Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3b2aa8c4a32b12f…

MALICIOUS

PDF

69.3 KB Created: 2021-10-03 14:46:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 090948441ca88801134f2c407308e448 SHA-1: d2696fde85114ca4e80278af75526033e4b7df5e SHA-256: d3b2aa8c4a32b12fa59e4c7d129edb132f4f9f388c2b780e77ebd19e60ff8411
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites, likely for phishing or malware distribution. The presence of embedded URLs and the nature of the heuristics suggest it is designed to exploit users by redirecting them to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crysiq.ru/uplcv?utm_term=text+and+tests+6+answers PDF link annotation
    • http://www.sas.edu.mn/ckfinder/userfiles/files/vuwijufele.pdfIn PDF document text
    • http://dietaltop.com/userfiles/files/40530949339.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614e804576502---janorokizuzurutavubimoma.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/rigowirapexuje.pdfIn PDF document text
    • http://xuanfe.com/uploads/FCKeditor/file/sewoluxed.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/a0f5556757a85b60e72185e9256bcb4d/kazofajinesufada.pdfIn PDF document text
    • http://rspon.pl/images/wyswig_images/file/36589028666.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/lusibetalimuro.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/cnl3ic8j2gcnv19edcjgpk2g0f/giselafifudifekijot.pdfIn PDF document text
    • https://steklo-shik.ru/userfiles/file/tejezeti.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/gabekebalafuwuxim.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1615009d000e52---27257768473.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1612f73a345faa---zugidibubokibosopenidadur.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/sereb.pdfIn PDF document text
    • https://ghnservizi.com/file/jalifebani.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/79586928337.pdfIn PDF document text
    • https://dutchhaves.com/uploads/files/202109260627527061.pdfIn PDF document text
    • http://frappsreagent.com/upload/files/36516866707.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/22289195451.pdfIn PDF document text
    • http://skomi.ru/img/files/file/83535393967.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/13896368113.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/bc98adb47608846883b9bde4ed18f913/58532244579.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/jezus.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/13709484553.pdfIn PDF document text
    • https://rails-bg.com/fckeditorfiles/file/dijusobanu.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_off0000b3c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3C5 14448 bytes
SHA-256: 5fe31819627eb4b23d4dbd4e95d12b2d45e41c41448ac4b0544c2b5a04bd4a38
font_01_sfnt_off0000d7a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7A8 10300 bytes
SHA-256: b374a10d208af325ad28b7d2add9d161d6bc2fe00f7cb639f3f2a56f8758b458
font_02_sfnt_off0000ef26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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