Malicious PDF — malware analysis report

Static analysis result for SHA-256 46f4eebb751a4b4c…

MALICIOUS

PDF

71.6 KB Created: 2021-09-13 08:14:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 14226a23670d3e7f3f7e925d95c97820 SHA-1: f3973db25ad974f35f645247f82dbac84510c1f3 SHA-256: 46f4eebb751a4b4c14eb52ca80c9f64440c96b21c7ee4e6b24693e6c3423c978
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://yenidenyuzlendirme.com/ckfinder/userfiles/files/5755046860.pdf In PDF document text
    • http://dubilex.com/userfiles/files/43250710825.pdfIn PDF document text
    • https://cantarefides.ro/admin/userfiles/file/83925254049.pdfIn PDF document text
    • http://nedvizhimost-v-sharm-el-sheikhe.ru/uploads/files/49138296084.pdfIn PDF document text
    • http://grandwatergatehotel.com/upfile_hotel/files/pogosuf.pdfIn PDF document text
    • http://alatasfilms.gr/ILC/img/file/75765616121.pdfIn PDF document text
    • http://vector-food.pl/userfiles/file/1160766534.pdfIn PDF document text
    • http://dokturmice.com/ckfinder/userfiles/files/josagaze.pdfIn PDF document text
    • http://www.enjoyvaltellina.it/admin/ckfinder/userfiles/files/68102388278.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/42503540204.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/sevigesakalevunumaxarasor.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jjqvjeke5nrub24b8qce63lc84/82949035320.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/zefuw.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/dhr7sheojpabh3ki88qln36sh9/gepilamanofegat.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/dopijase.pdfIn PDF document text
    • https://megatekspb.ru/sites/default/files/uploads/gajijobulipi.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d56f0645---8424364995.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/latirebas.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/83614967162.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/21301192766.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4ab9bbf32---morobuvevezulorubunoxe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/39005340997.pdfIn PDF document text
    • http://fitsiluet.cz/data/file/nozusifigo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=watch+sports+free+websitePDF 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_off0000b617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB617 10648 bytes
SHA-256: e929c9a8c892ac997c128a06f1f0f539a87bd9d7ec20fc604f32401caedfd5bb
font_01_sfnt_off0000ce7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE7E 16448 bytes
SHA-256: 6a4edc4a3ef39f01e286b3e7c976e37397dda18330f95ae6cf8b6d6d2fd95f5e
font_02_sfnt_off0000f912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF912 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1