Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b781626e229d3c…

MALICIOUS

PDF

70.7 KB Created: 2021-09-27 08:12:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8e769b82011daf661d7ae6a4136fb1f8 SHA-1: 3e9c49710c08a696fa24e3ae0e9af8e8f6263236 SHA-256: d7b781626e229d3c20108c7ecddba4117ebe64b6fbddcaa9324a09b1dd1e9720
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous URLs pointing to various domains, some of which are hosted on compromised WordPress sites or disposable hosting. These links are likely used to redirect users to phishing pages or download further malicious content.

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 https://medvor.ru/uplcv?utm_term=tizen+store+apps PDF link annotation
    • https://coop-alternatives.fr/images/images/depegilokojurido.pdfIn PDF document text
    • http://mfahk.com/upload/files/duzilewop.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/92522553241.pdfIn PDF document text
    • http://ccsilver.kr/files/fckeditor/file/142228709161467ce65edd5.pdfIn PDF document text
    • https://mygenius.ru/admin/ckfinder/userfiles/files/65966426820.pdfIn PDF document text
    • http://soundspace.eu/Upload/file/7526185719.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614e73d6555e4---5999021145.pdfIn PDF document text
    • https://0800-707-808.com/upload/ckfinder_temp/files/20210925131654.pdfIn PDF document text
    • http://msmzizkov.cz/data/dokumenty/54274166293.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16140251f9bd28---laperuxakakulaxofivijaxe.pdfIn PDF document text
    • http://quiltingacademy.com/fckeditor/userfiles/file/92557754998.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/835471664.pdfIn PDF document text
    • http://ohxto.com/uploaded_files/userfiles/files/vivazugofov.pdfIn PDF document text
    • http://caycanh.vn/images/fck/file/14412941486.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/pebedasirixapagevu.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/1bc0a4664f35cf46531af82fb64cb7c9/78180933256.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/24603062559.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/71205386813.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/caf8eb8770a0be16645203f266279c9d/87769087019.pdfIn PDF document text
    • http://ownlines.com/upfiles/file/33947526591.pdfIn PDF document text
    • https://sma-dfgg.org/site/admin/file/20293727755.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4c0bbd261---37176767568.pdfIn PDF document text
    • https://berettyobne.hu/userfiles/file/41594424924.pdfIn PDF document text
    • http://ranch.pl/files/file/jobaseburagutudo.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16143124a9d31f---7062795697.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_off0000b3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3D6 16496 bytes
SHA-256: c7497c5e8764ec01d06d53f25eee26b49c2037296766c7ecacff4f4b3bae0d43
font_01_sfnt_off0000de41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF658 10220 bytes
SHA-256: a7f93c78a9c6254eb862f48c396f64e9e306850cbff7c3e01a9e2ef220d42a15