Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9e0550349ac1668…

MALICIOUS

PDF

70.1 KB Created: 2021-06-02 01:34:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d40d1de5c05fceb8bf99df92a3a12d7 SHA-1: c864e2b182d1ea66ca0e98e06591a8b804746439 SHA-256: b9e0550349ac166860ff93edffea0a6d6faea010554e988619eb1d2c11af923d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous links to compromised websites and uses SEO tactics to appear as a legitimate download, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9876

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/86fdc0955c1fef54457e7bb92a2a3bb6/kezuvemugof.pdf
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa60b048397---genobem.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/cc25ddf97bf8e2fc3cf424b065594b8d/84546732024.pdf
    • http://fructusartis.com/i/File/57046722113.pdf
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/6l9ut7pq1f9t6q0p1cu4dgh3m5/26458405845.pdf
    • http://coming-c.com/userfiles/file/kovaxoxosulavikirifoti.pdf
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/jonefep.pdf
    • https://binarbaid.com/public_html/userfiles/file/87970683372.pdf
    • http://www.cafeinca.com/img/public/contenido/file/63005530281.pdf
    • http://wagnerpc.com/userfiles/files/16419763535.pdf
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160705a0430946---97456714234.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/60280597252.pdf
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/8e5dd3be92bd7941543ef88ded070de4/86949919862.pdf
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b381891bde---bonidonudujilopedaru.pdf
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/ghpi3v7mg9n17prdu031lo3r95/refovokupukojugamo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=herschel+walker+basic+training+pdf+free+download
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d1f1.bin
80778daec1cf17ddb037651b269c1cdb0760047c892ad8db577c678ddbf10442		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD1F1 5460 bytes
font_01_sfnt_off0000e47b.bin
04344ca10b0e219d10385e932f457c4cfa4aafbc6951b91936ae5dac083ce689		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 10812 bytes
font_02_sfnt_off00010946.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10946 4324 bytes

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