Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f76c23bbb2d1528…

MALICIOUS

PDF

85.3 KB Created: 2021-09-20 01:55:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b754c5dd4581788aa6af5e2c6bd2ac31 SHA-1: 33672943385c9a286588d6ad5f1ecc2839d840a6 SHA-256: 6f76c23bbb2d1528d5172b6891c76c3fb8224a44052f2e03cef4066993a4fa59
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://allytemp.ru/uplcv?utm_term=how+to+download+subtitles+on+mx+player PDF link annotation
    • http://khodahoanglang.com/admin/webroot/upload/image/files/delod.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/ridapenegewuxudetukipirur.pdfIn PDF document text
    • http://erh-hu.com/userfiles/file/54329513086.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/gopalugab.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/jejuruvadasab.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/161404b08808b2---merefomidu.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614452593885f---vibotofin.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/3763972166.pdfIn PDF document text
    • http://baiduvpn.com/upload/files/gagarawon.pdfIn PDF document text
    • http://rpsbchamber.org/editorData/file/27570057226.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ff64b6c09b---82418450559.pdfIn PDF document text
    • http://weingut-suppan.at/files/11913210999.pdfIn PDF document text
    • http://cnsgafgl.netsociality.com/upload/files/buwigegumerajojijipuviruw.pdfIn PDF document text
    • http://sweet-sugar.de/images/uploadedimages/file/basolalizovatida.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/90491325807.pdfIn PDF document text
    • http://fotografieindex.nl/images/uploads/94956533059.pdfIn PDF document text
    • http://erfanekeshmiri.ir/userfiles/file/feduwigedodededod.pdfIn PDF document text
    • https://jdbailbonds.com/wp-content/plugins/super-forms/uploads/php/files/3ac1f3956f18f204e70978bfd90858df/97222384848.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/jizagesalivafuladasazuxe.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/fifibex.pdfIn PDF document text
    • https://mgc.to/sites/web/upload/files/24769256608.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/46998356067.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/muzeluxuxisukedug.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_off0000e61f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61F 18708 bytes
SHA-256: 7df1bb9375d140b596b3d9e2e1d40ed6bc46deef433cf8f67f05a016626d4dfd
font_01_sfnt_off00011603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11603 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E1A 11088 bytes
SHA-256: 81977354fa09aa8de802d1572dfcde7dc29e1c8afca08cafc23afda7de8f49a9