Malicious PDF — malware analysis report

Static analysis result for SHA-256 3be6ae1b9cc4b9fd…

MALICIOUS

PDF

85.3 KB Created: 2021-08-17 05:45:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 42c46114f2755bd390333f348fe558b5 SHA-1: be6a4c2c00cb3c2baedaa6a9820f1dbaab71b350 SHA-256: 3be6ae1b9cc4b9fdd6b4221b29bf5adb003a5feb101505dd2d451c4a33fa0bc2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many of which point to what appears to be compromised WordPress upload directories. These links likely serve as a distribution mechanism for further malicious content, as indicated by the 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b754c99d8f1---suzupamupozumamiw.pdf In PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/ftknopkikk5q7m34poja1597h5/17961498613.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/19428993082.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c761016cb1---49777692660.pdfIn PDF document text
    • https://jagominum.com/contents//files/88216073706.pdfIn PDF document text
    • http://fairmonteast1978.com/clients/71195/File/92079050970.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/50500679937.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160fff92301b87---83772738678.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/b56c4c7afa68ca5fb850ba63ed87ae27/57084186863.pdfIn PDF document text
    • https://nslogisticservice.com/userfiles/files/65200401192.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607d10969f101---gasunedegujedimevofikodi.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/87521680016.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/nna7tq4n13k627vf89kpcbmei2/rumuman.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/32520043238.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/66868091093.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cc13dc1b813---jaxur.pdfIn PDF document text
    • http://middlegeorgiacoinclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607287fe0d406---44559007910.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/7e7ab4455e6406399e7504546a1bc47c/94219788813.pdfIn PDF document text
    • https://bagstyle.uz/images/file/rujijejabibupaxezite.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/20bb25e7ca969c0a43b4d93d5dad95d1/67675699646.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/nefarijunatubake.pdfIn PDF document text
    • http://ruoumoc.com/upload/files/kidepe.pdfIn PDF document text
    • https://vernadoc.com/wp-content/plugins/super-forms/uploads/php/files/f1a0b2996d3c503d89c037127d01373c/mujunozu.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608186d560748---rovisef.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/rowafafenopixalo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=what+expenses+can+be+capitalized+ifrsPDF 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_off0000ea22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10239 10892 bytes
SHA-256: 23caa2896b250efe9e7ee04ac69529c862c5345c2e501d05c4ac0b84474f052a
font_02_sfnt_off00011b31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B31 16484 bytes
SHA-256: 6036c0ebc2c1510d97db1fee3271d8053ee8badea47a0c2353c238439e7ca119

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