Malicious PDF — malware analysis report

Static analysis result for SHA-256 c79242f193684710…

MALICIOUS

PDF

91.7 KB Created: 2021-07-08 12:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 9ff0c0c5c50cec710405ababbc83b0f5 SHA-1: c06e458bd7c94bde21c3c3d194230f3afe2e85d3 SHA-256: c79242f193684710e04276c606a9f4b14a26bbb35af6256ae31e2a3a2b93a3ed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, with many pointing to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc2889ae40a---83759016065.pdf In PDF document text
    • https://classconnbio.com/img-jacson/files/79466241486.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/vawuruxufi.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/10919364387568549d4aba5988326d7d/koxadivoge.pdfIn PDF document text
    • http://bukharageorgia.com/sites/default/files/file/18529919652.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076c8847afb2---wereziril.pdfIn PDF document text
    • https://aartipalette.com/userfiles/file/99723807137.pdfIn PDF document text
    • http://qbcar.ru/ckfinder/userfiles/files/gegixevuwe.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3f327ca3f---wunekowilidegunofowir.pdfIn PDF document text
    • http://kidneytexas.org/clients/861060/File/rirosubopobaxadujerifoni.pdfIn PDF document text
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c586b569418---45517292553.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/e1c4dc87eb686a9890c43f430f470043/1504509550.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606ffef15e3d7---1880145398.pdfIn PDF document text
    • https://whitelightdesign.com/wp-content/plugins/super-forms/uploads/php/files/526513278c4176d80f8f9630e06a4478/gebosefugitomupepev.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/amld5jnjnefk9ci4mvmucud4vk/nupawep.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bd54de95b52---guzadanavud.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/1rciv7rg8ip050nhfrtjqn107v/dedufasejaxetojagemekize.pdfIn PDF document text
    • https://cspdental.com/wp-content/plugins/super-forms/uploads/php/files/c5d95b4bd2456d0f6977812121502471/xekujimitokeparakopasewa.pdfIn PDF document text
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/60bc886496bc325d0f16a10b1123e16a/wafisugisasawisiregovajez.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7fefb3a28d---51151414144.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/18fda72efbccb1c664200c3a4ec3b4c4/9913029281.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/24528484032.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/zigudekevuzunip.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=best+fps+games+for+ipadPDF 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_off000102be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ad5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD5 10744 bytes
SHA-256: d5dd3dd1f4a933a4492588cb6a2d5be39b1bfde5b20827fb00f39426a5641d1a
font_02_sfnt_off00013368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13368 17756 bytes
SHA-256: dcda9caaade9341e7ef5645519614afa74f507c678bf283be1cac9d8aa8d3fcb

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