Malicious PDF — malware analysis report

Static analysis result for SHA-256 c13da9519fb45545…

MALICIOUS

PDF

85.7 KB Created: 2021-09-09 08:19:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7cc3875278db7522d0c6970e61b8a3d5 SHA-1: 5623117790f99c7b8c0addeeb46bc4eccce2cb76 SHA-256: c13da9519fb4554561d2a602835127b5cc58964384f2afd2b4b89a82db64b7bd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. It contains numerous links pointing to various domains, many of which are hosted on compromised or disposable infrastructure, suggesting a link farm designed to redirect users to malicious content. No scripts were extracted, but the structure and URL patterns are consistent with phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://emailreceptionist.net/userfiles/file/66245461094.pdf In PDF document text
    • http://saopauloairporttransfers.com/ckfinder/userfiles/files/xuxapejufibifa.pdfIn PDF document text
    • https://adci.vn/data/upload/file/kigoposobixok.pdfIn PDF document text
    • http://yanarfabrics.com/firma/files/zuwumilemosojunama.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/34769177825.pdfIn PDF document text
    • http://s13cf5ef.alojamientovirtual.com/ropadefutbolbarata/userfiles/file/retuj.pdfIn PDF document text
    • http://cuacuonnhanh.vn/Images_upload/files/dijalapuzutakizoraxojoza.pdfIn PDF document text
    • http://futboltotal.net/images/files/bosorowivolakod.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/7b1bc5513a352bf8e396049285173fa6/92191667529.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/19818209318.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/35723031822.pdfIn PDF document text
    • https://alicantea.centralcms.cloud/galeria/files/pepofifajogiduz.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1612ffaf8d2ad7---dexipigutudilobemebu.pdfIn PDF document text
    • http://railwaysrailroads.com/upload_files/files/35064596289.pdfIn PDF document text
    • http://berbun.com/user_img/file/89957637207.pdfIn PDF document text
    • http://clerus.hu/files/file/26216379609.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/0b8eb694babbe738ba6de3abf2ab2fdc/liporusona.pdfIn PDF document text
    • http://esllearningbydesign.com/app/webroot/files/file/66363247477.pdfIn PDF document text
    • https://smartech.lv/sites/smartech/uploads/documents/files/59688829873.pdfIn PDF document text
    • https://mediaskills.rs/files/1273865664.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/55302790989.pdfIn PDF document text
    • http://eraldocomo.it/userfiles/files/9358815598.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/safapaxisov.pdfIn PDF document text
    • http://klick-tipp.info/ckfinder/userfiles/publics/files/mozumewatajabose.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/zozonepep.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=new+movies+download+tamil+2021PDF 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_off0000eaec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAEC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10303 10732 bytes
SHA-256: ddd93ababebcc412f2a32f93882dcbf495025f2c47cc179d42578e5f0d721dd4
font_02_sfnt_off00011bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD6 17568 bytes
SHA-256: 4ec1f1e6f2ccc0879d90e96a5d77bb24d2e6dd8525520d86ebf186559d4760ed

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