Malicious PDF — malware analysis report

Static analysis result for SHA-256 25e231f443454b63…

MALICIOUS

PDF

79.1 KB Created: 2021-09-04 14:22:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8e52c5c0d370ba76bb62cc62f46149ae SHA-1: 14ecd9dff5d5070691271ded7b60c757e5752cd3 SHA-256: 25e231f443454b63c183879aa3f4fc254b379e4c432559f955a59b255e825233
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features a link farm pointing to multiple compromised WordPress upload directories, suggesting an attempt to host and distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/be1f4457c8858331a229bd3a0049054f/narudisefulejugu.pdf In PDF document text
    • http://0930actress.com/files/files/kaminizapirawexifizufarok.pdfIn PDF document text
    • https://www.cibaospalaser.com/wp-content/plugins/super-forms/uploads/php/files/pps3t0f9cbckrea3m3qc4rgusj/gomexebisarupuboniv.pdfIn PDF document text
    • https://vibanghanoi.com/uploads/files/mawiraxelir.pdfIn PDF document text
    • http://atallmed.com/userfiles/files/71153308802.pdfIn PDF document text
    • http://corporatiegids.nl/uploads/files/zibogidodurapukomanevaji.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/gevuwajerokav.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/3ada7abaa55f2e96143443efa4dc5ad0/dopomevepudija.pdfIn PDF document text
    • https://cleanenergy.mn/uploads/files/sojosejutesitenid.pdfIn PDF document text
    • http://fautographie.org/images/userfiles/files/kajirofedukagifi.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16090ea21553ab---80817698710.pdfIn PDF document text
    • http://fatfailogistics.com/fckeditor/files/file/87576969049.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1611496882a8d6---bigalekeviwe.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/25285165653.pdfIn PDF document text
    • http://vtaky.sk/media/file/golovadojuwezavim.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/37429506647.pdfIn PDF document text
    • https://gobelsprofil.com/upload/files/93285563497.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/16070ce534087c---67592500857.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/75669039238.pdfIn PDF document text
    • https://keiba-like.biz/js/ckfinder/userfiles/files/10267544869.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/27739c0ba373dc19e44f6960b1e63438/mekimodo.pdfIn PDF document text
    • https://lazerom.pro/media/file/71685933948.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/da47a27a7e2f0da63e3f22eb2cc1f59b/26796192574.pdfIn PDF document text
    • https://h16hr15k-h19hr37urn.com/contents/files/32022250064.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/620ea369aab190100e82cf32aec042c9/dulutixuz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=webster+dictionary+pdf+fullPDF 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_off0000ce41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE41 18320 bytes
SHA-256: eba1fd052209fdbd2943c0cd95caa25072f704da75def17e9cb4489aeaeb26ac
font_01_sfnt_off0000fd2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011543.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11543 10960 bytes
SHA-256: 8bea1d53c9ab6307e7055db281de39819bfb742e47e483f2dfce364da5ca4933