Malicious PDF — malware analysis report

Static analysis result for SHA-256 148ce68e53b008b9…

MALICIOUS

PDF

83.9 KB Created: 2021-08-11 21:54:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: af71ebf29e95474c732b2918321805ea SHA-1: e33b7ec14c376b4288a2d4a3232dc3634f42801f SHA-256: 148ce68e53b008b979713622cd6faec25a9a4197b45d7980dd6a428ac6520de2
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged as malicious by an ML classifier and contains multiple heuristics indicating it is a link farm hosted on compromised CMS uploads and disposable domains. The embedded URLs likely lead to malicious content or phishing sites, aiming to exploit users who click on them. The document's structure and the nature of the URLs suggest an attempt to distribute malware or redirect users to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/1610335bbb6cb9---raduri.pdf In PDF document text
    • http://bitite.lv/media/txt/122/file/30957916779.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/foxorufopuzuzapewize.pdfIn PDF document text
    • http://tfforming.ru/d/files/befif.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/26132912665.pdfIn PDF document text
    • https://implant-drill.com/userfiles/file/dinujubofasi.pdfIn PDF document text
    • http://www.detskaoptika.cz/ckfinder/userfiles/files/zuwelasufigiwodebijexev.pdfIn PDF document text
    • http://quangcongluc.com/upload/files/zusesujufifomepesem.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cacae7da8a7---nibozunebop.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/gamidinokus.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16112bb42d831c---81324008120.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d7d976e278---sajetopidonetosekukujaf.pdfIn PDF document text
    • http://olgapolyakova.com/files/files/97049576408.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/63308769702.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/9c9681df983783804d1c13356c82b078/fikejamevob.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/p6gjnkop2hnjdg8d31u86oadj5/48055051549.pdfIn PDF document text
    • http://geyikkimya.com/userfiles/upload/file/41470298238.pdfIn PDF document text
    • http://gangwonbnb.com/FileData/ckfinder/files/20210714_980DEC6D25AE7D59.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/2b747792596f6506ee02c93e8fa5710c/satulotufadusawov.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106291537416431.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1c2d971914---14951592838.pdfIn PDF document text
    • http://studiolegalezullo.eu/userfiles/files/82271399261.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=briggs+and+stratton+p2200+owners+manualPDF 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_off0000e38c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE38C 16884 bytes
SHA-256: f57de46737d3f895f0df5ebecd19512965c15ede5801239a0f1448a3669e0121
font_01_sfnt_off00010fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC7 11216 bytes
SHA-256: 36be27602f0bc2480fb5373aef821496436da120afd4588360fa76a0829f5d97
font_02_sfnt_off000129f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1