Malicious PDF — malware analysis report

Static analysis result for SHA-256 89c616b6d1b1585e…

MALICIOUS

PDF

86.0 KB Created: 2021-09-13 00:30:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c2e4a70b7374d6e8a6cf5089267255c1 SHA-1: 9cae068466a898aa95ed7144be608e7f05018781 SHA-256: 89c616b6d1b1585eba5a70526b38c8a59fcf998afcc86dac10c4cede7bfed841
172 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript stream and numerous external links, including those hosted on compromised CMS platforms, suggest the document is designed to redirect users to malicious sites or download further payloads. The presence of a visual download button further supports a phishing or social engineering attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://irlanc.ru/uplcv?utm_term=camscanner+pro+apk+for+android PDF link annotation
    • https://matfplayer.com/calisma2/files/uploads/9084278879.pdfIn PDF document text
    • http://bobhendrix-law.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lelogi.pdfIn PDF document text
    • https://weborder.cloud/userfiles/file///fabipuwuboda.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/aevf1pue4ssbfin921tl3n93rd/97028384063.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/fukebipojideliwuvof.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/zujewixijigezoz.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/sijagaf.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/80071667987.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6a4ec6698---48794511911.pdfIn PDF document text
    • http://www.pvvc.cz/files/kunesosow.pdfIn PDF document text
    • http://kasand.com/userfiles/nafepobexipewuva.pdfIn PDF document text
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612f108f639e0---sokifumatavig.pdfIn PDF document text
    • http://tipkeo.com/js/ckfinder/userfiles/files/bojobig.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139c078449c0---843363189.pdfIn PDF document text
    • https://royal-art.pl/uploads/userfiles/files/99305896.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/katavenifeme.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f2842229---84619655338.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161380cf3c52ab---22140382492.pdfIn PDF document text
    • http://giga.sk/storage/file/fadowabivudulos.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/50299776737.pdfIn PDF document text
    • http://duef.ru/public/file/72095806292.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210905204740_973338284.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132af69b3f4e---juguk.pdfIn PDF document text
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/923710c67c6f1cdcb3a3e48938bd655e/34967605677.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/bexalupulosofijiseli.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_off0000eb5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10375 10760 bytes
SHA-256: c23a6d808fbb03f881328806c77f4664f867c8388cba154a2dee8fe40b3a95ab
font_02_sfnt_off00011c25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C25 17284 bytes
SHA-256: 52c935da3c18ebbbb3443e07acca024e01413b5d8666314259f3198254629018

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