Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c294cf4a6642d5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-18 05:31:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 868acb5557db15bc4c8316207568f1f6 SHA-1: 9035d2c69681112a01c0bd0e965a8377a7ca156b SHA-256: d4c294cf4a6642d58ec92ceea10cb481a0fbe87daf1140c625ab8ddb37cebb32
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body was unreadable, but the presence of multiple external URIs and link farm indicators strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://infrive.ru/uplcv?utm_term=bundle+in+android+tutorial PDF link annotation
    • http://seattlebestteriyaki.com/uploads/files/wogos.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/kokediguxifesalerotiwulil.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161318d568700e---sowiwavojujisujisukewowur.pdfIn PDF document text
    • https://tinnituskozpont.hu/files/naxuropozaki.pdfIn PDF document text
    • http://kulturazebrak.cz/userfiles/2614126393.pdfIn PDF document text
    • https://webkapper.nl/ckfinder/userfiles/files/wegowiravewen.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/47804641315.pdfIn PDF document text
    • https://milliondollardesiclub.com/upload_files/featured/files/86219019081.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/fusarogofuvu.pdfIn PDF document text
    • http://miskolciharsona.hu/pictures/file/93271993511.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/55961589650.pdfIn PDF document text
    • http://cokhihoaiduc.com/uploads/files/kofezotisebifekujuxuj.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/22910505877.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210903143230714836.pdfIn PDF document text
    • http://hoigolfbinhthuan.com/users/files/pukoxasezivizo.pdfIn PDF document text
    • http://www.louthadventures.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1613fedecced89---79755197045.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/lebakufup.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/f10e496e2e2dc8e7552c09cb927d9ad9/37662647534.pdfIn PDF document text
    • https://happy-playground.gr/uploads/_uploads/files/20617742286.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/pagirufibobubaxolimuvo.pdfIn PDF document text
    • https://ourcampuswindow.com/ckfinder/userfiles/files/33265104119.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/59164163368.pdfIn PDF document text
    • http://intranet.uts.edu.co/portal/app/ckfinder/userfiles/files/nipesasuded.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_off0000c232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC232 10224 bytes
SHA-256: d3520d4ca22472e8dfbb45188b5720d9815490020d73f883e58c74beaf751dbe
font_01_sfnt_off0000d935.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD935 19568 bytes
SHA-256: 1d682048a5ef00a0c45a61c7f6660f45ca1edb8dc1fd85d3349d88fa30dcf651
font_02_sfnt_off00010cd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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