Malicious PDF — malware analysis report

Static analysis result for SHA-256 439830d52cd71a92…

MALICIOUS

PDF

78.5 KB Created: 2021-09-04 16:55:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 3f45c827979551ee06d1963da801c741 SHA-1: 06f95c013c6a5af37efe3b8c6834cb47e7d4e17a SHA-256: 439830d52cd71a92579b0f2c117fa6df3f077a602d730c4976c09ea2b6d14aa6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=marvin+minsky+society+of+mind+pdf PDF link annotation
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/vk67ffbllaa7q8glkdtcm7fep1/mumupogumuzosi.pdfIn PDF document text
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/pctk5g0jg47ih2oqblpns8urp2/bimejafufax.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/09fdb8a4349ddcb74d019104875f121e/ranogimediligera.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/22521821210.pdfIn PDF document text
    • https://stancijanegrin.com/userfiles/file/pitilazijidusu.pdfIn PDF document text
    • http://mirutte.com/newsfiles/files/nimojowajila.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/161237887b6d52---38430206732.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/jelakesanugugazasim.pdfIn PDF document text
    • http://huiking.cn/uploads/file/302207546336.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/13bf1ec92d47c6ef1b9770aee79f66bf/86082382459.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/16347711966.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ceaa21e70---98229031587.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/20582946389.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/palegima.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160abf82d95388---60017180595.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pudozajebixobosogix.pdfIn PDF document text
    • https://rosycaffe.com/file/debogi.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/lidasa.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/hbkjuokpkl3ulneo5sgc7uf9q5/32798359243.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083c501826af---34592935081.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16094deb07e895---43207626911.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/2djtc97jcs6oeag2pahlmnhbai/jivemanesala.pdfIn PDF document text
    • https://u-spot.biz/js/ckfinder/userfiles/files/wezina.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/10c3e912346d77c28c9a2b772530fafd/pomuxepifivuzepasumek.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1612508e8284e0---pukag.pdfIn PDF document text
    • 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_off0000cbd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBD4 11000 bytes
SHA-256: 6e0e6ef1336138758b7f5f0bddf22aa17cec303c6b99fcaee54f3b1ca7c1d418
font_01_sfnt_off0000e576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 18052 bytes
SHA-256: 3000ceb47bedc7a910cb3c0b0ac6746ba1f22fb98c7dc7b0ba9a2626f89ad66b
font_02_sfnt_off00011452.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11452 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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