Malicious PDF — malware analysis report

Static analysis result for SHA-256 18426b4c0aabd10c…

MALICIOUS

PDF

89.7 KB Created: 2021-08-03 11:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 14f78ed69622a5cb82286555fc79658e SHA-1: b456cd5c4eeaf6e510edc62e158602d79c2a38c9 SHA-256: 18426b4c0aabd10c8e55d3fedb48fbeb1945af82626c992de508ac756ccaeb4c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains a link farm pointing to compromised CMS upload storage, suggesting an attempt to host malicious content or phishing pages. The presence of embedded URLs and the nature of the heuristics indicate a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f27bd19845---39531900041.pdf In PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/c54c77820ae655a6d9cd3f084c8416e5/devabozidokozawunekileri.pdfIn PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/bowewakimomovufir.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8b384b066a---togema.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/jazezufuzulekubefuwuwov.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/fd510b0ec3537b2058b34715a155fdf7/10951650825.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d87896b825---30420663359.pdfIn PDF document text
    • https://rimsball.com/ckfinder/userfiles/files/15382506199.pdfIn PDF document text
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609215d78b3e8---2181177743.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad969979d7d---28184587710.pdfIn PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/7ee59726d1874d3ca26a6f2c21aff092/46443171484.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/24645765278.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/os13jl41mbor1fni82s2968k54/10207568226.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/96899713892.pdfIn PDF document text
    • https://blagoustroystvo24.ru/ckfinder/userfiles/files/77762873158.pdfIn PDF document text
    • http://chongros.com/userData/board/file/49799463535.pdfIn PDF document text
    • http://uceng.net/_UploadFile/Images/file/mojaxawafur.pdfIn PDF document text
    • http://mosvag.ru/img/lib/file/25855912347.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/5170948550.pdfIn PDF document text
    • http://chelseacarpet.com/ckfinder/userfiles/uploads/73017514399.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/525ac41fcc5ad4ab92c19aeb9d9c68e5/52420931983.pdfIn PDF document text
    • https://www.erenang.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608440b14d328---judaxezurusi.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/16574826186.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/ur1renuhm0s1qpecboq6f87h67/fekovisixonazadago.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/xazito.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/66942299287e2ffbef2ad9dfb2e210e9/68836146032.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=how+many+types+of+revelation+are+therePDF 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_off0000fa04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA04 10880 bytes
SHA-256: ad8c189947b8fd503ef0bb2071c037f8ecfbddc8731c8a86c4251620b08b0043
font_01_sfnt_off00011303.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11303 16820 bytes
SHA-256: 63bc2c8aba5668a8a17ca3c7bb80bca3127893a4fa2e93acb631f7e5ca881a65
font_02_sfnt_off00013ead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EAD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1