Malicious PDF — malware analysis report

Static analysis result for SHA-256 a973b3c87e751bd3…

MALICIOUS

PDF

81.5 KB Created: 2021-09-18 09:11:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 98bcd45773557cbeb81cb2f1dc11592e SHA-1: f450b0a81cc7989a680b1c669a88b2a8acdaa097 SHA-256: a973b3c87e751bd3f93715aaeb765e1ad522354d7670d61a72901cafcdf76feb
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. Heuristics identified it as a link farm, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest it's designed to redirect users to malicious content.

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 https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161406d5a3c546---65728617117.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1612f3e2438996---31052388358.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/46129251282.pdfIn PDF document text
    • http://saovietgroup.com/upload/FCK/file/fikedev.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/23970961165.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/64792048519.pdfIn PDF document text
    • http://www.galiantsolutions.com/emailimages/file/88377865933.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/likamisobelevutotexufaba.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141dabed17c5---jukiwunotuji.pdfIn PDF document text
    • https://mentormedya.com/files/66925870757.pdfIn PDF document text
    • http://087334211.kad.tw/kads/ckfinder/userfiles/files/69288447815.pdfIn PDF document text
    • http://robertfeinberglaw.com/images/edit_images/file/zaxonejanajotat.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/82452788443.pdfIn PDF document text
    • https://ciiinnovationsummit.com/ci/userfiles/files/xabejos.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/27216538537.pdfIn PDF document text
    • http://candientuvibra.com/images/file/fesirel.pdfIn PDF document text
    • http://thaimassagemodel.com/ckfinder/userfiles/files/nuvukaxaxidugarunukelunat.pdfIn PDF document text
    • https://mai-avto.ru/upload_files/file/82540464742.pdfIn PDF document text
    • https://tutorsbureau.net/userfiles/file/femasoruzozok.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/satowimo.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/76003572662.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///tisudemeteselopa.pdfIn PDF document text
    • http://hichipper.com/hichipper/uploadfile/file/2021091716593373499.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210902085404.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=what+is+redmi+recovery+3.0PDF 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_off0000d421.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD421 19560 bytes
SHA-256: dd8e9a61f685cb39844e5fca3d22695d78149c2386a65f01d3ab2123d3aaeef0
font_01_sfnt_off000106dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DD 11016 bytes
SHA-256: 2979e01973e55a9fc551e7584095ae84b93eeaa9980ec01d01c4e3b92a270906
font_02_sfnt_off000120a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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