Malicious PDF — malware analysis report

Static analysis result for SHA-256 8441cf3ab89d822f…

MALICIOUS

PDF

69.5 KB Created: 2021-06-24 16:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 446813406a3576c68afcf94e1456d7c1 SHA-1: 8bc7ddf071b54df3e2eaefb67aed2ca81a591ed5 SHA-256: 8441cf3ab89d822f16bd2011665bb734e1ee2a338dd7d09560adb548c5e62bf5
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm. It contains numerous URLs pointing to compromised WordPress sites and other domains, some of which host further PDF files. The presence of multiple distinct hosts and the use of 'utm_term' parameters suggest an attempt to lure users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://tomorrowhubs.com/upload/users/files/jukurox.pdf In PDF document text
    • http://vmkmsz.hu/userfiles/file/dezunexekipugebojomukos.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d9c50555ef---xojosusogokego.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/64ee13a4431d26b95f678d94f339b6b2/lisutotudebod.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609f1e70dfeeb---78907185351.pdfIn PDF document text
    • http://www.microsinusectomi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a565d9f37b---86520913207.pdfIn PDF document text
    • http://dgjst.com/upfile/file/39563086055.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160ad0715e86c3---wamamiwigeva.pdfIn PDF document text
    • https://kisikana.hr/userfiles/file/62475894327.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/obqdgn97tmtk62859nct1qtp02/botazotixax.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609cf2842a4fe---liwiromazekitugatapinug.pdfIn PDF document text
    • https://www.truegridpaver.com/wp-content/plugins/super-forms/uploads/php/files/ebe60da8c4b448c6d6921d43471d35ae/jiramelovonovav.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/d801fcabe22cf88cbd4ac85debeb72c8/8552506624.pdfIn PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1608694a7b9591---levetaxerodum.pdfIn PDF document text
    • http://dekoblickfang.de/userfiles/file/jejekilorepiwuxunofobako.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/nelotanezidinisisopilem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=just+shut+up+and+do+it+brian+tracyPDF link annotation
    • http://e1pl2.nazwa.pl/busy/fotki/file/xexomumiwusupilurazar.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC776 5360 bytes
SHA-256: a415385892ed244d5cde95cbc31ea090c850ceab6ce1e61c9a43dca698d49e64
font_01_sfnt_off0000d9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9A4 21288 bytes
SHA-256: 195a100f77e5516e82e01527d74dd3e2bf9e33c167f7f8870dd87595cc2c3ede