Malicious PDF — malware analysis report

Static analysis result for SHA-256 95732eb569f917a1…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 03:14:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 35b56764e1ec588c41cee2095a7a0376 SHA-1: af4bfa590b02d17fcec0fade3a94eda383cc0324 SHA-256: 95732eb569f917a1b51d14649d5a0aded27ec24ba7152f7dee79a61969f324ac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics as malicious, including a high ML score and ClamAV detection. It contains numerous external URIs and link farms pointing to compromised websites, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the nature of the link farms indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • 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://krisoc.ru/uplcv?utm_term=harry+potter+and+the+sorcerer%27s+stone+pdf PDF link annotation
    • http://jinsonmetal.com/Upload/file/71487975394.pdfIn PDF document text
    • https://sierrainstruments.cn/fckeditor/editor/filemanager/connectors/php/fckeditor/upload/202109/file/16732504268.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/9401877f0e32b931f7daf2cb973a867c/62570017747.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/majinunofutimilopazogozu.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/lafigiti.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ef79df3760---sodafizomug.pdfIn PDF document text
    • http://chung-pei.com/userfiles/file/lixederibasadusagupow.pdfIn PDF document text
    • https://gazeta-msp.pl/user_files/File/75688981333.pdfIn PDF document text
    • http://detskaoptika.cz/ckfinder/userfiles/files/bifevusujetal.pdfIn PDF document text
    • http://photou.cc/ckfinder/userfiles/files/15259572234.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/3thansjgk3qlo7j90rvspm6mi3/65896341702.pdfIn PDF document text
    • http://www.emploi.nat.tn/ckeditor/ckfinder/userfiles/files/64727327152.pdfIn PDF document text
    • http://enovosti.info/ckfinder/userfiles/files/41293592422.pdfIn PDF document text
    • http://mastervgtour.by/var/upload/file/48966956352.pdfIn PDF document text
    • http://meimagedance.tw/ufiles/files/24885489675.pdfIn PDF document text
    • https://ostrichtours.com/ckfinder/userfiles/files/32328990549.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135871a48a58---titalagosi.pdfIn PDF document text
    • https://profm.hu/files/file/migug.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142f2da99895---zanarisasijogow.pdfIn PDF document text
    • http://good163.cn/Uploadfiles/files/25758998734.pdfIn PDF document text
    • https://miaousland.fr/ckfinder/userfiles/files/mewaxufit.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac9215fdd6---wolagakowigerix.pdfIn PDF document text
    • http://daydreamspin.com/userfiles/file/41155133847.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_off0000bd93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD93 17496 bytes
SHA-256: 3423af995c62e14ce17c26f9d43f979cb9b863c1d9cead819d593d57d44c3db9
font_01_sfnt_off0000ea39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 10716 bytes
SHA-256: 4344554ee7a79b2a4f085167ab70a4c0bf97953fa530decc2e28d4979f347a6c

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