Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e88acdf9c74787…

MALICIOUS

PDF

82.2 KB Created: 2021-09-20 15:36:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: fa13f84cc3799f2ed462e149a6b72d69 SHA-1: fd111288d811d13504d4a55b87468471389f866b SHA-256: d3e88acdf9c74787e83b7ae9c8c35ee35d6d907d3acca8e757f4ce241c858ae2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs pointing to potentially malicious content. Heuristics indicate a link farm on compromised or disposable hosting, with some links directly referencing PDF files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the presence of JavaScript and external links indicates an attempt to execute code or redirect the user to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 8

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://drafthe.ru/uplcv?utm_term=how+to+know+saved+wifi+password+in+mobile PDF link annotation
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/pigasufutozur.pdfIn PDF document text
    • http://enotecagaribaldi.it/userfiles/files/31576830563.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/44b89d1e7196b74bab9b3cbef05528c4/ridejabaditoxuvozurugexot.pdfIn PDF document text
    • http://irvinenott.co.uk/ckfinder/userfiles/files/ritepomeferugiguvew.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/6201907168.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/71866999564.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/zodegibugeno.pdfIn PDF document text
    • https://teamcode.net/upload/files/44504794897.pdfIn PDF document text
    • http://ituor.ir/basefile/chartermeinfo/files/86070895730.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/75099730049.pdfIn PDF document text
    • https://agregadoschucuri.sinecsas.com/ckfinder/userfiles/files/32739827554.pdfIn PDF document text
    • http://jyczgj.com/UploadFiles/file///2021091801494815.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/3372322686132999e8b731.pdfIn PDF document text
    • http://digitalqwerty.com/ckfinder/userfiles/files/wuteb.pdfIn PDF document text
    • http://atlantichomeportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361418379af---bakujedut.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/7258029774.pdfIn PDF document text
    • http://sukhonthip.com/file_media/file_image/file/61304520385.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6383b8f08---78701695536.pdfIn PDF document text
    • http://greece-ex.com/images/blog/file/99974528020.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/73306515539.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/99884532247.pdfIn PDF document text
    • https://maria-galland.ru/files/file/pinemerejetepitev.pdfIn PDF document text
    • https://babetravelling.com/ckfinder/userfiles2/files/98446920022.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/faxixesoforotimutogetegil.pdfIn PDF document text
    • https://sklep-pinokio.pl/web/uploads/files/famifukabirapodosapijaja.pdfIn PDF document text
    • http://ilyxrace.com/userfiles/files/28369099850.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_off0000d8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8DA 11036 bytes
SHA-256: 0454b94f0a423ad16aa9ea3d62fb7e1255096f5bb934b25c656cf437bccdf896
font_01_sfnt_off0000f24e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF24E 18688 bytes
SHA-256: 3467dab9d6ecd3622ddc41670202625e0b323b16e841cfb33667c25a7fdc7b34
font_02_sfnt_off00012312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12312 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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