Malicious PDF — malware analysis report

Static analysis result for SHA-256 852481dfb1b4bdb4…

MALICIOUS

PDF

96.5 KB Created: 2021-06-26 11:07:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: c25449d346236635f4c6b272048a57fb SHA-1: c52057cca742126259acb87e4f5bd427ecc89b69 SHA-256: 852481dfb1b4bdb46cdebf50940d145d73cc32feedbc706bff93a7c7206c51c7
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs lead to various PDF files hosted on what appear to be compromised content management systems.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.ideaklinikizmir.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc351b174a---fezodus.pdf In PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/2fe8959e026e3e32081b1fcf11f93f58/4956542800.pdfIn PDF document text
    • https://upchealth.net/wp-content/plugins/super-forms/uploads/php/files/ff4862f92baf2b806992721189b535af/regiraxete.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1609f39428fdb7---52782200012.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f31143c5dd---kebofupo.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/21969204372.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608602c537230---japaropulebanutosax.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/484e8f839a7210906d0f74126235772f/57193670859.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/binekudav.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/25f63203ef781370978355867d76a1a6/vejabisabopaj.pdfIn PDF document text
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/27jqoe8kajsu1carqu371oqcg3/ruvamajosajediwebexozabo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1609884f4aa56f---rorozutelaj.pdfIn PDF document text
    • http://lex-ter.ru/admin/ckfinder/userfiles/files/3697247493.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/5b249a0124cec5df5a99139d6b6d2a99/48342859159.pdfIn PDF document text
    • http://gabortech.comadmin/file/fobuwuxuzuzenes.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/5dbbb3c881bb3897ca55c76a585072eb/dakupod.pdfIn PDF document text
    • http://evevoyance.fr/adh/.-/file/45686804469.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/06ea5baf98133ea001e79bb142702fcb/vevubetalobitisoso.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/3603b588592cdeeeab9732632475415b/xeronizale.pdfIn PDF document text
    • https://isosklo.cz./uploads/2401027821.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/a396c863d5379bca9a97bc6a43bf02e2/tusuwufekeb.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/49179062578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=best+streaming+service+for+footballPDF 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_off00011810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11810 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13027 10940 bytes
SHA-256: 7ef4b5ff77c749a873cac11f225a71fc829de50f8109e45770f40a17e605d632
font_02_sfnt_off00014996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14996 16724 bytes
SHA-256: 80c8149afb8b716955a033653bbef573eb58eccced42db1331b75d75e9907508

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