Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5da7745e7c60e82…

MALICIOUS

PDF

76.8 KB Created: 2021-09-07 11:29:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1496a6fe87bef81b35f0ba7865dff26d SHA-1: 3990e28771c7b8ff238a8b6c9314b2d45fc6c553 SHA-256: a5da7745e7c60e8246a2746eda26bd3577df5bbad3e0211299c045db6d7fb402
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many pointing to compromised WordPress sites, suggesting a link farm designed to distribute phishing content or malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous URLs are indicative of a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://chcial.ru/uplcv?utm_term=trainingsplan+abnehmen+frauen+pdf PDF link annotation
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4f081a972---14307392127.pdfIn PDF document text
    • http://lindseyderence.com/userfiles/files/78713544446.pdfIn PDF document text
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608656fc17402---kafabuzarujuzaze.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608fcde39d03c---65065105578.pdfIn PDF document text
    • http://cnkls.com/userfiles/file/1627706955.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/zamisumuriwedemixogo.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bd1e68467---47857432689.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/5df1130a8f97be37aa71a0c69c42ce43/ximosudugulomajuzemepufip.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/jonukazetalotuzaba.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/nexufawadotiwakigixol.pdfIn PDF document text
    • https://securityguardsupply.com/php/uploads/file/34460479668.pdfIn PDF document text
    • https://securityguardsupply.org/php/uploads/file/norupirake.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160e1654012c35---rimonuv.pdfIn PDF document text
    • http://studiotrusso.it/userfiles/files/jemadodafiwoja.pdfIn PDF document text
    • https://8foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/65900083241.pdfIn PDF document text
    • http://prime-standard.com/piceditor/file/22286364700.pdfIn PDF document text
    • https://parc-hotel.info/file/23921276598.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/2mj21rgp7lek1b5nhue0v9je14/73837822139.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/59867546234.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/e070741674112c2876d11c68fba367c7/limemokivebejizefekub.pdfIn PDF document text
    • http://jia-longsofa.com/uploadpic/jialong151126/files/202108240753584107.pdfIn PDF document text
    • http://guitarenko.fr/img/files/botetometonetikema.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a440ca56ee5---lanoxaterivob.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/dufusipifagezujozibiliji.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/99196996759.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/go3nbil7l64eujjnvvnphgpui8/99239052400.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_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 17896 bytes
SHA-256: 5ce40c2066bfe553e2ad691be071c5869a493b8dae72d66c60c014b2ab097d4f
font_02_sfnt_off00010cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CF4 10932 bytes
SHA-256: 6335fd609bff9dfed38f5158586c9b64f8444cca1d64dca660a3a13accd69813

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