Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c23ee5754daed9…

MALICIOUS

PDF

82.8 KB Created: 2021-08-11 17:57:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3817be36fabc9cd3267234ee9024ffe5 SHA-1: add47ef085f9c7af4634b43e886c6693c2922dee SHA-256: 71c23ee5754daed9806058928127bc0ba85b9909e6c0a9eb735dd430c1e79445
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous other PDF files hosted on compromised websites. This pattern is commonly used to obscure the ultimate destination of malicious content, often leading to phishing pages or malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://anapro.com/ckfinder/userfiles/files/boresavarigimiwomigeti.pdf In PDF document text
    • http://orderleesushi.com/uploads/files/lixovukuz.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bad851745c8---kedudimizesinad.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a713e7278d9---jidegulo.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/76816147574.pdfIn PDF document text
    • https://schachverein-marchhoefe.ch/fcsr/news/upload/file/pimowegogoxepatewi.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/vj0n6phsliifelfb6fvi6mu620/36997339151.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/64293013734.pdfIn PDF document text
    • http://charontrade.hu/data/file/80955772103.pdfIn PDF document text
    • http://eotp.info/sites/default/files/fck/file/mamoxiviwuwutajak.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/17771170383.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/30333135103.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad3ce2370ea---75656104821.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd775dff37---sivupitipanoxumorefozit.pdfIn PDF document text
    • http://phuongninhphat.com/uploads/userfiles/file/45813775193.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3b017313---69097220053.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/94158856176.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/66926066228.pdfIn PDF document text
    • http://vencedor.coop/images/admin/file/59047373116.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eff6411b8e---12886220964.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/25866023738.pdfIn PDF document text
    • http://igorodstore.ru/files/userfiles/files/vuzipi.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/f3f3d359f181255cf2b0f65efc635f8e/rafogadavovejarupiv.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ecaadbd4951---46953178321.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=amman+bakthi+padal+tamil+mp3+song+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000deef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEEF 11076 bytes
SHA-256: 29d9df5c292285ee120ea65024da5961fd4bfb93d89210767a0488294760a8ed
font_01_sfnt_off0000f82b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82B 17188 bytes
SHA-256: cd9e5128647fbabe2cfad465547b27d3946fa61e31949a29f9e1ca23900af0e0
font_02_sfnt_off000124ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1