Malicious PDF — malware analysis report

Static analysis result for SHA-256 2663180537bcb538…

MALICIOUS

PDF

117.0 KB Created: 2021-06-27 09:07:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 3cb1f656ab815195a25ebd5999610e2e SHA-1: 091d04f597ad80488a8e08b7c6d00bb0d6c39378 SHA-256: 2663180537bcb538c9f7403b39d15079a832c59311893142cfc0375e02e53b08
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress upload storage locations and other disposable hosting sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9688

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 http://hasyo.net/files/file/gaberurifamowisofuvud.pdf In PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af61b23d1b8---guleput.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160847c1161b23---pivepasotomuluretafux.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e293bd2d9f---xaxuvijesivij.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/160acb9bc07a1d---xuvegimaridejegasesoki.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/2vve68qfc970oh1pjcrj6irv9a/69525438254.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/66703005979.pdfIn PDF document text
    • https://www.beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/50326f9c3141eb94a3fb5a9897169ca0/63696712829.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc07c557e7d---dewobavoxodiserivozoki.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/9c8c8adda12a260d5e51526336db35bc/bogixudewefa.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8799a60bb45258a6858da22048ba75c4/36002462450.pdfIn PDF document text
    • http://tragadsonisurat.com/ckfinder/userfiles/files/3266638811.pdfIn PDF document text
    • http://jirehenl.com/userfiles/file/080149422952.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0f5e5b2268---75627882699.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/93503531443.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae8e756fe94---43547767078.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/kafel.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3e98f89d0d---kulosirelanew.pdfIn PDF document text
    • http://lifecare4all.com/upload/files/vibekotatumesuriwakefox.pdfIn PDF document text
    • http://www.afamaresme.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cb1f097b6eb---desinovuwuxoduzidubojeko.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/m66kojc8f7j3o776j3m8fd85p1/10001698814.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/ggsuc9gdsbv3pl113f7qo85u62/39178016007.pdfIn PDF document text
    • http://www.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/9u1pgki46gmnr0tgd8do3vpcj3/gejet.pdfIn PDF document text
    • https://bisnismedsos.com/userfiles/file/56903819049.pdfIn PDF document text
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/56256498080.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=the+old+guard+2020+123moviesPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000132fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132FB 19048 bytes
SHA-256: d0549d6bee9f214ec81396c6db054f47b9a8b16a047ed8c1f6f8fc8fba169f40
font_01_sfnt_off000151f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151F3 20684 bytes
SHA-256: fedc0ec22ce464e018b961e0efc53e55618a44d7cccda5b873dcd02bb9973790
font_02_sfnt_off00018999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18999 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A1B0 11088 bytes
SHA-256: 20c66bc12076d91df89cb98bef95321d78e332da9e5a993282e876d5edc33057
font_04_sfnt_off0001bb71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB71 2268 bytes
SHA-256: ed302a664eed6b94e9dad8211a421daf25ad7d6ff30e174d7bc66c315c10a962

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