Malicious PDF — malware analysis report

Static analysis result for SHA-256 defaed98cfa3b507…

MALICIOUS

PDF

78.0 KB Created: 2021-08-29 12:53:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6226f8f916ee5eb45d316c42ba75f2b2 SHA-1: 1bc30dca1e770206d8ca21c90949030496cbe589 SHA-256: defaed98cfa3b5075fa25d4e2224ec28fa140bde1b11cf62cad3856b0b87cff9
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it likely serves as a phishing or malware distribution lure. The document contains a large number of external links, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users. The presence of these links and the overall structure strongly suggest an attempt to exploit users via malicious redirects, aligning with spearphishing attachment tactics.

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 https://chcial.ru/uplcv?utm_term=chords+in+a+harmonic+minor+scale PDF link annotation
    • https://crownprolaw.cn/userfiles/Proj_Name//files/panadibozidunosaw.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/8f6b869cc659e86864f30d907e488a7b/gejubokajupopaxuxutafo.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161152744077da---satijekutefetujolowevir.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/raletovasumew.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/xomotojokewopaduf.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/91274648117.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a5ca89430f---tagetifefizotogi.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160909ddfe3b2e---sozuxupokiba.pdfIn PDF document text
    • http://greenplanetnepal.com/userfiles/file/zapesunetafe.pdfIn PDF document text
    • http://porpora.info/imagenes/imagenes_contenidos///83512336989.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7a64a44d7---lunatupekuluvu.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/eec0044b1a0029601237c2254cad5a12/26667843284.pdfIn PDF document text
    • https://ijaetis.org/ckfinder/userfiles/files/57303368664.pdfIn PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/97420240998.pdfIn PDF document text
    • http://jucal.es/images/file/27795515824.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/46198271539.pdfIn PDF document text
    • http://xn--12cm8caae5d9a0a0a1dxk6dd.com/user_img/files/jodabim.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b618bee1b41---86867563922.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/fumoporeretikos.pdfIn PDF document text
    • https://santehsevast.ru/userfiles/files/jowemom.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/rusuzos.pdfIn PDF document text
    • http://dongxuyen.org/upload/files/24491708903.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_off0000ccd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E8 17364 bytes
SHA-256: b9faaff90348c49dbd062ceb14bd799fee9adcff86f937a4b086ea3cb0c34aa4
font_02_sfnt_off00011227.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11227 10568 bytes
SHA-256: a82a6f0e7b90187eeb21b7dc55f0aec59430e213480681e5bf3ebc7966f0e6a8

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