Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef40b216c9470458…

MALICIOUS

PDF

78.3 KB Created: 2021-06-27 02:44:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0d625db5f82e95eeefd4dfaffc581d21 SHA-1: 21cfcf1900bb1555a715b2e977f580e9112bba48 SHA-256: ef40b216c9470458d561fa48289d9f148a38b6ec3eed0b35af3c95da3e842d43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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, presenting numerous URLs that likely lead to phishing sites or further malware downloads. The presence of external URIs and links to compromised CMS uploads suggests a distribution mechanism for malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://chcial.ru/uplcv?utm_term=subconscious+mind+power+pdf+free+download PDF link annotation
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/cda6eb32d589320d2e14c17ed53dc9ee/29363161594.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/vdoroheru0vk5quacu0g1mlr3e/62739588901.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/80d84f664680bd348a71eaf0901ed7b4/437860696.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/986e02a89e7ffd85f5974971d73873e0/muxitubodupatis.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210510010239.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/mumugufuzumu.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160a431c2b93b5---xiriripa.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/f7oarck6dbr5v7dr0igiu7c5km/15291916610.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0240b99785---9438894993.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077850f5c80d---gakup.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/22906225284.pdfIn PDF document text
    • https://marksiegeldds.com/wp-content/plugins/super-forms/uploads/php/files/e2e8f86390a691ca22116866676d4e20/1599650918.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/19ce141ef57793ae1ba497d256860a55/xozumutibud.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/barupibifijaposanajipawe.pdfIn PDF document text
    • http://asbu.net/uploads/FCK_files/file/45660012505.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ad93f8b6ad---10302543227.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/dlm8aqki6uk44rt75bdn9r64ob/fugura.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/julunuxefome.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/n32j5bamebcldcskgp6rn7ovio/20811330859.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c78ae705f3a---nejewogudegerelaxo.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081b951dea17---78069296364.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a378a8d1178---rumidigaz.pdfIn PDF document text
    • http://royalwedding.jp/images/blog//file/11441711535.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_off0000ccad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCAD 17568 bytes
SHA-256: 1119fd547d6f21aec981f511c5209b0172a6a44d2826869e7f47727547e47590
font_01_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 11084 bytes
SHA-256: aa31ddf84f9a1b08fb5a1c2fe1baec2437d89fe7cfcd3f858aa04b6ad5ac99e1
font_02_sfnt_off000113eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113EB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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