Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7841149d1a2b6b4…

MALICIOUS

PDF

104.1 KB Created: 2021-07-06 03:55:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: ceafc1b06f005ca32741dd53d5139a47 SHA-1: 818664d7ac883ac6a7b41b1993460a6121cca3ff SHA-256: d7841149d1a2b6b45ca082d83276a2189725b74df7070a1732f54661559996e9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which are hosted on compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious destination. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure suggests a link farm designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0abb8e1b6c---tatatozilubuvadu.pdf In PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160989e70afcea---zovutovapegixovaxezo.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/e41964cafe1a7bd88c322fc958eacfdf/74944991062.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cfded9897e---58655473448.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/79804852195.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/p0v8cq3p26qos9cgdu118j2r6s/79511782775.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/zibilojelekipewuzuzebe.pdfIn PDF document text
    • http://kbchina.de/upload/napuvafobiguz.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a84bde01f---fuwojofokebopebu.pdfIn PDF document text
    • http://lynxitservices.com/ckfinder/userfiles/files/57107156981.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/ce402efa5fd9d923a1a9d16734039bd7/komazezodowen.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ce7cf85f0f8---42455193565.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ec504bf94c---19068033178.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/mmkt969himjujulgjutf0hcgq5/91464827509.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/89063ee6276bb955be9ce47e65804ec9/lereden.pdfIn PDF document text
    • http://johncarroll1967.com/clients/1/18/1896e795ecc2602204d707ec4e69586f/File/95116001524.pdfIn PDF document text
    • http://dichvu12h.net/userfiles/file/fuzolisomowuxezak.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/75150844004.pdfIn PDF document text
    • https://aedwea.com/upload/foto/sijogozax.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/bceb6b4003b0fb26748ed95c818b917b/magewoxi.pdfIn PDF document text
    • http://numberonerevolution.it/file/1281022356.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/39337401685.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b23a635fbf8---88749696213.pdfIn PDF document text
    • https://www.sgestrecho.es/wp-content/plugins/formcraft/file-upload/server/content/files/160975115cae28---kemebipofaxatinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=sumo+east+and+westPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 8476 bytes
SHA-256: b70231db6e1f25f13ffc5ca4a1fbb171552bbd0910376e2c7ff3a5e58ef85486
font_01_sfnt_off00013847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13847 16440 bytes
SHA-256: 4105340ba96462592d1c48a3556537c9da52793b096b90e24e43c28a43f8681d
font_02_sfnt_off000162c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00017ade.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ADE 10432 bytes
SHA-256: 0c6d88b71d8ee074133890dc966126cc7360ab27964cb4f29c727e3d10892997

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