Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c083355f719da4a…

MALICIOUS

PDF

65.6 KB Created: 2021-09-25 15:56:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 62931d0f25f7a766c47c569c11e06a05 SHA-1: 3f470eb4a05e1966ed21cac4a9f342e846950583 SHA-256: 6c083355f719da4a82d4280d1b1758feeff938fbd402f889d3e63d450c62f03a
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file functions as a link farm, containing numerous URLs that redirect to other sites. The ClamAV detection 'Pdf.Phishing.Trojan-d2568dad23a94d95' and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate a phishing or malware distribution intent. While no scripts were directly extracted, the nature of the link farm suggests it's part of a larger attack chain, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4138

Heuristics 5

  • 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
  • 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://atputasbazes.lv/images/userfiles/files/915394880.pdf In PDF document text
    • https://www.weldcor.ca/public/ckfinder/userfiles/files/najopap.pdfIn PDF document text
    • https://autotronics.vn/userfiles/file/15008046252.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/13383947106.pdfIn PDF document text
    • http://timebymtm.com/upload/files/8331801197.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/78649959703.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161340b2dbb51d---titerorukemexumi.pdfIn PDF document text
    • http://rkenterprisesonline.com/FCKeditor/file/disipu.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/kijamigux.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/89375555787.pdfIn PDF document text
    • https://nezamirekhaseafoods.com/userfiles/file/26870806819.pdfIn PDF document text
    • http://sro52.ru/uploads/files/13001832773.pdfIn PDF document text
    • https://kawanmto.net/contents/files/xeviwetawulixoruk.pdfIn PDF document text
    • http://urparitet.ru/admin/ckfinder/userfiles/files/87889496555.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/78877703932.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/coee2jfls22e53d19aclthjj02/77514868132.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/nuvudigeredisutisavur.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/ledoripelikebozut.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/nopimorofesere.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/47ab6728b37b6b300d81a372b72dca76/zosoxipepa.pdfIn PDF document text
    • https://polresseluma.com/assets/ckfinder/core/connector/php/uploads/files/vunizugekefavogasowuzo.pdfIn PDF document text
    • http://lateonsettay-sachs.org/userfiles/file/39739631842.pdfIn PDF document text
    • http://filipdegreef.be/uploads/files/65481402126.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=stream+from+android+to+kodiPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b33b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33B 17060 bytes
SHA-256: a9050564dee9e66da8d53fe3ee60810d7e0ecc54cb24d96780c7051773c90152
font_01_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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