Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4f61a747e6525d1…

MALICIOUS

PDF

84.8 KB Created: 2021-09-15 12:15:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: d642b4c29ef773935df1df753ae2b22c SHA-1: 44464f0523375b922cffac26d95bda0979b0e27b SHA-256: b4f61a747e6525d14f9995af0f8429bd85ba23d823c56b0cca0dcde94c67b2b4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. Embedded JavaScript was also detected, which could be used to further obfuscate the malicious intent or initiate a download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=what+is+the+best+gun+game+in+the+world PDF link annotation
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/1bb76f9b11b32181a59e52715f7a27a7/13361700731.pdfIn PDF document text
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/64324648560.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141828043b02---25826656414.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/a04d55bfd2827aa10dd60f0b91805868/21194542154.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/16100138829.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/30905062698.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210915153850.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/nusevalinapetud.pdfIn PDF document text
    • https://bimore.vn/webroot/img/files/sisiraworuva.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/duwunebibarax.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/aaf154aad11b1f21646979868f16f02a/61330028157.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d4756cb83d---wibufesixokukivavax.pdfIn PDF document text
    • https://samarthanamparisara.org/apadmin/uploads/userfiles/files/gaporibila.pdfIn PDF document text
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/8286210518.pdfIn PDF document text
    • http://kzlo.pl/fotki/fotki/file/wobomowenimanof.pdfIn PDF document text
    • http://festacreativita.org/userfiles/file/kefijemekilojuregifo.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/wusivozokigipemobuluwez.pdfIn PDF document text
    • https://bouveau-consulting.com/userfiles/file/mamonajixujomuzipaped.pdfIn PDF document text
    • http://kawana.tech/userfiles/file/56252592320.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/gazoxevinivixof.pdfIn PDF document text
    • http://vinhosnorte.com/images/files/13970131656.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/47423682218.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/kotarobokowutorelaromoda.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/161313946982d4---ravivolopim.pdfIn PDF document text
    • http://sjzhtchem.com/upload/files/wuvemunakovogi.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/2804217183.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_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 11012 bytes
SHA-256: aa43ef6569baa3bcd9314ce27aec66ea744b1bdc437be4f5fdc84285141e609f
font_01_sfnt_off0000fef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF5 17736 bytes
SHA-256: b79bb06bb75d4c7b612eaf7d6e0b0aa802335e4e9796e4d9fb95ca69d7dc0e7a
font_02_sfnt_off00012cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CD7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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