Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e388d85b3a0be2…

MALICIOUS

PDF

101.6 KB Created: 2021-09-10 12:20:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 6240b05ee1697c2ac93e96f3b4d74107 SHA-1: 3cc2a295f80618f9d7ba1726403ad7fe10efcccc SHA-256: 05e388d85b3a0be28a8c88467421312a901137e198cbf11530b59655e2c6d55a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised WordPress upload storage, suggesting an attempt to host or distribute malicious files. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c2eb88a68---suxuzipifititefoduto.pdf In PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8200dd4d1b87b4309be4b2f8fbd5332e/gunuz.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/11847508873.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1612f526a5e6ab---zitepisabobudezige.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/roxijorosulozojununof.pdfIn PDF document text
    • https://firsatpin.com/calisma2/files/uploads/35234672525.pdfIn PDF document text
    • http://xn----8sbfhu6ab4bqv.xn--p1ai/userfiles/file/jawopedoluxexa.pdfIn PDF document text
    • http://tichdiem.surecare.vn/uploads/userfiles/file/nokijakezexumebavo.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/92126475507.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/toxenedavixowuker.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/38c154d73f0f162b7e035e0f00f8e79a/derasopiwepedire.pdfIn PDF document text
    • http://pengyou-english.com/FileData/ckfinder/files/20210901_543157E0194AB354.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/papijejejame.pdfIn PDF document text
    • http://bright-inter.com/file_media/file_image/file/7115802636.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613105cfd3a25---xikomovamogovo.pdfIn PDF document text
    • http://mimarathi.live/assets/ckfinder/core/connector/php/uploads/files/43843468236.pdfIn PDF document text
    • https://dailyiat.com/html_upload/file/jinejolo.pdfIn PDF document text
    • http://strojsteel.cz/webpagebuilder/ckfinder/userfiles/files/gafigesilarikite.pdfIn PDF document text
    • http://jshtextile.com/UserFiles/file///51448538517.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/pajera.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/561f7f925e4247c7016206389534c1ab/ruluxuwezazutetoxu.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/ginow.pdfIn PDF document text
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613aebce6c4cc---vaposovejimowujewaludefog.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/nebuwaniramuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=first+squad+the+moment+of+truth+watch+onlinePDF 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_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 18408 bytes
SHA-256: cee09a5654e809144806c07b145549e208f2242e615c4d43e1cd84c6b2aa031b
font_01_sfnt_off00015659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15659 11052 bytes
SHA-256: 3d0d207ea15603d5b78a0a2df37d2ce3da7408d44b67350219520a802aa762e6
font_02_sfnt_off00016fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1