Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9527a5e6bb32522…

MALICIOUS

PDF

87.9 KB Created: 2021-07-20 03:15:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f121efabf414207f81a4a1cb9632fd6a SHA-1: c83360911efe78430e3c5799590489a6639a22d0 SHA-256: f9527a5e6bb325225d00d7f815ba36f89fd3980f1f8d2b215fdd37a7f93cf0f3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload directories, likely intended to host and distribute further malicious content. The document body is unreadable, but the heuristic firings strongly suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608462f9ef2ed---dozurefujojobibu.pdf In PDF document text
    • http://cameragiaminh.com/upload/files/3910750581.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d6f6e932670---wijozakifixugerovavorusi.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/896e9f9327859dc046c2734548c8d4b5/86348344868.pdfIn PDF document text
    • http://jyotiacademicpress.org/uploads/file/wuxuwidigutoxukowus.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc965429de---67006442559.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/40371538068.pdfIn PDF document text
    • https://oliogalanis.com/file/87362928154.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/59683340348.pdfIn PDF document text
    • http://bahattinburyan.com/userfiles/file/82822820991.pdfIn PDF document text
    • http://asianaccounting.com/admin/fckeditor/userfiles/file/86151212201.pdfIn PDF document text
    • http://hotelstrack.com/bot/ckfinder/uf/files/kobasozivubekabi.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/ripekumukanena.pdfIn PDF document text
    • http://charugarware.com/DEVELOPMENT/charu_garware/uploaded/userfiles/file/75201910937.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607a997877d6e---78124491909.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cdf7a649503---dejedevasokese.pdfIn PDF document text
    • https://eqonetech.com/upload/userfiles/files/30471884444.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7369b259b9---25506292965.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/719cfd1a6f5d04baf3631cfbd1ec302b/zifosofonulakon.pdfIn PDF document text
    • https://flexrocksrollovers.com/wp-content/plugins/super-forms/uploads/php/files/etto5s683n171ff9k4seru8p2h/20352069064.pdfIn PDF document text
    • https://krippner-schroth.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074a4fe462cc---94887996133.pdfIn PDF document text
    • https://jnfarley.com/wp-content/plugins/super-forms/uploads/php/files/jci67kmng2sor3h2qqd5ascf51/wutuworavijokinu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=use+invocation+in+a+sentencePDF 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_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4F 17360 bytes
SHA-256: ef32838721a4785bded63966a7890ed0928841ca31eb5d615d116ea2453bc43b
font_02_sfnt_off00013bb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB9 10152 bytes
SHA-256: a7c0a9f3e184d8f89b365cdbfb2ecc5f12a92c2628e3c2a2e2a7307241010af1

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