Malicious PDF — malware analysis report

Static analysis result for SHA-256 a827f39283ca83b5…

MALICIOUS

PDF

81.2 KB Created: 2021-08-29 00:35:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d345c3624a64caafb48823482b93a8ee SHA-1: b4de43614e8fb9c618fd87a51337c9d07acdad1a SHA-256: a827f39283ca83b5ea53640d941ce70264e7d8cf8722619a5d662eecc494ec3f
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for malicious PDFs. Heuristics indicate it functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS uploads or disposable domains. This suggests an attempt to obscure the final malicious destination, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/da4f66a8efe07e42933517810a045b1e/vuvuwaxarurudixozuzaruk.pdf In PDF document text
    • http://faradbox.pl/files/file/85394832505.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/83578765276.pdfIn PDF document text
    • https://esz.jp/img/editor/files/sekarupuvuminumuzas.pdfIn PDF document text
    • http://jgweld18.com/UploadFile/file/20210821035946286.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f783f649bea37352cb6d521094c6634f/fonopa.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16082af8a0109c---91102821694.pdfIn PDF document text
    • https://kultmotor.hu/images/files/xamibemepakidifepusuzaliv.pdfIn PDF document text
    • http://eldmsh1.ru/js/ckfinder/userfiles/files/bejadelu.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/gumoxosaj.pdfIn PDF document text
    • http://activesolutionelectric.com/images/file/tuvuwulogebasakovos.pdfIn PDF document text
    • http://dush-kz.ru/uploads/fck/file/zomusixazo.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b86bcecf5fc---kapedipubimupalaw.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f943acac0c---benowiri.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/fa74b1fdf2b58152be5cf132d9a45dfa/doverap.pdfIn PDF document text
    • http://wagnerpc.com/userfiles/files/nawomogumilogatonizetapa.pdfIn PDF document text
    • http://irina-beha.com/ckfinder/userfiles/files/21615567731.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/85725584182.pdfIn PDF document text
    • http://talk200.com/admin/admin/uploadfiles/file/97689741350.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fff49d388---kogadafudugabem.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/67614435943.pdfIn PDF document text
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d4eb5c86cc---12185260919.pdfIn PDF document text
    • http://acrclubinversores.com/files/galeria/files/4106502647.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f921d6c9f0---fabikikiw.pdfIn PDF document text
    • http://nhanvietgroup.com/demo/xay-dung-tnx/upload/files/69215573427.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dd8e5b4693a---46317931517.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=skin+inflammation+causesPDF 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_off0000da7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA7F 10664 bytes
SHA-256: e5e8d9d43c44416aebc0d612edc6010253eae3699b9d5699b2308ba12b7c75c3
font_01_sfnt_off0000f2ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2ED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010aff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFF 16868 bytes
SHA-256: beaf13021a3a60a4ebbfb41c7b73b6af81535644d25b62f2069245cdc1bf40bd

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