Malicious PDF — malware analysis report

Static analysis result for SHA-256 b12331091546b67a…

MALICIOUS

PDF

80.9 KB Created: 2021-09-05 03:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 83b3e5183bba596e871cfd09e677670c SHA-1: ea14693706eb61648b4c56337ef58a444732c989 SHA-256: b12331091546b67a87f26e47a3ab7f113a326b52d85c27ccaaa4def5f8c665bc
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to domains that appear to be compromised CMS uploads or disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The presence of these links and the detection verdicts strongly indicate a malicious intent, likely involving spearphishing or exploitation.

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 http://hodgesmageefamilyreunion.com/clients/c/c9/c95619ca3ec29dd030dc8935b97378d4/File/57065878514.pdf In PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/84798983666.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/9875c0b78863d7fab7acca133c267188/jizirasagirew.pdfIn PDF document text
    • http://terezmisszio.eu/files/file/73687864392.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/76072155644.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/27037309561.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/160cba5a0c9337---43219260091.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d465af19a1---rodejorowunegadexarar.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d7cde84eb---jivigikozazaxu.pdfIn PDF document text
    • http://timandlor.com/userfiles/file/45214742745.pdfIn PDF document text
    • https://mls.lighting/wp-content/plugins/super-forms/uploads/php/files/5d47b325b5c5103250fb83b8ba9dc19b/96968812280.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-2/20210502033538255008.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/zewawuzowapegi.pdfIn PDF document text
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/3f481014bc1022af952f0dab42f2d630/senejodajofuk.pdfIn PDF document text
    • https://travelworld.ro/userfiles/file/95867170213.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/vorala.pdfIn PDF document text
    • http://kitpaisal.com/mypicture/file/60064488038.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16080f2ead5b01---timisinusaboli.pdfIn PDF document text
    • http://topoint.cc/userfiles/fckFile/20210618083219.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085dfae25c2a---24990337115.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a610d3920af---xupedimubexapoxa.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16077f3c4895eb---68650342455.pdfIn PDF document text
    • http://3lbordercollies.com/clients/a/a5/a537dd6ebb785c9f51a9b4acbfea693c/File/badugufarenuvenemem.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/752h7id66n56mcotgi5sk52ci9/17551065325.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160ac751e6bb3a---luxewemu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=las+cuerdas+vocales+pdfPDF 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_off0000d9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B3 17532 bytes
SHA-256: 1e0e3a3f40d308b1bb5d4c25c56b13033f103a640cdecaae88c7a8fd6c4c6e3a
font_01_sfnt_off000105c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105C5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDC 10440 bytes
SHA-256: 69ed34f4dde471be7bc0c6cdea0b20a78e969061483928cf11052c2ce55892dc

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