Malicious PDF — malware analysis report

Static analysis result for SHA-256 e67d4fa85e231e83…

MALICIOUS

PDF

82.4 KB Created: 2021-09-04 08:34:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f31e3e914b5372e9b5f2c9af8b67e1df SHA-1: 0ce245d057b6b3e0e677db3502ba56ece845365a SHA-256: e67d4fa85e231e83e5557ae4129bd2ad977dca972c2ad32df18a90f8c3d5ac90
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs pointing to potentially compromised websites or disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded links are consistent with a phishing campaign aiming to trick users into visiting harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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=hawker+hurricane+flight+manual PDF link annotation
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b97efd048c4---29498591355.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/gesevab.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/e5fdbea091ad68275629b301e181ea60/pisimabes.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/79070583318.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/femelewukudedupikob.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161046f84e3685---37698054515.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/menaraj.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/d86e901ef9759e26176054d89f81b7cd/mexorovurenugikonob.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/07ca80a4433ad63fc9691957dd95d387/sanalojuwojodinubexanise.pdfIn PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/gudawerogajo.pdfIn PDF document text
    • http://aimic.com/userfiles/file/28465128750.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16100fc0a46cf3---mareranotidupezal.pdfIn PDF document text
    • http://sziazsauto.com/uploads/files/13899643967.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/29ac5dcf36ca01a7a763866c0611927a/gegademawodozuga.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/fqa1t38c1o4a3h16i7tufn4ga3/42119830490.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/nafapigim.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/56662837420.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/89ktnjfme34alf4f5fs4coe579/62772797250.pdfIn PDF document text
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/160720fb238d89---27906609765.pdfIn PDF document text
    • https://bem-sa.com/img/file/21615291070.pdfIn PDF document text
    • http://talesma.com/E/file/noverudid.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070b2217b621---6150971607.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_off0000ddf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF602 17824 bytes
SHA-256: 55d2312fee9a0e56beba1694fbc319dd683629de9bc2c1a4ac32540b5647a373
font_02_sfnt_off000123ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123EA 10764 bytes
SHA-256: b0e27f13b29c7e5d94e757557d3d31d737b4eca0591551b838d4dc38c93de490

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