Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dad0322ed835a8d…

MALICIOUS

PDF

74.9 KB Created: 2021-06-16 02:43:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4f40994484912c5a503c11baf305407d SHA-1: 7a6c2c65d992ca7d9b2b4189a516575aee5e32dc SHA-256: 9dad0322ed835a8df1162ecfaec3dc0ce5d8dabaccaf7f0a814ed823876c5770
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities and delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to compromised websites and potentially disposable hosting, suggesting an attempt to distribute malware or conduct phishing. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • 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://coretry.ru/uplcv?utm_term=solve+for+the+missing+angle+calculator
    • https://kisikana.hr/userfiles/file/11234185188.pdf
    • http://acpiindia.com/userfiles/file/rufawav.pdf
    • http://pension-erlkoenig.de/img/editor/file/38786297487.pdf
    • http://www.hydro-tg.pro/upload/file/40613065066.pdf
    • http://fandimnarodaku.cz/upload/file/78817713586.pdf
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608f2003006a7---87587406965.pdf
    • http://narcisse.sk/editor_uploads/files/jadaw.pdf
    • https://pensionatiitalianiinportogallo.it/wp-content/plugins/super-forms/uploads/php/files/cf26a29ba911cfa9f054f6adbaba0387/69607526947.pdf
    • https://imad0c0.com/js/ckfinder/userfiles/files/devijaj.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d1e19fb21---6461135073.pdf
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/vt1df0sh23slv6mcqbs43kiiab/jidijemotila.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a43a970b14---digoj.pdf
    • http://acpiindia.com/userfiles/file/44952950456.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/ddc435538d0745f4c8c57b5b1842484a/jegenukonejararopipef.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ca693292365d71414869269f2467ef91/3020100638.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4bf.bin
b303507df2212b4ba7ffdccd4e546e76bb94e643db30c0126b7b557ea929084a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BF 5460 bytes
font_01_sfnt_off0000f72d.bin
236c35443b886016950bd2363f4128f9ba9b95b9810a004a135444f539e34288		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 11708 bytes

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