Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2a3b88d1b0537d…

MALICIOUS

PDF

143.3 KB Created: 2021-06-28 02:35:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: f7c9c082bb8e9f7c7d099f875d9520bc SHA-1: 2a7e01ce04bcac875aca1a3d4959e9dc392b8a7a SHA-256: ca2a3b88d1b0537db3e2e27d0bb5de5539fe653f5d233db71e6f8390e6f47de8
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or redirection campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9680

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://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/622d07c1ba95bd45c0c23c6c606f15cf/43839353876.pdf In PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/7e768e97fce155ac7388b3e8d9e62b28/52916735589.pdfIn PDF document text
    • https://catbasailing.com/upload/fck/file/98067426306.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/rutowob.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e82deeff4a---fojav.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a7429030843---napagizadobib.pdfIn PDF document text
    • http://www.publicitymailing.ie/wp-content/plugins/formcraft/file-upload/server/content/files/1607bb6a21e7ca---fabov.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160807aa0c2d1d---dimatelejesawejebopen.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/72664581140.pdfIn PDF document text
    • https://ilc.ua/wp-content/plugins/super-forms/uploads/php/files/0410qj8228cpcn5ofqrub4qvo6/kukoxedux.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/famivelexezaluwemoromofu.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/21d85c8bd14db9634206fd1b5643b70f/49973807995.pdfIn PDF document text
    • http://hauptlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29223299829.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/160760beb1aa37---1485097771.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/ju7vq96pf64s392i6f7m6ujte5/bivoto.pdfIn PDF document text
    • http://ampletrekking.com/userfiles/file/86536258895.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071fe8e4fead---62537879058.pdfIn PDF document text
    • https://reflexlighting.com/wp-content/plugins/super-forms/uploads/php/files/7cf8349cc08ca4680bada528e94dfe1e/38010142496.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2b6863c5b---fefor.pdfIn PDF document text
    • https://tirthmobile.com/wp-content/plugins/super-forms/uploads/php/files/v8nsrrsilorkn49oera5ikg40b/patowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=reference+in+meaningPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001bec5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1BEC5 30656 bytes
SHA-256: 69fee0ca5001adaae0c58912a56acb172f04970c536530bc449f3a821af5cfa2
font_00_sfnt_off000141c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C9 34828 bytes
SHA-256: 1ffe2467a22e75297be6d1102eb8a553d9cfaf06d9b577b2dab3d8d676544176
font_01_sfnt_off00018f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18F93 10292 bytes
SHA-256: 7ee1b1dcd930d685c0948be03645391babae3ed9aab0c8d9d45fd9bd8ef3f678
font_02_sfnt_off0001a6b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A6B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off0001f8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8F9 18208 bytes
SHA-256: 2c471fe8d29ccf7cbdfe1d0d6f27b89fb6c771e1ee8ea2ce37d96e7f0ea545f1

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