Malicious PDF — malware analysis report

Static analysis result for SHA-256 4591d7a20ce662de…

MALICIOUS

PDF

95.6 KB Created: 2021-08-17 18:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d7cd0e134a9f153fe2961967af0637a4 SHA-1: 5642f0a06d6fc2b9cb47d6f57110020fecaa2776 SHA-256: 4591d7a20ce662de4480368621808176dd5428a8e79035efc90c1e0b5e4e7b60
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 trojan payload. It functions as a link farm, with numerous embedded URLs pointing to external resources, some of which are hosted on compromised CMS upload storage. The primary purpose appears to be redirecting users to malicious content hosted on these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bc0ed7f1ff7---18607855422.pdf In PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f512886f12---belurajudijugawetefu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099ef8c5b363---dotupujebixudeporukoxoz.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/radimixi.pdfIn PDF document text
    • https://cosanuesa.com/componentes/editor/ckfinder/userfiles/files/79672665615.pdfIn PDF document text
    • http://sibinetweek.ru/userfiles/file/77974015688.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cad343ebb5e---regupizoterizosimilowas.pdfIn PDF document text
    • http://phdpecs.hu/userfiles/files/7204717773.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/vafosaletutevupesugoba.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/xavuroluxigitibaz.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/088046f8444190bf62dfb98492a5949b/bagepilu.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/vokabugupilurefeki.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611859628be47---36998884864.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abe284a1bb5---36262064488.pdfIn PDF document text
    • http://yorktownhs1987.com/clients/57482/File/15099544874.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/10108884892.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16078feffa5909---tekivogaxe.pdfIn PDF document text
    • http://sro52.ru/uploads/files/14889934377.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/6135e463daa6c19a36c5387d6c222e80/vagodajelejavuleluwer.pdfIn PDF document text
    • https://manualismedicina.hu/fileok/file/werimixe.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/qungkp2pdkospiujjn63drlf25/41312146331.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=bien+dit+french+1+workbook+answers+cahier+d%27activitesPDF 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_off00010e69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E69 11048 bytes
SHA-256: 8c62549d7f96b1754cb8922b1cc92ffac4d0cd2ce223682c829d79f267df4177
font_01_sfnt_off0001283e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283E 18668 bytes
SHA-256: c01e1eda2c8ad2a9282426af908402a10792de8e44575bca0b7b938dfc1da9b2
font_02_sfnt_off00015846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15846 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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