Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f719edd0ddf0d03…

MALICIOUS

PDF

88.4 KB Created: 2021-09-06 13:08:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ea845d56af06aa4796f8e91066591c5f SHA-1: 53aade200f914db1b8d5a4692bc480058cd5b139 SHA-256: 5f719edd0ddf0d03190f58d038e5447f65e4726ae113762c8901bc29cbd54b66
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate a phishing or trojan payload delivery mechanism. The document's structure and embedded URLs align with common tactics for distributing malware or leading users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://infrive.ru/uplcv?utm_term=divine+mercy+novena+prayers+pdf PDF link annotation
    • http://senn1962reunion.com/clients/2/2f/2fc2c703930c5c120d54ce0350dd22c7/File/1770413387.pdfIn PDF document text
    • https://mama-light.net/business_school/uploads/file/67890314335.pdfIn PDF document text
    • https://krassimirtaskov.com/userfiles/files/29001723230.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/69199e5090a491924b83e0f110b1aa24/wanarobelefuba.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/fb1c6ec43ab3d1e91810f6fdfdc36e07/34094120927.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/44108345392.pdfIn PDF document text
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/budozedilewepozu.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/22425854910.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/fulirem.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/1fb67fbe5ccc1630849918b151d43bf8/lutosozolutefebafirajub.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/rawazulaw.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d548255413---51761416376.pdfIn PDF document text
    • http://z-i-f.ru/userfiles/file/momugisomukijoxogif.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16110886b8a195---85140378534.pdfIn PDF document text
    • https://chefinhogourmet.com/wp-content/plugins/super-forms/uploads/php/files/1b74c0509a500f6f5d404bcd47733ca7/71746110694.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081117b3a971---tategexebadutir.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/014148ef0b7102a306122d440bfe8f9b/jatosonogalufijenu.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/bukobivufologebavonogowef.pdfIn PDF document text
    • http://belv.ru/userfiles/file/79258535427.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bc7433bf494---pexobora.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/93899479783.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086ce48aa6fa---13594625651.pdfIn PDF document text
    • http://aep-tc.com/cache/fck_files/file/kubadapimunexadeja.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/pemetisori.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_off0000f09a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF09A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000108ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AC 19140 bytes
SHA-256: 9fb794358ccb53eb50f41504aecbe92381087e17ca782da60decdf5ee8cce54c
font_02_sfnt_off00013ad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD1 10816 bytes
SHA-256: 9f9d8f68b7254ca8e1f5eb914c1e88c934844ff81e762e79c0db2220f8ef6a8f