Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1ee44d71650591f…

MALICIOUS

PDF

87.3 KB Created: 2021-08-02 01:50:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2e491a2ea027e681352b396ecbbd7917 SHA-1: 41acd24903f25f34864ff7ce2b8413aed70c9a45 SHA-256: a1ee44d71650591f5561e91b62069240e1709ae8d8e29e8e29e83b207771300e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, forming a link farm. This suggests the document is designed to lure users to external sites, likely for phishing or to download further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://vinag7furniture.com/app/webroot/files/editor_upload/files/84888041218.pdf In PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607258ff8a602---pujatefejeba.pdfIn PDF document text
    • http://russkiivopros.com/images/FCKeditor/file/sozimejabixu.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/fovitezi.pdfIn PDF document text
    • http://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1608255f0155aa---dewolutusuwiwowizabove.pdfIn PDF document text
    • http://slp70.com/clients/873855/File/parezozoxepotowu.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071542e3a378---bebujimetavemu.pdfIn PDF document text
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/mobovirosafojewutuji.pdfIn PDF document text
    • http://fixmyhelicopter.com/project-new/christianbook/upload_images/file/matonulegunulizini.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161052c11190b9---rexilanenuwemifetajave.pdfIn PDF document text
    • https://vientangluc.com/upload/files/8267800508.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc81036ac2b---sarowitaporoziwedidupad.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/potidifadisitubug.pdfIn PDF document text
    • http://csc-vietnam.vn/uploads/userfiles/file/levezo.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/11817402438.pdfIn PDF document text
    • http://marcth.pl/media/fck/file/tifitokanaxaberakini.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/vuzosewubefapexozizelivi.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/52994826998.pdfIn PDF document text
    • http://klefmarken.se/upload/file/40911647201.pdfIn PDF document text
    • https://nhadatonline24h.com/Images_upload/files/wuwuwam.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/lowibojum.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/wuvipeseker.pdfIn PDF document text
    • http://fitviewer.de/files/file/xagaxakakoni.pdfIn PDF document text
    • http://cpgny.com/userfiles/files/61181828638.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ac30db89b91---meroginexigomafutolozimav.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=philips+respironics+cpap+machine+partsPDF 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_off0000f2ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2CA 10640 bytes
SHA-256: e66c90aa7b0443b6a567463fe059222c3c41de51c29dc1b941f4b7c374b03918
font_01_sfnt_off00010aea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AEA 17196 bytes
SHA-256: 3a2e8b327d3862d9a4f1467e90fcd5eab4923a8a5443b99ca88089766720c672
font_02_sfnt_off000137c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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