Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc6bee1c5eb257ab…

MALICIOUS

PDF

88.3 KB Created: 2021-07-08 01:25:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: be0091017a2eb6e6d59be60621543931 SHA-1: 1d9ba57421ee0614d4464f7c65d3da25e3f749eb SHA-256: dc6bee1c5eb257ab19d8530b40fc875040301bd13afac00f9680bb8bf2ffe6ee
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be directing users to potentially malicious content hosted on these external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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 https://ketchas.ru/uplcv?utm_term=cooking+with+cornstarch PDF link annotation
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d142c0d0---bojetipevirimizavofizapoj.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/qels3poi3kis1u60eqsdph0s37/91040168195.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/e5dc7e4f70ee514af6b53de6839079b1/82402382341.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b7561faa603---39333817501.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/xibev.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160cfbc23cbe5a---duxudagunopiberugug.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/vqhj95onaupmkk2nbhpl9k30qm/lubexedar.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/78555868192.pdfIn PDF document text
    • http://uforoi.com/app/webroot/uploads/files/96920534627.pdfIn PDF document text
    • https://goodluckfishing.com/ckfinder/userfiles/files/66748353037.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8e60a5ef77---beropebojix.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/sagalogevegibafuzusadu.pdfIn PDF document text
    • http://steelbo.com/uploads/admins/u0/files/20210530054439.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a30d849f---turiraxon.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/r8a48mg2233pu3q5df67ctclf0/90543418486.pdfIn PDF document text
    • http://domholidays.com/userfiles/file/20209716649.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1608a81508ec64---99195807793.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/lutal.pdfIn PDF document text
    • https://hgb.se/filer/file/mavenujudatime.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a994fedfa39---topon.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/makimivigomo.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/qvcv4fdjl9vuho56a3o4i0fsv4/gupikagobivepape.pdfIn PDF document text
    • http://clingac.com/d/files/julakanekolijarola.pdfIn PDF document text
    • http://chupanhnoithat.vn/upload/files/satozovabokubataxawovopi.pdfIn PDF document text
    • http://traiteur-ribot.fr/userfiles/file/60924070058.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4cb9de9e9c---62022928898.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_off0000f716.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF716 17132 bytes
SHA-256: 7feda25cb127addaa5f8ff99d14898952e6e5b1356babed357ddb24e62bf38a5
font_01_sfnt_off000123df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BF6 10540 bytes
SHA-256: f8224e87c3df1cd53eeab8705c1b1d660f907a24f5cfafcca8f1e941c75f11dd

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