Malicious PDF — malware analysis report

Static analysis result for SHA-256 91c5bfbfb6435861…

MALICIOUS

PDF

71.6 KB Created: 2021-09-18 21:04:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b077a1783fe240920f4b7542ad3249d9 SHA-1: e124f4af6726827676473897d88c358bae2bd273 SHA-256: 91c5bfbfb64358611e991e95f073ac71fcfdc53e47392c011a04b17e57a69ddd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, directing users to potentially compromised or malicious websites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pistant.ru/uplcv?utm_term=words+with+x+and+u+in+them PDF link annotation
    • http://vngo-cc.vn/cooker/public/files/57635883625.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/budulidalenasi.pdfIn PDF document text
    • https://madame-tina.com/ckfinder/userfiles/files/50061578173.pdfIn PDF document text
    • https://parlagame.com/calisma2/files/uploads/89208526558.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1613ffb3c92198---27802139843.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/26849432961.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/56958992742.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161390dd8511e2---tamigigitaxupowuno.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/worolulimininopufipuxa.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/kominuzesikubakele.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/dasaseg.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/h1ckckkls20dot87nmjiif0tsr/muxojake.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614207e2f069d---40464139590.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16135448b531c2---kopukufupisox.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f526abecd8---38677489044.pdfIn PDF document text
    • http://gramercy-grand.ru/files/file/wigupa.pdfIn PDF document text
    • https://vwb.mrv-educationservices.com/content_file/files/90168747494.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905180225.pdfIn PDF document text
    • http://dragonspond.com/uploads/files/fenuduzatitoladiginip.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/kijote.pdfIn PDF document text
    • http://elliptical-trainers.ru/ckfinder/userfiles/files/perakadijit.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137e2fd28d48---71241990766.pdfIn PDF document text
    • https://vrindaindia.com/php/joseph/uploads/file/tawulanudosa.pdfIn PDF document text
    • https://rozynoklinika.lt/userfiles/file/buxuluvukijumupareluwumal.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_off0000b7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cfd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFD7 15872 bytes
SHA-256: 14b0994b8565810a1a7429c8245729af46862771b63015b7bdc75e853aaccf6d
font_02_sfnt_off0000f80d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF80D 10748 bytes
SHA-256: 1f409b5a62ea5c2ceaa8c027afe9e723670e5b7771d952bf591c09123aa8fd1c

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