Malicious PDF — malware analysis report

Static analysis result for SHA-256 50e7394b43182849…

MALICIOUS

PDF

96.4 KB Created: 2021-09-07 15:01:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 140299f7b8168ae80d78cb399ee05b2d SHA-1: 2eea24727724206afb4ddf082b6d9a1553ea799f SHA-256: 50e7394b431828497abba95a2025e37f681fe749bfe1afbb1a31484e25fe2522
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing to multiple domains, many of which are hosted on compromised CMS upload storage. ClamAV and ML classifiers identified this file as malicious, specifically a phishing trojan. The presence of numerous links and the nature of the hosting suggest an attempt to lure users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://fashioncenterpoint.com/wp-content/plugins/super-forms/uploads/php/files/aeaaef01606a3f7a10ae01462e7728d3/tovapozav.pdf In PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608770c0cc32a---rikunar.pdfIn PDF document text
    • https://www.nstoplana.rs/ckfinder/userfiles/files/43632147579.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/xexobisetuzajo.pdfIn PDF document text
    • http://addisonplaza.abwingsmd.com/uploads/files/52397360295.pdfIn PDF document text
    • http://chamdure.com/DATA/files/bipolujibuxem.pdfIn PDF document text
    • http://chothuexehochiminh.com/userfiles/file/fodanakikejo.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/13655681235.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/95343274850.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/2704980289.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062908552773499.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/20625586686.pdfIn PDF document text
    • http://assistance.uz/images/shared/file/76288832139.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9afc02240262a1430426b3eeb57c0ba4/77972976159.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/sisatesoguvimepuwivo.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/powal.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/pazip.pdfIn PDF document text
    • http://mazraeir.com/images/upload/files/38962622836.pdfIn PDF document text
    • http://ulrike-mayer.de/userfiles/files/55197809236.pdfIn PDF document text
    • https://pousadamarazul.tur.br/wp-content/plugins/formcraft/file-upload/server/content/files/16081c153c757d---juzuniforusejuxo.pdfIn PDF document text
    • https://www.aironface.com/wp-content/plugins/super-forms/uploads/php/files/1cff182e65377ae6dd82721d196dcfe7/80953829421.pdfIn PDF document text
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/afe24573ea54017b8154107952b22dc3/rurevujovaxinadomi.pdfIn PDF document text
    • https://leise.ru/admin/ckfinder/userfiles/files/kilutafusekunalol.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/c593c67139dc6b14c58017220aef17e7/33378617354.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608425574b254---12318024752.pdfIn PDF document text
    • http://permanentnimakeup-brno.cz/userfiles/files/pudowofisezilul.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=napoleon+book+pdfPDF 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_off0001131b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1131B 18896 bytes
SHA-256: 6fcdec97d81758c425c8d71b0320b28d2f704c491ab04e4f9f6a110052d7b212
font_01_sfnt_off000144ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144AC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15CC3 10240 bytes
SHA-256: daa051dd7730d4d57f075fbb7fc022657b27b958f5304f2edddae771255e66ac