Malicious PDF — malware analysis report

Static analysis result for SHA-256 deb9a759488b5908…

MALICIOUS

PDF

86.1 KB Created: 2021-09-15 09:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d58bc441786dcf921eed643e4e87a60f SHA-1: 1ee8e5a15ba0018ae751dbf2c88d8aa5b6d8b305 SHA-256: deb9a759488b5908c4f10b879ff6481b08fde425254ca9037dc188150e13ea12
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript, which is often used to exploit PDF reader vulnerabilities or redirect users. The sample also functions as a link farm, pointing to numerous URLs hosted on potentially compromised websites, suggesting an attempt to distribute further malicious content or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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://garglob.ru/uplcv?utm_term=best+make+up+games+for+android PDF link annotation
    • http://etyekilovarda.hu/userfiles/file/pisijupe.pdfIn PDF document text
    • https://kheops-so.fr/ckfinder/userfiles/files/rifatobitibelo.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/25002063354.pdfIn PDF document text
    • https://ihotel2b.com/upfiles/editor/files/duvemisalo.pdfIn PDF document text
    • https://laundrybyconrads.com/nbloom/fckuploads/file/supanajijuzexadif.pdfIn PDF document text
    • https://cultureresortpokhara.com/assets/userfiles/files/76211118801.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/jowisotojuvimam.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/5f7b6246e55e0d75c67d45fbf42978da/24392021445.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/h1jl8v6l85iggqgvdfu0qhidfl/fijudafoxukuma.pdfIn PDF document text
    • https://inprovitcolombia.com/ckfinder/userfiles/files/69939959241.pdfIn PDF document text
    • http://www.stsmcc.org/www/js/ckfinder/userfiles/files/fisunulexizepegol.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb4657b36---35629323042.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/15140904333.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/40746bd5ca9288ae3f7d5c3d9731ed4f/6108666614.pdfIn PDF document text
    • https://linker.tw/files/zofuvikegulevoruzubalemov.pdfIn PDF document text
    • https://eghamatkade.com/basefile/eghamatkadecom/files/43380738629.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210913_EFA39A4CB23E45F1.pdfIn PDF document text
    • https://paulogomeslda.com/userfiles/file/liteposapup.pdfIn PDF document text
    • https://sindhuinvestment.com/ckfinder/userfiles/files/40563984370.pdfIn PDF document text
    • http://rrarental.org/upload/file/pazofodaxidatudewugifat.pdfIn PDF document text
    • http://mtcnx.com/upload/fckimagesfile/62276984400.pdfIn PDF document text
    • http://flygarfield.net/userfiles/file/gopurig.pdfIn PDF document text
    • http://sushigonewildtogo.com/uploads/files/kovigixuvake.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/79990451782.pdfIn PDF document text
    • http://zs-g.jp/app/webroot/js/ckfinder/userfiles/files/monafunup.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/e2c6b0f267488557d5df7e563b6aba90/96119741877.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_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 17664 bytes
SHA-256: c4747db1171f188b6d9ed6d198b177f488c238fd6aa1fc8c335ac992b1e8447d
font_01_sfnt_off00011929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11929 11040 bytes
SHA-256: 9f63271cbc4b8cafe4c6f4875cce3b5ee7a5068f6cadd70c7d8ca676bfb574ab
font_02_sfnt_off000132aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132AA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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