Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1ebaaa763e5feaf…

MALICIOUS

PDF

70.9 KB Created: 2021-09-01 19:12:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5badb54a4a3cd151e4ded99e3e9ace8b SHA-1: 4ed9748b33a2a7d1866d39be3645746d59cb493a SHA-256: c1ebaaa763e5feaf9db269db4602fa19cb0b28fdb2a08359d0cd2ff6156375fa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous external links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded URLs and the overall structure strongly suggest this PDF is used as a lure, likely for phishing or to distribute further malware, aligning with the Spearphishing Attachment technique.

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 https://wastran.ru/uplcv?utm_term=types+of+dynamic+friction PDF link annotation
    • http://yule-sign.com/upload/editor/file/20210601125502.pdfIn PDF document text
    • http://raczcsalad.hu/files/15270481184.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/1bcbb51921a787d6fea8a595eb164eaa/revuro.pdfIn PDF document text
    • https://edcasys.com/ci/userfiles/files/54510101670.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/vpbrrj3jj5rn4ekpu5662jcuo0/95845318451.pdfIn PDF document text
    • http://newdimension.su/userfiles/file/30177680715.pdfIn PDF document text
    • http://jointrilogy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f372d183e3---57321761915.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210827190451.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/84691028626.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/farobelilaloramojeda.pdfIn PDF document text
    • http://firegallery.ru/img/upload/wibuvedobutejusute.pdfIn PDF document text
    • http://www.ellisrasbetonwerke.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9cfb84531---67245170383.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/i79dbmlch9hs9el44477ae9at6/jexerixafuzubowopikewat.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad17e3065c---sebagereritibivibumilipe.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16126fa722e48f---xumofatuxupisemijibam.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160724492536d3---95980795554.pdfIn PDF document text
    • http://texmet.pl/userimages/file/fowenilelamowane.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vewefisepotana.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f49a002e8---levodavekaxiwugizisavuke.pdfIn PDF document text
    • http://marymo.ru/uploads/files/fudakizisakadowipi.pdfIn PDF document text
    • http://innotack.com/userfiles/files/6824171021.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a596ee1fc88---82767947164.pdfIn PDF document text
    • https://murten-hotel.ch/userfiles/files/bagawimubepatavotudimuza.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_off0000b6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB6E9 10812 bytes
SHA-256: fbe8b43c6f4123ecd45fddf36def8794f761fa2ae51b2d49cd399d4b1dbe8aaa
font_01_sfnt_off0000cfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE5 15028 bytes
SHA-256: ee759323fc39c28da4db5fa1c76021821c9cbbd945f75256a47bacc09a4d1135
font_02_sfnt_off0000f5d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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