Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cc0b73963adcd60…

MALICIOUS

PDF

80.0 KB Created: 2021-09-02 23:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7531cf6721e6e5b5d2e964a043d74ea6 SHA-1: 7c094103dfaa52fdf7bd75aec1fc19a514a5b2d9 SHA-256: 2cc0b73963adcd60d4155fb0ffe7611546074021c277e81f5051a95aa7fb4f4d
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The file's structure and URL patterns align with common tactics for initial access via malicious documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://clicksnepal.grnca.org/img/files/files/96347177120.pdf In PDF document text
    • https://dildendilecevirievi.com/upload/ckfinder/files/xizepekitizuta.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8821cc62c---gopiridepiboxoxijab.pdfIn PDF document text
    • https://unibel.pl/pliki/upload/file/goputatusikuvosuxup.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160fb1cf2acb9d---14677605959.pdfIn PDF document text
    • http://prosquash.by/data/bejazaduwunabedak.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/dujufapum.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160983cbd041a8---29462344991.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085136405cfe---loraposamefoxakeg.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16074d63abdf74---12675870693.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/sategikuvoveto.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/rpc90b0ivt5tcmo6jle1efqot1/lixofuno.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/julajunikikodufipu.pdfIn PDF document text
    • http://frezerovka.by/images/fxeditor/file/87885668117.pdfIn PDF document text
    • https://marigabung.com/contents//files/78327701629.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/zeriniwu.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160cf847bb6247---pabesoseparujegov.pdfIn PDF document text
    • http://tacchigroup.com/public/thread/risorse/file/55587196813.pdfIn PDF document text
    • https://baongochoa.com/upload/file/tupepenabekum.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b5f51310dd0---11909827078.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/nejenijeredesalezul.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c61b2630---vunoperedixipe.pdfIn PDF document text
    • http://www.ccengis.be/applications/ckeditor/addons/ckeditor/ckfinder/userfiles//files/duriforawe.pdfIn PDF document text
    • http://sts-logistika.ru/wp-content/plugins/super-forms/uploads/php/files/09e41884c4261655575b2c39b8c4bf5f/dugowaxi.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/frgm5pdaj8m4p9s15g0a4iks1p/72455591292.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/03cnauq47ke5ja3ce86pu8frm6/gajubewijekeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=statistics+and+probability+pdf+downloadPDF 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_off0000d0cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e8de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8DE 18212 bytes
SHA-256: b815cecdf08043b785b62dbc77e5c5ba911d999b67ec9a7aa686bd645f7d5d44
font_02_sfnt_off00011896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11896 10896 bytes
SHA-256: 51568cb48ba80f160dde4c3458ccbab1e0825564d5294dc47d3c09ba2a910001

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