Malicious PDF — malware analysis report

Static analysis result for SHA-256 0681e6e44f35485b…

MALICIOUS

PDF

79.5 KB Created: 2021-09-16 08:17:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 614d16f92e8da84527e338daaf8f1fd6 SHA-1: 31c566dc87a8e9d9eb7f7c7c081c53c91401d889 SHA-256: 0681e6e44f35485bd25993c1a64b171e76b734e492c8023fd5a4d59fddbeb0db
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many of which point to compromised WordPress upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The presence of a specific lure for 'download among us free for windows 10' further indicates a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly support the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://stiglic.sk/userfiles/file/xumapumetexoxisovapaz.pdf In PDF document text
    • http://exim5.hu/_user/file/jilajoritite.pdfIn PDF document text
    • http://vstarmp.cn/upload/files/20210902_105942.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16142b993b9721---gilitiwofetomifonusasexu.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136f3e71db68---vuromagufolar.pdfIn PDF document text
    • https://intersat.lv/files/file/57231877963.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/fapobekinasubawumafa.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a92802f13---fimobuwigokebulogojo.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/21372116499.pdfIn PDF document text
    • https://autopits-directo.migrupoq.com/ckfinder/userfiles/files/pimidizalub.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///59564222072.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/vuvujajawu.pdfIn PDF document text
    • https://laser123.com/geektic/files/27656768978.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614073a0a0e97---70862340188.pdfIn PDF document text
    • http://cw-cut.com/uploads/file/93823662479.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/fomudos.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/pepimuguvusidapanevej.pdfIn PDF document text
    • https://liepasmuiza.lv/userfiles/library/defivuturip.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/11513518965.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/30348297479.pdfIn PDF document text
    • https://dailyhondaotomientay.com/upload/files/bireju.pdfIn PDF document text
    • https://irepairplus.nl/app/webroot/files/userfiles/files/59880034787.pdfIn PDF document text
    • http://idrogastermoclima.it/Utentifile/FCKPage/file/kewizawozadadofuwuto.pdfIn PDF document text
    • http://langfordfinancialservices.com/userfiles/files/17695792657.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/6ba1d25f2210342cfa4a22465b004323/xomomubanizewuwo.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/1c362d4dbca3eefbc65ff37c7414d7e9/39990553470.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=download+among+us+free+for+windows+10PDF 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_off0000d33f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD33F 10960 bytes
SHA-256: ba3849a6f9100b3eb929fd1dd70b10de465f2522d985c8dfab75a1c8be2eb0ba
font_01_sfnt_off0000ec84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC84 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 16820 bytes
SHA-256: 452449ea4821f61d3caa837b371cd38acf9b67c5c86725c1dc47d1d1fa609c4c

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