Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ed0074b66ea53b3…

MALICIOUS

PDF

70.5 KB Created: 2021-09-20 16:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 4b90470ed5ee892a89560f7e3ed4def2 SHA-1: 1c0aaa6d44b2fa092882ef3a7a929041d6bdfe26 SHA-256: 8ed0074b66ea53b31a8590bafcac95c5abd076a41af3be135463c522e1415fa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, forming a link farm. The primary purpose appears to be redirecting users to external sites, likely for phishing or to download further malicious content, aligning with spearphishing attachment tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://www.frank-diagn.hu/userfiles/files/zavawegazibar.pdf In PDF document text
    • http://camelliafb.com/uploads/files/202109051521397800.pdfIn PDF document text
    • http://georgekoldun.com/var/upload/file/madovati.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/zibudusadifofejizirezade.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/larimupoz.pdfIn PDF document text
    • http://miyisz.com/mingyi/images/userfiles/file/87637284404.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/161479ba0d5492---reriwozasexot.pdfIn PDF document text
    • https://blokhol.com/upload/files/80346701017.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/40280129901.pdfIn PDF document text
    • http://chanakol.com/ckfinder/userfiles/files/64809032019.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/161376df67f383---zopuzuwizajubixixego.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbf671716c---vasuliruzudimojajolufet.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613a459db10cb---15706671628.pdfIn PDF document text
    • http://manilag.com/FileData/ckfinder/files/20210914_58F8E50D5A641478.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210903224437.pdfIn PDF document text
    • http://rothemtour.com/FileData/ckfinder/files/20210910_676CEEC28BFDB67D.pdfIn PDF document text
    • http://japanbizkorea.com/userData/ebizro_board/file/xurovorupuloxadazoxim.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/49483336314.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/wujolosodabasobedefubir.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140081c584d3---mupokafituwejatitof.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f11691a002---sarasodojopezajix.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/repoderasejedopitemik.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/siwatolupawifukaniwire.pdfIn PDF document text
    • http://blfimmobiliare.com/userfiles/files/dunokapipajiluvamixuxulaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=fishing+games+for+android+free+downloadPDF 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_off0000b4ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4AB 10764 bytes
SHA-256: 775422a53f70b80942a2578ec315b70cf52cc5af9f02b0979264daf288187d4c
font_01_sfnt_off0000ccfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCFE 15476 bytes
SHA-256: 6a7024f51dfc53b2648b93c68250b3819665279c53a8160f7530db6a6670dffe
font_02_sfnt_off0000f46b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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