Malicious PDF — malware analysis report

Static analysis result for SHA-256 18c6cfa2d5a9ca47…

MALICIOUS

PDF

85.2 KB Created: 2021-07-04 07:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: cc1c7ea345b2216e0a0b697045a48ad3 SHA-1: 22b33810a3e1ae33678202d2a6f0f621048e32d8 SHA-256: 18c6cfa2d5a9ca4753fb650628b13d2fd3001e0af44cf660ab2563677c217a42
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The file's structure and the presence of multiple external URIs indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://allytemp.ru/uplcv?utm_term=dwg+to+dxf+online+converter PDF link annotation
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b349cb17d---wolelefabuwodafob.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f461e5e090---75214042639.pdfIn PDF document text
    • http://beveragesgs.com/userfiles/file/sadarewonokelul.pdfIn PDF document text
    • https://functionalmovement.gr/wp-content/plugins/super-forms/uploads/php/files/ec62c86a5f3351323bbcb3765f3e2854/15859715760.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160866d7f8bbca---56315622520.pdfIn PDF document text
    • http://www.maarsehoveniers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad58b3c032---97255814141.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16085b8f472b1c---77779574219.pdfIn PDF document text
    • https://suhrsmad.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160c3c0622b577---zovefugibidupekov.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/a1130e932274af5db4c1f4073be722fd/58960554419.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/lawubajeguwiponaxurewulag.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/38443560720.pdfIn PDF document text
    • http://dzbnf.com/upload/file///47639282577.pdfIn PDF document text
    • http://srub-servis.ru/userfiles/file/posoxumupikul.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/de6a3c59ea3246c95de5d53ce426e699/xedonu.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/lelagexupitofijo.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/4b83c0a1537baf43ec70253e6c61fa15/68862142165.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/28539357535.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b946a32bdc2---zikazamokitari.pdfIn PDF document text
    • http://indemo.pl/Image/files/20269816807.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/69fa415131ac8e277709f6a3fb8a72b3/17434207861.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160835c625d402---xonov.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a7235b82a---56515250705.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/fc8b16aa4ab838b8bd1bafb355c4fbfe/22301229732.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd0b6615b1---63206273568.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d35d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD35D 17612 bytes
SHA-256: 169026c8fa95e14c0cea2d84e68ef299989b15a7b809c450af30e2af1b9c9632
font_01_sfnt_off00010105.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10105 10576 bytes
SHA-256: a183225b282cc62c8e20c71e80a24717fc9b1727c70504d484e622c26b608df9
font_02_sfnt_off00011914.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11914 16276 bytes
SHA-256: 7a21503f1a631df5467061909af034d8ad5152d8fa6cf31a27c53f85189f7d62
font_03_sfnt_off00012f14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1