Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b840df24eb1b89a…

MALICIOUS

PDF

94.9 KB Created: 2021-08-26 00:33:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c54f3276e823c8dbeb507af6b81a3457 SHA-1: a488b5b565dc5588eec5d80a6b0db36e5f7c1732 SHA-256: 7b840df24eb1b89a103a1c53e4dff0f296e23cf063fd8dff9211766054d5e9d5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. Heuristics indicate it's a phishing trojan, and ClamAV detection confirms its malicious nature. The document body is heavily obfuscated and does not provide clear textual lures, but the overall structure and URL patterns strongly suggest a malicious intent, likely to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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=star+interview+answers+and+questions PDF link annotation
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/h507i1mmpij4cjnubphe0kvp85/38296097974.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/39718408850.pdfIn PDF document text
    • https://www.dolphinrfid.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01e65c6c82---98083178516.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9941b55e7---38226628488.pdfIn PDF document text
    • https://www.perfumista.co.uk/wp-content/plugins/super-forms/uploads/php/files/a04f91f8910a12da289e4a017a2e291f/36550855453.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/82189218220.pdfIn PDF document text
    • https://itchanoi.vn/uploads/news_file/sakozuruwimex.pdfIn PDF document text
    • http://yh-nutri.com/filespath/files/20210820195117.pdfIn PDF document text
    • https://profipreklady.cz/www/ckfinder/userfiles/files/lawom.pdfIn PDF document text
    • http://zwickerfoto.hu/_user/file/vesidiligutuzij.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f4a10152f70---97621124.pdfIn PDF document text
    • https://landbar.com/upload/files/96712295391.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/so2doolnvrn9r8rq6noqdhr8j5/19573174904.pdfIn PDF document text
    • http://xycrusher.com/d/files/rezizuramewasasano.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/74976584694.pdfIn PDF document text
    • http://iacsglobal.iacsinfo.org/content/uploads/files/wojegopid.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/b9354380505558e41140fafe0ea5ded6/ganenareb.pdfIn PDF document text
    • http://sofia-es.tokyo/yamituki-n/uploads/files/54586487657.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/e120402313ebba626a8accdd540ded56/56610805628.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/lavezizesepal.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ca135231c85---rozagepepejinofekasu.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_off00010d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D56 18088 bytes
SHA-256: e49195cd7926879f432bebd35856c5103ba4566878a24de975d3608231a3b2b5
font_01_sfnt_off00013ca3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CA3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000154ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154BA 10668 bytes
SHA-256: 704ae31ef704146a580bf53f3a194457f1f6c764633e702ea2870fa53738706c

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