Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8483e1da23a2ecb…

MALICIOUS

PDF

73.2 KB Created: 2021-09-04 14:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 883fb57e4cf0670aa8a34aa34bd44b65 SHA-1: 24a701516e92c40d5b6d3eb130e37f4d2aee5489 SHA-256: a8483e1da23a2ecb7ec9ca9f9975d4cdc1e0fc262ed5195ed924f48d5321e025
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, identified by heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM'. The ML classifier and ClamAV detection strongly indicate malicious intent. The primary attack pattern involves directing users to these compromised hosts, likely for further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://hillsclinic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/gewufakeduxas.pdf In PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf701930a1---pikukufejuxon.pdfIn PDF document text
    • http://adance0112.com/upfile/editor/file/83874698989.pdfIn PDF document text
    • http://medeeatour.ro/mm/file/miwosekakure.pdfIn PDF document text
    • http://pjcwyy.com/upload/file/77808017816.pdfIn PDF document text
    • http://liveisagenix.com/ckfinder/userfiles/files/visijakafuzotar.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/pazetofisebajudagotejufa.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab8a888dbf2---72680539978.pdfIn PDF document text
    • http://kerekagy.hu/UserFiles/file/62339124700.pdfIn PDF document text
    • https://darkoyunpin.com/calisma2/files/uploads/lajukenawirofivete.pdfIn PDF document text
    • http://tourbusan.net/FileData/ckfinder/files/20210801_AE794651196E06A0.pdfIn PDF document text
    • http://wajl.net/img/file/202172224651.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9054aac6e---zotudu.pdfIn PDF document text
    • http://wilkinsconnection.com/clients/9/94/94ba1e7d864c5c8af3bb481f5f9f31de/File/89909870334.pdfIn PDF document text
    • https://cuichi177.com/uploads//files/202108081749499753.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c17107f0fa0---vasakibavogutizanaxuva.pdfIn PDF document text
    • http://dianacb.cz/userfiles/file/kameruzufimifefid.pdfIn PDF document text
    • http://techbis.pl/files/file/tilusala.pdfIn PDF document text
    • http://cathugo-catamarans.de/res/wysiwyg/file/22155867651.pdfIn PDF document text
    • https://fong-cai.com/upload/files/16776057301.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/66qq1g9d0gudsr9qvht5kkn25v/37348750194.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/7f81135c04da9e53dec86140adf63d2c/vewizaguvotuzot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=geotechnical+survey+pdfPDF 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_off0000bcac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCAC 11036 bytes
SHA-256: b4ce37bbf3710cdf8c17fd61f561ddba49060c8b5d7ee7db7f54a82a1fa48078
font_01_sfnt_off0000d65d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE6F 16020 bytes
SHA-256: c51a399cdf961a758b1fdce7ff93d34ceb79cb8341ab953d7a3142fe70b0cba4

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