Malicious PDF — malware analysis report

Static analysis result for SHA-256 98e255b2ddcb13c6…

MALICIOUS

PDF

76.9 KB Created: 2021-08-22 03:55:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2043f8e32b1fefa949b2398efb83a201 SHA-1: 3fd4b56c5f07f2752d917e6ec01aefa95eff3fbe SHA-256: 98e255b2ddcb13c69d53452396b8ce626b05dc5b37f318413fc3794c36f53615
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://afghansolar.com/userfiles/file/16189205970.pdf In PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/4c41b5a715ec73ac7b1a1f4fc936a3a0/tobaleranezesuxives.pdfIn PDF document text
    • https://vinatech.com/userfiles/file/95312679049.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/18720333167.pdfIn PDF document text
    • http://0965818789.com/CKEdit/upload/files/58749851212.pdfIn PDF document text
    • http://mytmbc.org/fckimage/file/31099432447.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/811ae67d92f4f20bc08a0ec5a01eb3d1/916981520.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/a84b6bbd37bc0728e9e27e293d90f6a8/63037548513.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607647b329f9d---jujanoradotexel.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607089176249e---83201085260.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1607a04a7bec68---vakufivi.pdfIn PDF document text
    • https://autoskola-scp.com/files/dimuruw.pdfIn PDF document text
    • http://technocom.pl/editor/file/jidaromuruwufewufegarir.pdfIn PDF document text
    • http://geoodwierty.pl/files/file/mimudezazumireno.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/81e94f2ff45d18ee29f41e835a26faba/24572879697.pdfIn PDF document text
    • https://attack.lt/images/files/44048052435.pdfIn PDF document text
    • http://allamericannursing.com/userfiles/file/41652420691.pdfIn PDF document text
    • https://facade-metal.ch/ckfinder/userfiles/files/37968521370.pdfIn PDF document text
    • http://www.wm-meyer.de/meyer/admin/editor/ckfinder/userfiles/files/muvixifotivifojifimem.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160787e56c33f2---bifitaj.pdfIn PDF document text
    • https://hashtag.school/userfiles/file/46989886926.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=9.s%C4%B1n%C4%B1f+fizik+kuvvet+ve+hareket+klasik+sorular+pdfPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/18005750369.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_off0000c59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC59A 17400 bytes
SHA-256: 5043ee561f5ac94601e9825ff1a0ab9213561e16bf50925d7f4b326103a70ffe
font_01_sfnt_off0000f0e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000108fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108FE 11096 bytes
SHA-256: d4a1ff91790f3d105dbdb599d25e53f903975f18ca7c8bef93c1c2947d7986b6

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