Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb6420a27bcb9e35…

MALICIOUS

PDF

86.7 KB Created: 2021-09-03 09:20:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 98234907fd8e66490442a153cfef5c11 SHA-1: 1ed66caaa1fd90d1f703abf4ead4cdd36e64820d SHA-256: bb6420a27bcb9e355b491e3da88bd05c00332b3d9c5105b771c46c4b75a3f413
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary attack pattern involves leveraging these external links to deliver a secondary payload or conduct phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://chcial.ru/uplcv?utm_term=comentario+de+texto+narrativo+resuelto+pdf PDF link annotation
    • http://mimarkamilozkartal.com/userfiles/files/gisebezije.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/rozejokivamizivum.pdfIn PDF document text
    • http://kesifveotesi.com/files/pekapoboxupofiget.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1180c52ad94dcfa358c272e10fffbde5/dosesidox.pdfIn PDF document text
    • http://prodottoitalia.eu/userfiles/files/binusizujosufafalevemuvi.pdfIn PDF document text
    • https://3dreamstudios.com/wp-content/plugins/super-forms/uploads/php/files/2175179a716b738fae594f07315b7893/91623673277.pdfIn PDF document text
    • https://tmtteks.com/files/vulegomitikemixebamuwod.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b9b7f861331---71673414519.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079aa6e2020e---wuvekunedusama.pdfIn PDF document text
    • http://arredamenticucinesiciliane.it/userfiles/files/85541521488.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/podinigusofivowanitol.pdfIn PDF document text
    • https://szallas-karpatalja.com/upload/gokuxivemubusojugad.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/kakotozav.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/fea6fbc518375dacb1b2bfca02853a97/84711356455.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kilubevifafunipokux.pdfIn PDF document text
    • https://swiz.eu/files/editor/tuwof.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/rizawezuguketis.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160aecf677c7e1---kilirudajusopanet.pdfIn PDF document text
    • http://wineuniverse.us/userfiles/file/77737054974.pdfIn PDF document text
    • http://aldara-latinoamerica.com/userfiles/file/39278316533.pdfIn PDF document text
    • http://artgraf24.pl/userfiles/file/65423545732.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c19bf92deba---81093320372.pdfIn PDF document text
    • https://purefeeling8.com/data/file/buwolobofeveleliloku.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_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B6 10956 bytes
SHA-256: 3dc53c072fb562ed01d39db68ac98b802c95c72392bd3d6937d30ed9d5508a96
font_02_sfnt_off00011b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2A 19540 bytes
SHA-256: cfd40d694a4832027756fcd4cfc7b750d90f6a53c6024a2362dbdb2cb47167e3

Open this report in the interactive analyzer, or submit your own file for analysis.