Malicious PDF — malware analysis report

Static analysis result for SHA-256 25fa72ff0b7d9fd8…

MALICIOUS

PDF

92.5 KB Created: 2021-06-30 05:18:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 8c29d8b87d36a0c46e6548c85397537c SHA-1: ed499f0a8ebf4a4a0803d8f8b6bd30c6b77dcad5 SHA-256: 25fa72ff0b7d9fd882393545b6d48b488642a5030bf30f4cdfed03d91686745e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the link farm and the 'Pdf.Phishing.Trojan' detection point to a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/e8c8b9ed860039efc31e0c738b93f188/favutinigejolizular.pdf In PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/au8nf5p5m853rvap0bb9ng564j/83567176037.pdfIn PDF document text
    • https://carea2plus.com/wp-content/plugins/super-forms/uploads/php/files/4de4426f4409ed83604d6d35f234fc33/rusuketanijobufabizovud.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/b7a7aba9708264baaa57f85d6ef8883b/47557934680.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606d22f7c8337---30270621904.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/82a4e61c9161c06d8d5c5093e09e4c95/3567714567.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/afq8fmbdi2o6mv9ckeqf83qsqn/66146241693.pdfIn PDF document text
    • https://transit-connection.com/userfiles/files/gutokupeludaxat.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/72948498016.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/f9f037be4c5c2cabaff97dd9825c5d4c/bageredovekopilawaxuvok.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0de3817ff718a908f55fec33817fa46b/basefisozanusiwoku.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a975023e6a9---rukesudelibanesuduwutater.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/xabefuxobigezupolojepimet.pdfIn PDF document text
    • http://johndanton.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70968265497.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160850b4ad5237---86384488343.pdfIn PDF document text
    • http://secretinvitation.net/images/files/wonuguri.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/witadivet.pdfIn PDF document text
    • http://womenwhorockarkansas.com/clients/4/4c/4cfcdabbb7b8ad81bafe9a4295858145/File/94300379392.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1608611f86464b---xetejiroboxujivuvodabal.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160b976c2dd570---67704973293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=speed+of+sound+frequency+and+wavelengthPDF 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_off00010202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10202 11396 bytes
SHA-256: 6babefb61ffacc4f4b4dac4c54ec11cc5f4a0de21492d976bf755db4f188961b
font_01_sfnt_off00011c70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C70 18180 bytes
SHA-256: 1d36c3950b836af422ae9e0c791adce8ddc106c3c4fb374639cf1bade950d400
font_02_sfnt_off00014cdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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