Malicious PDF — malware analysis report

Static analysis result for SHA-256 194b4eda3a3ecc28…

MALICIOUS

PDF

94.5 KB Created: 2021-06-30 22:33:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 7310a24c65b707eaaa549078936ee469 SHA-1: f15a2b2243509c9272da6005c82f55c61b8c9925 SHA-256: 194b4eda3a3ecc28f3e2a4f088b69fb55e9d91db4b5ffba896d6b1521a579ee2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to numerous domains, many of which are identified as compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic confirms the nature of the links as a potential SEO manipulation or traffic redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://geose.ru/userfiles/file/32682427593.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160884edfb7932---rupazuwakotitekararubi.pdfIn PDF document text
    • http://ofipapel.org//ckfinder/userfiles/files/giguvij.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/pofamapi.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/lojetelu.pdfIn PDF document text
    • https://csp-pub.com/stockages/files/kojolopujaguvogurotifivo.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/dazibepakavodaxog.pdfIn PDF document text
    • https://foundryindia.org/userfiles/file/guxukufovatokidenimij.pdfIn PDF document text
    • http://liffeyartefacts.com/fckimagefile/file/67054113500.pdfIn PDF document text
    • https://prcomponents.com/ckfinder/userfiles/files/76520417115.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160718b05ea341---tebisobolunulebo.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/2debffce61d3a6ab2b5c6a51d90258bb/tuduwuvutagonoloxivud.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/4785962078.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b453601aab0---lopoxugalimupo.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/lepiviwufagon.pdfIn PDF document text
    • http://billsky.ee/files/file/kipilipabafepujusev.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/v79an8csigaffg7ofi228ctt2t/81301157658.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/eucrjc7m18esu6td9fcbk50ck1/tukolud.pdfIn PDF document text
    • http://abpaluso.com/upload/file/geguwasilobawizura.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/89344984978.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/005dea45c14564939fa3774cee050bfa/tenowogujimeluz.pdfIn PDF document text
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098317dcf570---35872457895.pdfIn PDF document text
    • http://majorpropertygroup.com/userfiles/files/mixikiwuxevunu.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608adbe38162c---soditazetajijusitos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=botw+firefly+questPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7B 18828 bytes
SHA-256: 6c22ae98af7432fa80a4af87bc4e72e4b6c6ab42b3235b7ada5551deb7fe3afe
font_01_sfnt_off00011dc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000135ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135CE 1664 bytes
SHA-256: c737c1571b827a9af515084efd4d135d2c05ce8763284746c5506df3322eddb3
font_03_sfnt_off00013dba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DBA 10440 bytes
SHA-256: fe2503d83011e2ade4f4d298b39810bf38d77697a7f91f542becfeb6c290d40c
font_04_sfnt_off000155a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155A4 16340 bytes
SHA-256: 88a5f3ad9079b2340172ecd64f1cd79ba1ad1753eb2b73e58de10c5a7be67d15

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