Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f6ee5aacbf459a6…

MALICIOUS

PDF

96.9 KB Created: 2021-08-13 09:09:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6d81c20e14122ea884554522030e84d3 SHA-1: 6a0b0429c4bdea56f3c9c02de4d3f250d6b158ca SHA-256: 6f6ee5aacbf459a6e109c8db780b565153bbda23f6bf73faf024aecffce6022a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised websites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://irlanc.ru/uplcv?utm_term=forza+horizon+2+barn+finds+how+to+unlock PDF link annotation
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160c5ad1866483---jedoxonegupugeja.pdfIn PDF document text
    • https://jjcfurnituremaker.com/userfiles/files/53144115046.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/88594362219.pdfIn PDF document text
    • http://porpora.eu/imagenes/imagenes_contenidos///xuwabekefobazapojuditi.pdfIn PDF document text
    • https://micsys.in/userfiles/file/sojakufafesitizakapi.pdfIn PDF document text
    • https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/11a233f807776bfcdcb9c58ab76d0a43/pazilifixepofimejawuwiloz.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608ad46c9a812---foxititewosebax.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/3kb14o8aphg2gk8eh0lbo3snvk/nelenodi.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/goxodabi.pdfIn PDF document text
    • http://mytaylormadefamilyusa.com/clients/864113/File/61385393970.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b467cfad5cc---jivibarabefifonetipip.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c6adf38868---23107359807.pdfIn PDF document text
    • http://goopenapp.com/uploads/files/87304368320.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/karov.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160a4ee9304072---62486222996.pdfIn PDF document text
    • http://axiomestates.com/userfiles/file/minekekawu.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/dezopexurokizadipa.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d96d2268eb2---35347879991.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad484b96e3---fonulazozerenutupa.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/budulenovugi.pdfIn PDF document text
    • http://topas.lt/userfiles/file/30864905945.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16104e2ce4a0a1---18464068536.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/96dbd2201cfedf26eddd59e5ecbda5a5/pixozixirarevejimatirem.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114d6c01e121---16752654355.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_off000111b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B2 11016 bytes
SHA-256: 308bf98e5d21000229c82b90999be34ebe20b1f160834f666e1cb84e9d05b9c9
font_01_sfnt_off00012b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14375 18224 bytes
SHA-256: ea09008f383e2145a47c15831073e006bfc11beca73fbb1a770ae4665c8cfe1a

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