Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ff33780db39f83…

MALICIOUS

PDF

94.9 KB Created: 2021-07-03 00:31:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 5d801841e02eb4feb5f82d49f4bd4a75 SHA-1: 8cf1b3598f5de86f9dd82ffd0c20d6327b859b1b SHA-256: b4ff33780db39f838af6cd0fd2799cca334fae05d5417f6bbc3e1a23cc5a5a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a link farm pointing to multiple compromised CMS upload storage locations and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The document body is unreadable, but the heuristics and URLs strongly indicate a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://www.argentum.com/wp-content/plugins/super-forms/uploads/php/files/nva07n88k0r9qhdrfl6koaageq/68116932054.pdf In PDF document text
    • http://infrabud.eu/fckpliki/file/sorizewubijupibofurikil.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/c44fcb0c6f5a72d3b5e9160f7ef18b92/matoxemokijusuge.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609697f2c8cd9---45881008916.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/np0hetssckkqegmbadk62j8l7g/nugefofuwubumabevonaliw.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed9d82f99---nalodiw.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/17412269119.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608777efbe839---lawatafuninuvebisun.pdfIn PDF document text
    • http://amblesidewindermere.ca/fckuploads/images/file/zigisakizub.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607963a951330---sozupil.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16085085643179---21897230330.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/jowopupiwaxefetibokomen.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/83adl00pkrkh2hfjrgb0f1jsv4/24010829519.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16080e693c4214---jajewebub.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609660df9646e---77607178913.pdfIn PDF document text
    • http://computerdoki.hu/user/file/kikawumemu.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b737192a011---61043557710.pdfIn PDF document text
    • https://miet.hu/kepek/defegavewavawomazuzoliwo.pdfIn PDF document text
    • http://watch62.ru/files/files/23680643580.pdfIn PDF document text
    • https://kawanmto.net/contents//files/17817825354.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/11bec8112a63edb4fbdcd914860d1009/zozalipifetudexidetukuxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=what+states+do+not+change+their+clocksPDF 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_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 10732 bytes
SHA-256: de7de8ceb1694340e8ffde9e9c6bb50607e1d1f11d26903b2162fa3b0c721fa0
font_01_sfnt_off00012b2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B2B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001433d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1433D 16520 bytes
SHA-256: fb5b643dbc99e36a3fad3d49ac2dbf4ef1f0c9d0cb9986051403ea8f29db6060

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