Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3e4fa9c45675009…

MALICIOUS

PDF

83.3 KB Created: 2021-09-03 22:54:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: deb7cfd20be3522a4b700ae656ed9af3 SHA-1: 01ae71d3faecf5d6abdfef0c7b0510b3cfb67958 SHA-256: c3e4fa9c45675009eb5f1b4a9bbd09373f370e8ce9e4ae33aeca8b8b75066a01
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to potentially compromised websites and disposable hosting, indicative of a link farm used for malicious redirection. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware distribution. The document body is heavily obfuscated and unreadable, providing no direct clues to its purpose beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://cecev.com/stockages/files/22272581047.pdf In PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/liwepudetoloxutuzi.pdfIn PDF document text
    • https://www.d-table.com/wp-content/plugins/super-forms/uploads/php/files/64fcb263f912bbde0ed4b9c27bd53606/biwaferuferiregudolaxuzap.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/nanuwejopog.pdfIn PDF document text
    • http://aldo-ins.com/userfiles/file/wirem.pdfIn PDF document text
    • https://martensmgt.com/business_school/uploads/file/kejinatedukokebaja.pdfIn PDF document text
    • http://issaproject.com/app/views/panel/ckfinder/userfiles/files/sakitulivez.pdfIn PDF document text
    • http://yuli-china.ru/d/files/xokekus.pdfIn PDF document text
    • http://cn-polylysine.com/d/files/zedemerok.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/0366e546b8a3bebb89158f4d0314f4c5/mezukavibogu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860060219eb---92450953791.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/devonewemasot.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/tc3919nt7ajludahcck2gpldl2/83393546777.pdfIn PDF document text
    • http://airsoft1.ro/files/file/rubururomixatuju.pdfIn PDF document text
    • http://ordinate-ltd.com/file_media/file_image/file/44115840762.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/aee6211f192bbcc51fb291ccf3e39dc0/85782336426.pdfIn PDF document text
    • http://coumert.com/images/file/zonugefulukalijo.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/wiwegoboperupi.pdfIn PDF document text
    • http://tubelessons.net/cms_images/file/pemotu.pdfIn PDF document text
    • https://groupburuemas1.com/contents//files/judilesuvezop.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/wikepob.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e89da2fc9---titipux.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/sulamuboxirenu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=thailand+visa+on+arrival+application+form+2019+pdfPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/3c338078cc3fff54f45ee72bdd2f69c3/43317467935.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_off0000e0d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0D2 11244 bytes
SHA-256: f9cf9ec496c8d1c30446d378bf642eb18061284f3bb87b16a2b1bb8ad25d64e6
font_01_sfnt_off0000fb06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB06 17176 bytes
SHA-256: 7f363d02dc6998c29aed3f1a2cdbf4fc218d49a9ac5b79b03cd8c9185c84932e
font_02_sfnt_off00012742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12742 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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