Malicious PDF — malware analysis report

Static analysis result for SHA-256 803b0d5ec03dd4c6…

MALICIOUS

PDF

105.9 KB Created: 2021-07-16 01:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1721c6345dcddc2273336f35b5eebb5b SHA-1: 429b01cd2227c28537c759ddcdd1fad0d5574333 SHA-256: 803b0d5ec03dd4c63e8a299732782fadb6cbfecbb9c572dc87aae39054bfdf35
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is unreadable, but the heuristics strongly indicate a malicious intent to host or link to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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 http://dolphinkorea.com/files/files/bikubulibi.pdf In PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5854677cf113475742dede6c08cd0b63/64701598661.pdfIn PDF document text
    • http://montgomery71.com/clients/34132/File/zigibezojumitule.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/36785079311.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/2583d1d15ffa6455ea4d10546c7ab80b/12982636654.pdfIn PDF document text
    • https://lasvegasrebath.com/wp-content/plugins/super-forms/uploads/php/files/f05bac642591c1ea7c88b97a2351a854/93484301856.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/mtmnshc2oiq70smp6al0ostr4g/xesesizupoz.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/28367831528.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d5cdf2108---rimalav.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/dc48cd711c0e0ddbc3b5b18fb230531e/danezonuxejoz.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/a0a3c065d075837081ab97ce1889dba1/31333239618.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/46179598655.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f0596ace8---61088869462.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/7lgc46to60bfj3p7ovcqfma22n/pisebuxo.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/0465b8ef9b04885b4ba7448d7e93a603/7883756286.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/51765176841.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/d801b5ab27e3533306410f985157e107/sotepowogimuluf.pdfIn PDF document text
    • https://carlojans.com/cms/file/potime.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16085107a23829---vuwifejogofetumuwi.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/632e3f8e694beb36e5d732b779cbae33/9395870020.pdfIn PDF document text
    • http://sebatmakina.com/files/56336576204.pdfIn PDF document text
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/k21hvhdpah05ms4c0s5qrc7cec/87296111522.pdfIn PDF document text
    • http://geose.ru/userfiles/file/badajonemozatowepuxozeme.pdfIn PDF document text
    • https://cedarcreeksauce.com/wp-content/plugins/super-forms/uploads/php/files/45dcfc3f8be7fd422830fb7dd36e89bd/wubonulugaromovagugiru.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=pte+score+chart+with+bandPDF link annotation
    • 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_off00013b23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B23 17700 bytes
SHA-256: aaf695aea9930dd72c96e6f4e9e54aca3b8c983eee2d8c8efbd526db63db5d0f
font_01_sfnt_off000169ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169EA 10648 bytes
SHA-256: bed08bf38325031e2135dd5d13d98c5023130d25aa87d7b24e6b6f48effb43d2
font_02_sfnt_off00018256.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18256 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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