Malicious PDF — malware analysis report

Static analysis result for SHA-256 983c391a3a0063ee…

MALICIOUS

PDF

93.6 KB Created: 2021-09-10 17:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 9dfea213f82349b11c216eff63216b6d SHA-1: ac09b5c8cd9e43bb4d945fe5e82ed64a664c059d SHA-256: 983c391a3a0063ee115783ddbd24d4e96b2f670c0f8315b60c740538a0a2c46c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains numerous links pointing to compromised websites, many of which host other PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these linked documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/bbb04ab534b18c5e8f81fafdd5f0aa0f/rupulevotujobexijefiwup.pdf In PDF document text
    • http://hotelpenza58.ru/ckfinder/userfiles/files/22179390991.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/38016370322.pdfIn PDF document text
    • https://network-italia.it/file/96171774078.pdfIn PDF document text
    • http://medicaldistri.com/ckfinder_files/files/kotadakumobomuseni.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/11908701326.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/6bde95ff791b24e16f56d2ed30d94eba/posefuxiketisotemobevala.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a3a77f1c9---92138736879.pdfIn PDF document text
    • http://www.madiran-cruduparadis.fr/ckfinder/userfiles/files/wibomo.pdfIn PDF document text
    • http://bagumul.com/file_upload/spaw_upload/file/20210908131918.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/xogafitivoxipizitinopewor.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/tizejimugalelinosux.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b63b88d41---19845631465.pdfIn PDF document text
    • http://schokozentrale.de/idata/80332972159.pdfIn PDF document text
    • http://akgwealthplanner.com/crm/files/17756636246.pdfIn PDF document text
    • http://architettotoma.it/userfiles/files/41378824027.pdfIn PDF document text
    • https://www.ayersworthglen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138a6129ae32---zusawekek.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/luvopib.pdfIn PDF document text
    • https://dm288.com/slicice/file/mukezawezabipirukaxigev.pdfIn PDF document text
    • http://blessingsngo.in/userfiles/files/lasizamizolefofudefuz.pdfIn PDF document text
    • http://daoltrading.com/userData/board/file/62352995313.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/gepejakoba.pdfIn PDF document text
    • http://mp-journal.com/media/file/1266708388.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/17720946600.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=7+elements+of+art+texturePDF 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_off000107c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011fd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD2 18920 bytes
SHA-256: f6b5a762f1f1e83e32f412c8787aff7b7b06eece8fa00d5bbbd7e4b4cc7d42b5
font_02_sfnt_off000150d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150D2 10436 bytes
SHA-256: e37b71b58aa12a50c12d2f7537ea9418602291f7ed591d205890ef1b06e81968

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