Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e9b9d3cec216e2…

MALICIOUS

PDF

86.7 KB Created: 2021-09-19 01:05:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ac07ea7314cc82ad6ad10aea581598a3 SHA-1: 665434361e04cfa10bd08faa7ca2fc26e51d6e6f SHA-256: 41e9b9d3cec216e28b8d6a02e677e4b0505030b8919e6ba79167606ac731731e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV detection. It contains a link farm pointing to numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of external URIs and link farm characteristics indicates an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://infrive.ru/uplcv?utm_term=how+to+unlock+simlock+iphone PDF link annotation
    • http://kingsfci.com/userfiles/file/mojufununi.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/30702750911.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/d67bf2a1ad8d621b29bfa4a83ac4d723/bosozozananate.pdfIn PDF document text
    • https://elperrocallejero.info/ckfinder/files/24207865954.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613838c8efe61---kugavopojidabovolabeneliw.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/26496158518.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/89572262746.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/73924970855.pdfIn PDF document text
    • http://jrecchina.com/ckeditor/ckfinder/userfiles/files/75567127447.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/051759479005.pdfIn PDF document text
    • http://gesundezellen.de/neu/userfiles/file/16333643763.pdfIn PDF document text
    • http://lingeriedediva.com/UploadFile/file/2021090714150873499.pdfIn PDF document text
    • https://kochitaxirental.com/ckfinder/userfiles/files/28022660679.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/womulufosanutinoxul.pdfIn PDF document text
    • http://fuyu.010bi.com/ckfinder/userfiles/files/deruzezupefumise.pdfIn PDF document text
    • http://richmore.kr/uploadfile/fckeditor/file/99457142658.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613995c11df73---43184718287.pdfIn PDF document text
    • http://bongoes62.dk/userfiles/file/24864205848.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/17912377703.pdfIn PDF document text
    • https://koncnc.com/genelresimler/file/rumumeboxuwadadaj.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/wupojevageja.pdfIn PDF document text
    • http://stavo-bazar.cz/userfiles/file/50950761558.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/16146443b71bbb---51904427269.pdfIn PDF document text
    • https://0a3exp.com/upfiles/editor/files/vusoxabekolupopoponu.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/38113980444.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/c8b33iri572lu0gsnvf4p5lim3/nadopomujabakefebenipevit.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/da87e8186461ee16ecef7c0b2705fc8a/10348754251.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_off0000ec3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC3F 18620 bytes
SHA-256: 699f2a9ba80a1e5ea9274b07feac908591d5acc7e193da95f076eeb6cdd556be
font_01_sfnt_off00011cd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CD2 10644 bytes
SHA-256: 529bbc26b943bc13f6aa0fb715e67ac556661cfd3bb97bd222cc9fee97ebe28d
font_02_sfnt_off0001350b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1350B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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