Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c939a23c3ece52…

MALICIOUS

PDF

81.9 KB Created: 2021-08-12 02:44:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 4ba20c6cb9b228d81da42440765c5fa8 SHA-1: b1507227dd6c245acc9bcf2166e8f95ee3745f6e SHA-256: 25c939a23c3ece52a102ddacfdcc4300cc7942f6d960d4898150de6ace01cbea
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://mundori.com/js/ckfinder/userfiles/files/wifabumubesimijanawiku.pdf In PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/b5l1thidk0ficbsd6a0q8901jo/lazalanabame.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/b4f3d5a02767b1134d05bc8500dd34bb/44443341798.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848a070262e---baruxawinuxulilazixe.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160915f2da02c6---17453378110.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/meao8cr63dudc5cqefbgeh79a5/tozigotekiwubopunitu.pdfIn PDF document text
    • http://edu-family72.ru/content/images/uploads/file/ronodimitetedizowiv.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/0efc6afcc12517545c23c473e8dbf85d/89834282444.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/milovusazozuxulezajo.pdfIn PDF document text
    • http://drapa-technika.cz/UserFiles/File/xomulerakorujekajibi.pdfIn PDF document text
    • http://email-database.info/userfiles/file/44534225572.pdfIn PDF document text
    • https://fanaf.comarticle_ressources/file/fabaxowefono.pdfIn PDF document text
    • http://radfordhsclassof1970.com/clients/878146/File/39753203363.pdfIn PDF document text
    • https://cfbadalona.net/ckdata/files/mefunalasilatadurox.pdfIn PDF document text
    • http://verduciautodemolizioni.it/userfiles/file/wigobuzu.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/4far1moeprm8uvfluon5t4ubin/riratuxurezavaxe.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d10b4fa00---51300031931.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/12b68bc9aee361836500b2439136ab8d/tilimi.pdfIn PDF document text
    • https://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/99852e0f1bbab5944ec6d30bbfea7ce6/28571163289.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b88cab3f78---jawilitinozutaki.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/696b84fe9b7fa85960d3efd7657ad850/vikepagaxi.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/h3ghjh2nhajuk46dqolb9aah54/27900278939.pdfIn PDF document text
    • http://nkmate.com/FileData/ckfinder/files/20210810_24EB8B59A7513F26.pdfIn PDF document text
    • http://asdgolfclubtoscana.com/writable/public/userfiles/file/gopera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=free+download+twilight+breaking+dawn+part+1+sub+indoPDF 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_off0000d99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD99A 17356 bytes
SHA-256: 0ed65f6cd3a84a1828a776605f74a03319dac0d3e9dccb30962cd295bbb162cc
font_01_sfnt_off00010719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10719 11116 bytes
SHA-256: f6a1c186ebf480666d2f3855e99c75880b43f18e159bff709a52102c260cc998
font_02_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1