Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d01a4b17cd8f1e7…

MALICIOUS

PDF

90.9 KB Created: 2021-09-12 22:54:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 351639fa35ef82fd4bf6a3952619d5f1 SHA-1: 129fedccf85578478bade0cfc93e681ffdba054b SHA-256: 1d01a4b17cd8f1e75c121e95ffe4acd20cd972348327ba76ad87233b712fdbeb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external sites, many of which are hosted on disposable domains or compromised CMS platforms, indicating a link farm designed to distribute malware. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution disguised as a download lure. The presence of a 'download button' heuristic further supports this. No scripts were extracted, but the overall structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9777

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://globalcircle.club/userfiles/file/warebenivawin.pdf In PDF document text
    • http://alompar.hu/uploads/content_files/files/lawaganufis.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/rurunibunoxarijixe.pdfIn PDF document text
    • https://ferest.ro/imagini_ws/fizedubotiriweniwodowir.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/8440030048.pdfIn PDF document text
    • http://kerama.altrodesign.eu/ckfinder/userfiles/files/kuvofom.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333812940ea---41043814037.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350760c0cc4---toxosudusewuvototimu.pdfIn PDF document text
    • http://flexa.cz/docs/file/kexiru.pdfIn PDF document text
    • https://5703n1n6999-6a55.com/contents/files/jiwanibesenelodavinusoneb.pdfIn PDF document text
    • https://noelex22.org/userfiles/file/dixemijizavidoze.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/jelose.pdfIn PDF document text
    • http://digitalpolicycouncil.org/imagenes/file/45689202519.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/44923239421.pdfIn PDF document text
    • https://gjbuyerbroker.com/userfiles/file/6327348925.pdfIn PDF document text
    • http://elektrostroy.kz/ckfinder/userfiles/files/fojidaw.pdfIn PDF document text
    • http://dhf-china.com/d/files/12124666273.pdfIn PDF document text
    • http://sladkiy-ostrov.ru/userfiles/files/kisuzezaluvugujitaxisoxuz.pdfIn PDF document text
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b1d3908fcd---20762063148.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/mofukunagozogenemolesow.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/21301521587.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/rirenikag.pdfIn PDF document text
    • http://goldmustang.com/files/files/kosexodobu.pdfIn PDF document text
    • http://bishnutoursandtravels.in/userfiles/file/josafagipipewore.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-6/20210906135735229408.pdfIn PDF document text
    • http://mylodge-naoshima.com/kuviwisositab.pdfIn PDF document text
    • http://scoutpate.com/userfiles/file/65123882302.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=diamond+rush+game+downloadPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD668 10784 bytes
SHA-256: 610f4516e72e90d2e7c609036052e8ae42721170b2cde18877e0b964cf4198cd
font_01_sfnt_off0000eecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECF 25248 bytes
SHA-256: 7cc932e208f5d2826570dc21cdfd91965ff4d65461b33079700754fe41dce595
font_02_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014685.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14685 16392 bytes
SHA-256: 7882ee3ecb7e58691407ea7f5e584c20d5f5c2aa960a61e3c08dfa3314e6ca6f

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