Malicious PDF — malware analysis report

Static analysis result for SHA-256 3967fb370b15f6ab…

MALICIOUS

PDF

83.8 KB Created: 2021-07-01 00:15:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 30f7578e8593c7b36fa6cd03ec726624 SHA-1: 2bf81c53c2aac95083192bccd2486d6480680aab SHA-256: 3967fb370b15f6aba9407fba681e6f1cc40fb40b992023c07222122b36b7ddbe
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm pointing to numerous external URLs, many hosted on compromised CMS uploads or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a deliberate effort to obscure the final destination and leverage potentially compromised infrastructure.

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 http://nanumed.ro/uploads/files/binazuzukawerawo.pdf
    • https://www.arphplumbing.co.uk/wp-content/plugins/super-forms/uploads/php/files/oksf8c80s3a74snt57qifum216/60186510999.pdf
    • https://calmoinc.com/upload/editor/file/5138760990.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/0289006aee352422da62a8bd57199848/davodilagosupebekovepesos.pdf
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/nk092q4l68p25h56ju2uf7voe4/42079924896.pdf
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/zivaxusi.pdf
    • http://teplospectr.ru/images/files/kojenaxal.pdf
    • http://www.primalegal.eu/wp-content/plugins/super-forms/uploads/php/files/c2e73u9rseuve99bnscv810sm4/99749103652.pdf
    • http://dobrasekacka.cz/userfiles/file/dodejudiduwatasezuxopivav.pdf
    • https://sukhayurveda.in/userfiles/file/vanadivepus.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a90649161a4---69069509318.pdf
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecd0ddfe92---42133624483.pdf
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/f354a901a085e32b436d2e7e183fe7d8/85071912497.pdf
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/d7267692fef07793173d48779aa9585c/zabonibuzunowiboj.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/1k1139eka0k1dqr97n031nf580/77861553150.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078bc0153b1f---43630082043.pdf
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/16072d952e7eae---wonubipoxojasud.pdf
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/076l5kjroshc4isbrlo9oidj50/zutilosojadulilekuzebak.pdf
    • http://bakerfamreunion.com/clients/1/13/13be4b03bdabdd3a133c3ee64ed6201b/File/lepudegojanujigusegogus.pdf
    • http://www.cddfct.com/up_files/file/lujetabezotoxenovofi.pdf
    • http://daiichilogistics.com/uploads/news_file/pakalojovofoluzoloz.pdf
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jetud.pdf
    • https://likeevent.it/writable/public/userfiles/file/47751752743.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=best+screen+audio+recorder+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e55d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE55D 16792 bytes
font_01_sfnt_off0000fd74.bin
8a63204929b46fa63983181cbab9fbfd4e61d63db9e55191845ab9070e8ee44c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD74 10576 bytes
font_02_sfnt_off000115bd.bin
41881b08e2a56e8351a602d5b7bb309f19120eb8e9dec867bc4239a7fa42229d
pdf-font-stream PDF embedded font (sfnt) at offset 0x115BD 16868 bytes