Malicious PDF — malware analysis report

Static analysis result for SHA-256 504f8491d7fe6c86…

MALICIOUS

PDF

96.1 KB Created: 2021-08-11 09:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: af988bf112f64d62f26b1f5ce0360667 SHA-1: bdfb5050c5153df028efc9687d9c4f2f2cce2f9e SHA-256: 504f8491d7fe6c86eaecac6a02a6600ac75fd4f3759ae5a0afcab78ea8756484
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. The heuristic 'SE_FAKE_CAPTCHA' indicates the document likely presents a fake verification prompt to deceive users into clicking malicious links. Several URLs hosted on compromised WordPress sites and disposable domains were extracted, suggesting a link farm designed to redirect users to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fe60d6d465---39152015573.pdf In PDF document text
    • http://beloit1962.com/clients/8/83/8368a4f838dea3176655029ae9e337da/File/xewaziwelakirirozowubeko.pdfIn PDF document text
    • http://growlink.biz/userfiles/file/xirena.pdfIn PDF document text
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aeecd6c187a---80258147708.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/759bc26de657adc8af99a87838dd176e/sexugipalidenujakevufami.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a51a0e1526d---60939502965.pdfIn PDF document text
    • http://homestationrealty.com/userfiles/files/93362180782.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/limemo.pdfIn PDF document text
    • http://hamandeggsclub.com/clients/e/ee/ee862789ee8b59d3f3d22261ccc35c80/File/wusomegupotagalixoviwur.pdfIn PDF document text
    • https://balaji-technology.com/userfiles/file/96307327902.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/gujekojipetotezojufetazid.pdfIn PDF document text
    • http://optikametuje.cz/userfiles/file/6290094295.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/40487092482.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7df581a76---25262194605.pdfIn PDF document text
    • https://troypin.com/calisma2/files/uploads/jadososakemufijokonap.pdfIn PDF document text
    • https://www.businesswatchguardingservices.co.uk/wp-content/plugins/super-forms/uploads/php/files/p0ad6gqhu378u4g1q3k5mlafph/95365709030.pdfIn PDF document text
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/7f62c6500833484fb8a32733208d8fed/tewofuko.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/suxigutawimolesizawejerub.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0a7a0356b1---78188522002.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609feae065776---6214707387.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/38295207207.pdfIn PDF document text
    • https://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdce87b85f---karakumolizepujegobowos.pdfIn PDF document text
    • https://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/ece675d5fedf2659883cb3fd4e7c7323/suponotosedibivan.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f759dbf6366e4711861623dde00aa6be/wimawizagesugazisuxira.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=us+certificate+of+origin+pdf+formatPDF 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_off000114fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FB 16588 bytes
SHA-256: 05de7802fe921834de306b3373dd7b9f91c3e935ff86b371af26d0f9435a8c95
font_01_sfnt_off00014013.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14013 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001582a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1582A 10924 bytes
SHA-256: 8b414c9ae0b97eac28409d935468d4dc08f006766f8112a09652dd158fea6462

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