Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d2017afab9203c…

MALICIOUS

PDF

96.4 KB Created: 2021-09-06 00:51:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b551ad1a2596cb4a444bb98131842d57 SHA-1: 14cf015d339d8a677bc399f8dccb1fa5832af8c3 SHA-256: 43d2017afab9203cb5cf34a4fcdd1ef949f8bfb80f9781130ef27ad1175d320d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm pointing to compromised WordPress upload storage and potentially disposable hosting. While no scripts were directly extracted, the nature of the link farm suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160795ee88995b---lidipatazinaso.pdf In PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d03e458819---pekerapizubefexatupine.pdfIn PDF document text
    • http://mondoacquapiscine.com/userfiles/files/50346973506.pdfIn PDF document text
    • https://tuoitre.bacgiang.gov.vn/lib/ckfinder/files/76487307813.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/5977654914.pdfIn PDF document text
    • http://seashoresilverlabradors.com/clients/4/48/482fd9669fb3260065120a60ccac5e48/File/fulegot.pdfIn PDF document text
    • http://www.lukoilmarine.com/ckfinder/userfiles/files/76922980594.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f26f34c7e5---kejavuxozejusogub.pdfIn PDF document text
    • http://status-go.net/gfx/userfiles/files/zilixawixebaripojupoga.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/8193092764.pdfIn PDF document text
    • http://sbairs.com/datas/files/fitijanuxumitejaseravux.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/80561635682.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f24e3a56567da5b06d5cecdd29954326/16083910494.pdfIn PDF document text
    • http://nfc.soo.jp/file/papogiwudiwi.pdfIn PDF document text
    • http://klpa.net/userData/board/file/libojuxulowujite.pdfIn PDF document text
    • https://asset-books.com/userfiles/file/18027133063.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/222ee7b265ae9b6dd4a0b42554c8b30e/gelamunilu.pdfIn PDF document text
    • https://www.ndgai.com/wp-content/plugins/super-forms/uploads/php/files/rnaveih8h6t318trjjkeh1j8uv/wofajapakevosoten.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160935b25b8270---fidenoteguxabopulu.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/fegenoraziwizosifoji.pdfIn PDF document text
    • https://cryptobasics.biz/uploads/files/kadusewetoziz.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/1954303f1fd89799882bffdeff574dc8/sekofixegejises.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=996+porsche+owners+manual+casePDF 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_off00011259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11259 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A70 10872 bytes
SHA-256: 77cfc2ca6ca66157ebe5d86da4fe9975a255f0e1caab64e3db597e315e22f9e1
font_02_sfnt_off0001435d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1435D 18380 bytes
SHA-256: d4df4d1da0c1b10c57d4c7aea703657a2ce5d561a04ad560c3db5249861e85e3

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