Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd5276523465ac2…

MALICIOUS

PDF

90.2 KB Created: 2021-07-05 09:30:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8c389d57c6bcf44ad001882b09b55ccc SHA-1: afa7c86893df65a71cbfb8b6da3cc0c0d9a7f3d0 SHA-256: 5dd5276523465ac29693a3b6d175e583f15aed9e090c7d8131dd641ba1f2cb8f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to websites hosted on compromised CMS platforms, specifically WordPress uploads. The primary purpose appears to be directing users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16075525953c68---11637678711.pdf In PDF document text
    • https://drvishweshwari.in/userfiles/file/33614575336.pdfIn PDF document text
    • http://paliukenas.lt/i/File/2822123716.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/26cbbc5467ab9a87cc60c0490b4b0e7b/japiba.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160de6aec641b3---48256540530.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/66874204229.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/b9aa9bc5efc7d6ee9c5bf27a3b189356/35081411148.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/bffccafb7bf9233cf5ea2b756840352e/gotalobomomazijibure.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/talubixetijup.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/rmatdvauhqphg01570j15sdcj3/molawomo.pdfIn PDF document text
    • https://canvasations.com/wp-content/plugins/super-forms/uploads/php/files/i75df7rf6r8ipg6rhb2tfdls47/favamodebigiwivudamaji.pdfIn PDF document text
    • http://museodegliarazzimarsala.com/userfiles/files/madise.pdfIn PDF document text
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/471ffd3266efdcae77d2e39dce1f1401/11551417719.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/g3gknqf47eu8gahio36ln3mbb0/36929591514.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/a0dca81d4a805051e9ea51d64dbd9245/zatorujelufinopaga.pdfIn PDF document text
    • https://aymsoft.us/aym_image/files/52167317708.pdfIn PDF document text
    • https://smilepath.com.au/wp-content/plugins/super-forms/uploads/php/files/8ecbbf341cc9a703a310d6fc27bb7430/57317348960.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/kuzexumobopanisesomi.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b07090d236c---bedeniganode.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/werizujunezuromez.pdfIn PDF document text
    • https://gtselect.fr/ckfinder/userfiles/files/80559842878.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/0e799b44eae7d13a5debb94124e6a044/fapazokakavolofaxewubu.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/1c1d4aa79aeae9a7828ce0108c85ed77/40832628901.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=wake+up+and+smell+the+coffeePDF 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_off0000fb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001137b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1137B 10880 bytes
SHA-256: bee059c9d43e6e1881ceb45e83aa7177ab6d3ec09180c002411ebad7656ff582
font_02_sfnt_off00012c78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C78 18276 bytes
SHA-256: e27513e83592751cb07e10f1b033435dfdbd0c0c5199e48a4cf5e370fbe0cf71

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