Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc473be190be6ae5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-06 05:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ec5f50ec8ab65dace38107dfdddee870 SHA-1: 373a6a00c53ceaf105ae5d8bff970c4e68ade315 SHA-256: dc473be190be6ae53a5d9d69fdfedb61add15580f666a4df7948f4bacb663bbc
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users. The presence of external URI heuristics and the nature of the links indicate an attempt to lead the user to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://askort.pl/Upload/file/97426764379.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/517e4e20bba18f165fa7273cfbac3a6d/83592232122.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/9a5218b62250ba2eddbbb6928b241e9d/vexolaramijijedugobiro.pdfIn PDF document text
    • http://erbilsunhotel.com/wp-content/plugins/super-forms/uploads/php/files/g3c3ebgsfq18nubt7rdcphve80/23287918192.pdfIn PDF document text
    • http://imdad-egypt.com/userfiles/file/42014938087.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607feb2cc6ca9---zafogasorifugetake.pdfIn PDF document text
    • https://network-italia.com/file/87869279031.pdfIn PDF document text
    • https://die-elke.de/cms/elke_page_files/file/nokojido.pdfIn PDF document text
    • http://inse.us/uploads/images//files/matugude.pdfIn PDF document text
    • http://skupka54.ru/upload/m/gipav.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16114d5678e964---65612825241.pdfIn PDF document text
    • https://asiatravel.kg/wp-content/plugins/super-forms/uploads/php/files/fe4d509bc12fe3b0c2eae0a018320007/xagozuwajazowukuj.pdfIn PDF document text
    • http://sl-light.ru/design/img/upload/file/zelofi.pdfIn PDF document text
    • http://timebymtm.com/upload/files/79140098665.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/172decae455b479579f0bf984492cec6/towazebonesaxisukur.pdfIn PDF document text
    • http://www.bash.cl/media/file/losefujadaravukoru.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080271e9fc24---pazupesojulumodazomaku.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/75528547983.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/83368455653.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/tawuk.pdfIn PDF document text
    • https://agermag.ro/mm/file/lazugatijukolidojil.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=chief+communications+officer+job+description+pdfPDF 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_off0000dfdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F1 17628 bytes
SHA-256: 66c200a8456cf0a623dfc0c51363b5af3ba2255e005912182cbd3c8543a9bf83
font_02_sfnt_off00012577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12577 11240 bytes
SHA-256: 679bbab774898c8e8e76b2ba7b7f06f6ce20c63b4f55afadc93695976141a300

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