Malicious PDF — malware analysis report

Static analysis result for SHA-256 83258a508829ee0f…

MALICIOUS

PDF

92.9 KB Created: 2021-08-06 03:34:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 15fb0e2148a5137644b82b5974ffbefa SHA-1: dfaef0d93e074287039e05a1197c542837c9414a SHA-256: 83258a508829ee0f2f69d45962975d4e61feb14c28acdb5c5d7739b170246fcd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a specific ClamAV detection for 'Pdf.Phishing.Trojan'. The file contains numerous external URIs and is identified as a link farm hosted on compromised WordPress upload storage, suggesting it is designed to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://laborke.ru/uplcv?utm_term=chocobo+feeding+guide+ffxiv PDF link annotation
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160cc586a3c995---39673426525.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///69115668335.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd9c2bb7d7---vudugijupesasedoxiraporo.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/bolekugor.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094366c7a231---82854110484.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/86956704398.pdfIn PDF document text
    • http://adria-ex.com/images/blog//file/41500089853.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac92127c78f---95106661890.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607e526518959---pidegul.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4044961a7---jifilerir.pdfIn PDF document text
    • http://english-life.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16076225aa0993---62435288648.pdfIn PDF document text
    • http://www.dereformasenalicante.com/archivos/files/jetifazuronugetamawo.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k2j2u2t0qbj6q7enbiopu0bce0/xamepepozar.pdfIn PDF document text
    • http://www.insurancedirectcanada.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160f73be974e51---sisazomavininajagili.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/83462671339.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/793e0713e3f0ccd5759ce79b7e626e29/29099408946.pdfIn PDF document text
    • http://dekogard.net/deko/veri/_files/67543840745.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a7d1aac83---31914027738.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/bewex.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/43280960268.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/njg80t8lc63ccrpiigpsdpsjp5/833468842.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160927c88769fa---94053878088.pdfIn PDF document text
    • http://hf1968.com/clients/48820/File/xoxiv.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/bevadiginuten.pdfIn PDF document text
    • 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_off00010474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10474 17888 bytes
SHA-256: 4cb93c385b552a0f5347a7a6807cf101d1785a832c0cdc4cc1967ef0486721eb
font_01_sfnt_off000132ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014b05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B05 10620 bytes
SHA-256: 684980fd061a39fb0eba835f429cc6766adf4f1457ff2e13911755ce8f1d8e9f

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