Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a466b1201aaf820…

MALICIOUS

PDF

85.7 KB Created: 2021-09-11 15:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8da35eeac1f34005ae9b6a967d20632 SHA-1: 4ae32ab6e82a45cc6e276cfb75b46c2ac21d31f0 SHA-256: 0a466b1201aaf82080a0ea0008b7a71578874cec907427b4c869cc48a2024997
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate the file is designed to redirect users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://qkon.ca/images/file/90132351521.pdf In PDF document text
    • https://susta.vn/userfiles/file/18081460899.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/79797690715.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/11403860713.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/84683406925.pdfIn PDF document text
    • http://vhktn.at/images/content/files/27575354886.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131d59fc5e48---molel.pdfIn PDF document text
    • http://52fotki.ru/ckfinder/userfiles/files/kopufedebunumudivageb.pdfIn PDF document text
    • http://www.ctnphrae.com/ckfinder/userfiles/files/54148613622.pdfIn PDF document text
    • http://bdpq.hungminhits.com/files/uploaded/files/sovasigepavokewaket.pdfIn PDF document text
    • http://constantemail.com/userfiles/file/1631282731nanovejemixo.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/5934813246.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/27123514086.pdfIn PDF document text
    • https://deltarealestate-eg.com/userfiles/file/21710327581.pdfIn PDF document text
    • https://rajatotogroup3.com/contents/files/xiwajunefoxaruwimepar.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613be2739e105---81027883448.pdfIn PDF document text
    • http://anadolumatbaa42.com/genelresimler/file/lasogifufuk.pdfIn PDF document text
    • http://rulada.by/upload/editor/files/pizesuwewigejusawili.pdfIn PDF document text
    • https://capecoralliving.com/media/file/29255154241.pdfIn PDF document text
    • https://marblo.ph/app/webroot/img/files/7610151395.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/16704882752.pdfIn PDF document text
    • http://mtcongnghiepxanh.com/upload/fckimagesfile/27327490431.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/7899341808.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132190e74ed3---32865057270.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/gifomamubobajibolunixe.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/belobun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=equation+for+finding+the+vertex+of+a+parabolaPDF 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_off0000e4eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4EB 11144 bytes
SHA-256: b9facd31a9ec4d4918e01c1dc01f6e66951f9dd71f7aff14f8b4f2f2b5ca5391
font_01_sfnt_off0000fe18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE18 19544 bytes
SHA-256: 6da326020f4f853e39657cfbafaa7207b3c996fa53cce80d62606a57e8c8c5c2
font_02_sfnt_off00013029.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13029 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1