Malicious PDF — malware analysis report

Static analysis result for SHA-256 25a1657c86a3a160…

MALICIOUS

PDF

89.8 KB Created: 2021-07-03 15:17:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1db683bd02184b788e24ea37e1b05f81 SHA-1: fb7e3fcbeaa58d61513687c3031e012687386c2a SHA-256: 25a1657c86a3a160407b6599c1d4a95235d58810afd9874ce9798d77c26204ae
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV. It contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS uploads or disposable hosting. The embedded URLs suggest an attempt to direct users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://archism.ru/uplcv?utm_term=fat+lump+on+inner+thigh PDF link annotation
    • http://mousike.it/img_ins/files/kuzisufoduregupimugad.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160757fbe681d1---77556032831.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/56701181727.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/cb9e56202ac9e3d5a5af2111d9d42c0f/falogesen.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/nutumado.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160bab198a9b76---21426846577.pdfIn PDF document text
    • http://hongdanhaudio.com/luutru/files/27781370491.pdfIn PDF document text
    • http://texmet.pl/userimages/file/43014811363.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9036b7e11a---71129380439.pdfIn PDF document text
    • http://sam-global.info/files/file/28704563730.pdfIn PDF document text
    • https://zlato-eu.sk/upload/files/93969302812.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/bateviluruto.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/44183d2637383facf44011711c8b0f56/43735230777.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b007ecc3cad---14342617963.pdfIn PDF document text
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/4pkfhimi5s84sqtanl4rcajle3/68390660183.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/xuboxusagorosadobibogo.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/nepiredurajesibi.pdfIn PDF document text
    • https://reifenscho.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9b4f9a8bb---jirexox.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/97224133439.pdfIn PDF document text
    • http://sevimticaret.net/userfiles/file/vafelalejolisafum.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee6c5a61a0---topip.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160800e3aee40d---82663877017.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDD 10608 bytes
SHA-256: c7f253f1bbae3119a9ec9ef7b928c0931c657beca9ce04839e9c9e22bfe0294f
font_01_sfnt_off000115d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D3 17096 bytes
SHA-256: 184f75e20120ab7448ac7a10c03b4a98eb547e7f931bba2af3b2b9ed7cb64fa4
font_02_sfnt_off00014223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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