Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5f32de944dc01ce…

MALICIOUS

PDF

178.7 KB Created: 2021-07-23 15:49:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e5dfc12e9e8d47d4665a33daacb6a970 SHA-1: 003b74419a368b8c763ec0ae2d7b9961a4015187 SHA-256: c5f32de944dc01cef6c46b0995245d3d5f11be19d331bc7cd18aae2faab91499
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9714

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://robinio.de/wp-content/plugins/super-forms/uploads/php/files/sabc0m64bbkm4g4kfvgpfn12r5/sokomi.pdf In PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/d5935b9e744a8bdc029cc1bd4d2641ed/96956376107.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/32250232748.pdfIn PDF document text
    • https://growyourmoney.in/userfiles/files/32912637974.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/476447c13e6d49a7ecb1a4c2c944e10f/nobagirapurexalosutipon.pdfIn PDF document text
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/71398472479.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a98ae70e558---19367877792.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/54742037794.pdfIn PDF document text
    • http://fewo-spreewald-schoetzigk.de/brandenburgtag/img/editor/file/vinawajokurujadelu.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f845f162c0---52209120622.pdfIn PDF document text
    • http://sns.hu/_user/file/11442337189.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160d30c769e210---76123242595.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/2568504580.pdfIn PDF document text
    • https://mudateconmigo.cl/wp-content/plugins/super-forms/uploads/php/files/762bcebc25203b8d4360e5a560a50e30/9148511566.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b95ad2fdf4---19965590213.pdfIn PDF document text
    • http://liveranigioielli.it/userfiles/files/85353499908.pdfIn PDF document text
    • http://capthepcongtrinh.com/uploads/news/files/rupolorurubak.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202105/file/nipafasepuxasiw.pdfIn PDF document text
    • http://cpspcb.com/uploads/files/36519843216.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/c59b5bbfdc8098c5c0364c70ca7e02b2/88474720771.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/93972496328.pdfIn PDF document text
    • https://vinisfarm.com/wp-content/plugins/super-forms/uploads/php/files/bd72a76ef85b544eb739773041f0954d/77321548634.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/7c84128454624753cd04dd45009c2883/86665067983.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=orwell+1984+pdf+espa%C3%A3%C2%B1platsPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00021d36.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x21D36 35492 bytes
SHA-256: 28244e60c0fc24e28f55603bad691cf316c7b90870b5b7ed4aeb7768ca1d9325
font_01_sfnt_off00025a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x25A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00027221.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x27221 11124 bytes
SHA-256: 2d32c727ec9ca1f4624724f01b9fa679b125508c6969c71437ad9cbbd70f5075
font_03_sfnt_off00028c1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C1C 17600 bytes
SHA-256: 2f8e006e467969ccdb91390d739bf00e663ca9674838b7fd92cdb9913bebaf98

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