Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4a17244b052c584…

MALICIOUS

PDF

79.5 KB Created: 2021-09-07 18:46:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3b297b0abf5d52402988f117ba20a917 SHA-1: 5ddf5cb0472b7a9636461fb1c44bcc50adfd1e7a SHA-256: c4a17244b052c584e3de91ea400e428e121ef511a7dd0d3d7a7dc2483fa88e2d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and a link farm hosted on disposable domains, suggesting an attempt to lure users to external sites. The presence of embedded JavaScript further supports the malicious classification, likely used to facilitate redirection or exploit vulnerabilities.

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://huntic.ru/uplcv?utm_term=sorting+worksheets+in+excel PDF link annotation
    • http://medicare-darmstadt.de/bilder/UserImages/file/44431773190.pdfIn PDF document text
    • http://superfasttv.com/uploads/files/xobogufepuzumipel.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c971cd049c1---8918946789.pdfIn PDF document text
    • https://yourlightingbrand.com/wp-content/plugins/super-forms/uploads/php/files/7e23225a9ee0dff83038d80c860da535/73871749401.pdfIn PDF document text
    • https://registracijakoncar.com/webroot/js/ckfinder/userfiles/files/zokasowatefaw.pdfIn PDF document text
    • http://applecentervn.com/uploads/image/files/serixokaxekanafumo.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/c5216a373770c099ac226fc5c2de9222/50166895419.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/20633868843.pdfIn PDF document text
    • https://retta-bg.com/userfiles/95630167151.pdfIn PDF document text
    • http://www.beautyvogue.ch/Files/file/64420713308.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1609d054b6761a---gulitalufot.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc44fd29052---vuwexijex.pdfIn PDF document text
    • http://cerezolorente.com/files/cerezolorente/_repo/file/mibuxixoxiwopi.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/zegususugoleroj.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/foziriwa.pdfIn PDF document text
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/89419523132a760d3cdc7cf968e0171d/najazexalowajixuju.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/vemanad.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/8ac6bbd29698f39fdb7d224af1dc61b9/neramakaval.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c6f438af3f1---jugulovabowexa.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/684482ceed4ecbff523a4b99f7ca666b/20295369588.pdfIn PDF document text
    • https://eslms.com/userfiles/file/47542086329.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/kobakakulovo.pdfIn PDF document text
    • https://www.shopveriamici.com/wp-content/plugins/super-forms/uploads/php/files/e6ghp19brrqvm8c1n410oeievs/8423804352.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f964414dbc---25544264865.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_off0000d115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD115 10700 bytes
SHA-256: a923458080226d3abe8886c414614a6bee7e99bec765bfe4df1692793eb941d9
font_01_sfnt_off0000e9a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 18160 bytes
SHA-256: 31839e007b24f9d253d4a861861256c9b872974d1176d310b1f1477dfdcb829c
font_02_sfnt_off00011844.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11844 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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