Malicious PDF — malware analysis report

Static analysis result for SHA-256 d77077be51841547…

MALICIOUS

PDF

81.9 KB Created: 2021-09-07 06:59:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 9eab541346473db3d0866e16cf78badf SHA-1: f0d0070fb74f082e8187b4279bfba7264dba3349 SHA-256: d77077be51841547e0b173a9570a41883413c5b0e07d51d4abb76a46ff492692
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, suggesting it's part of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites or download further payloads. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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=mazda+3+2007+workshop+manual+pdf PDF link annotation
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e3c609d34---xomoxafune.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/9eb8e80c7c51a6d8244ed700aa626a1a/48577560651.pdfIn PDF document text
    • http://cosonhuath.com/hinhanh_fckeditor/file/89530518297.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/ab2fdd9094e028cdd7508d755fef40d2/kewuratugevidi.pdfIn PDF document text
    • http://mauchlineware.com/html/chapelstreet/web/userfiles/files/59044086449.pdfIn PDF document text
    • http://kcobafl.org/ckfinder/userfiles/files/zanudef.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/161237c48b6ae2---vumosiwi.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/160abf741577bc---73051009014.pdfIn PDF document text
    • https://citytrafik.nu/images/file/tatubugaxirapasexipabuzaf.pdfIn PDF document text
    • http://dainichiji.com/upload_ckr/files/68180268117.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/sd3tk45108m88bsp0ml5ce12r7/kugutisawukabe.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/fifemi.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/c96n2b8lg30bljhka0uerrv0qt/94508962123.pdfIn PDF document text
    • http://hurtglass.pl/upload/file/senamomofigadefu.pdfIn PDF document text
    • http://ourgans.org/userfiles/files/83069447281.pdfIn PDF document text
    • https://motoquadro.de/userfiles/file/rorevupazogirezukemareno.pdfIn PDF document text
    • https://digireg.se/upload/83173276045.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/xamedazunisurazu.pdfIn PDF document text
    • http://ilovehikari.com/uploads/files/21886188931.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/a3en605r9s4mcipae37jqcttla/koganalidifebomaj.pdfIn PDF document text
    • https://hotnews.md/upload/userfiles/files/66532894732.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_off0000d9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 11236 bytes
SHA-256: fc8e936a870a3f5135f91548d3c1df60d0e5ca8921367fc7a9f49b55816d2e54
font_01_sfnt_off0000f453.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF453 17476 bytes
SHA-256: 107e4180289e5bd53739f5cee837f6ea0580df4026f0556c57cd06fcafe35c21
font_02_sfnt_off000121b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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