Malicious PDF — malware analysis report

Static analysis result for SHA-256 03bfdaa21375dbf7…

MALICIOUS

PDF

80.7 KB Created: 2021-09-16 03:25:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 99f62c5528280795ba69bbad06876fe3 SHA-1: b5287460c362a950cfddcc0a321ec22401834631 SHA-256: 03bfdaa21375dbf75b9d7e69344678cc52c24e64ff4f3fb93e785442ae83fcd9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code. It also features a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, suggesting an attempt to obscure the final malicious destination. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9887

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 https://zoldlaptop.hu/ckfinder/userfiles/files/nuxopanavuwuwomivexukalu.pdf
    • https://globalcareerclub.com/FCKeditor/userfiles/file/pewukeruxo.pdf
    • http://centreforeffectivecoaching.com/media/file/lumewepuvite.pdf
    • http://rjt1.org/upload/files/22682234918.pdf
    • https://zagi.hr/files/vowexorasadewu.pdf
    • http://hig-hegmann.de/userfiles/file/sitojizujoragumuwu.pdf
    • http://kondicionery-shodnya.ru/upload_picture/file/gifefisuritoretej.pdf
    • https://idea-web.ro/app/webroot/files/userfiles/files/77579709349.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/83476860021.pdf
    • http://e-photo.lv/ckfinder/userfiles/files/96755853213.pdf
    • https://ildiko-szepsegszalon.hu/userfiles/file/44596050242.pdf
    • https://vientangluc.com/upload/files/8371797442.pdf
    • http://simsvizag.com/contentimages/file/30013742778.pdf
    • https://momentous-inst.com/uploads/image/files/wiwefatanobiwebiserakadij.pdf
    • https://primer-spb.ru/files/files/90262933463.pdf
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/161333635086ce---42462483994.pdf
    • http://www.radio-kum.si/data/files/54099288408.pdf
    • https://sfasg.jp/js/ckfinder/userfiles/files/vitironelofidujiva.pdf
    • https://gencerenerji.com/resimler/files/viregadotonewefadimelo.pdf
    • http://zkqzl.com/uploadfile/file///2021090602054059.pdf
    • http://pasaru.com/upload/files/74266489896.pdf
    • http://nwatchonline.com/userfiles/file/maxusobonakojufipadazi.pdf
    • https://vnjhanoi.com/upload/files/2494843009.pdf
    • http://bnblspecialities.com/userfiles/files/nuxekekalinuromaxutu.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b95a0343dfa386d5bb32bd1ca9baf0f3/pokabejelen.pdf
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5c549bad3---16652376848.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=stream+friends+online+free
    • 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_off0000d85b.bin
841b35b231b27d76e2d018f4f5520b212ef593f69ade02555256b59bbcbfcfe4
pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 10588 bytes
font_01_sfnt_off0000f078.bin
31367dccd7998997d5f271fe30f8a9a6e195050746da77902e24d19663325989
pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 17392 bytes
font_02_sfnt_off00011d25.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D25 16792 bytes