Malicious PDF — malware analysis report

Static analysis result for SHA-256 4403c3ed3da06a98…

MALICIOUS

PDF

82.7 KB Created: 2021-07-07 09:56:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ebe043480633081fc71bf3dc7089fb08 SHA-1: 1455672376e7a2a6014cc939df908cb11bd25918 SHA-256: 4403c3ed3da06a981d56b5e00c5a0ed2e050e1000d56fe2998416040799676bb
156 Risk Score

Malware Insights

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

The file is a PDF identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to various domains, including those hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://tsradviseurs.nl/mailing/images/photo/file/repinetazisaju.pdf In PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/7ae98fa62fb6a318526bd349025475c7/josugunodokodofamenex.pdfIn PDF document text
    • http://web68s.com/upload/files/54362217508.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/61227189862.pdfIn PDF document text
    • http://ledson.ru/upload_picture/kadebuxiki.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ca191ac5e---67731301888.pdfIn PDF document text
    • http://amghanoi.com/images/ckeditor/files/32280641822.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16076309cb7a5e---falurenalajekateromaf.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8cf27af285---6460521933.pdfIn PDF document text
    • http://saipanbooking.com/FileData/ckfinder/files/20210701_F6B2234C2983964A.pdfIn PDF document text
    • https://tepihtrava.rs//files/6746423054.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6362b890a6---94191843460.pdfIn PDF document text
    • http://aqbnb.com/uploadfile/file/34191647045.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/5eeda5497d3b764096906b8eec736a94/bekulitigirinuj.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/8pah9b8msqshv11hrviahd5406/kiwuxi.pdfIn PDF document text
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/7a04eb718750ab37818c4ba21d68d4f5/57235236865.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/5309586648.pdfIn PDF document text
    • https://masini-de-ambalat.ro/images/userfiles/53355054874.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160a36b2c9008f---mexomutub.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609df8c6b47c4---gawepojoramuxeronewi.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70562553f7---biximamumuzaxejapiwirab.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/68399831803.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/2beeef78ada624aae0cf41d98e8abe2b/56578010196.pdfIn PDF document text
    • http://starrwindow.com/clients/863399/File/neturewal.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=precision+water+resources+engineeringPDF 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_off0000dd49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD49 10544 bytes
SHA-256: 7ceee3f87702280157dbce313064c42a7b97abb2eca0fd4f849f9d3fa3697a5a
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 18224 bytes
SHA-256: 493c93c2e131fda294c6204bb7672230fab9c31941f575b2f61fe0e467e60433
font_02_sfnt_off00012583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12583 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1