF document text
    • http://omni-links.com/images/blog//file/liduwumof.pdfIn PDF document text
    • http://nuestratierrapremios.com/campannas/file/marafetabigitegej.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/ff05da94170141d22e9a0b74f5caa7d4/fivurubud.pdfIn PDF document text
    • http://shepardfarm.com/clients/877021/File/zadopadibo.pdfIn PDF document text
    • https://niboparis.com/upload/fckeditor/files/donikimaz.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/lde64bl7qgjlskkdu6i8usaml0/sumiwupefega.pdfIn PDF document text
    • http://hebammenglueck.de/ckfinder/userfiles/files/57582436023.pdfIn PDF document text
    • http://martom24.pl/martom/userfiles/file/45465807300.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160701c69dcb43---78642356191.pdfIn PDF document text
    • http://nawaress.com/webroot/js/ckfinder/userfiles/files/95619901488.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/nusuwawo.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fajagazupupupobe.pdfIn PDF document text
    • https://loyd.rs/images/file/juxevix.pdfIn PDF document text
    • https://espritgt.com/userfiles/file/22184409232.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/topatajojokevusuwani.pdfIn PDF document text
    • http://mousike.it/img_ins/files/1777162960.pdfIn PDF document text
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/bf57680fb92b82e297d51bcbf4464aff/bokorexodedirodu.pdfIn PDF document text
    • http://centralcogtc.com/uploads/file/masikebofujokipesu.pdfIn PDF document text
    • http://maximaviajes.com/FCKfiles/file/domofow.pdfIn PDF document text
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/6000a6f74e75419b0f0e6e80eb5f2130/38410479945.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_off0000fe85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE85 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001169c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169C 11464 bytes
SHA-256: 16a3ba0dbae40e6d959e865cb4203b7eb765a26ffffd5528745564106b14c6e3
font_02_sfnt_off0001312b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1312B 19268 bytes
SHA-256: 899dc8bd3fe6bc9985a511a9250e1ccb2cc61faf9417d07a3fe268ef27228d41

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