Malicious PDF — malware analysis report

Static analysis result for SHA-256 45882adb5aff92b3…

MALICIOUS

PDF

72.9 KB Created: 2021-08-27 03:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a32439fc56d7608e7bb50d1c3fdbed17 SHA-1: a07621ab3f223d530eb44666aebac79dd6b345f6 SHA-256: 45882adb5aff92b3b363df8328dae7ae674f5fcf08d84ef569c0ab3845127f74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The presence of numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggests a link farm designed to redirect users to malicious content. The PDF structure and embedded URLs are indicative of a phishing or malware distribution scheme, likely leveraging social engineering to trick users into downloading further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=english+file+pre+intermediate+third+edition+download+free PDF link annotation
    • https://shipnhanh247.vn/asset/files/4895275127.pdfIn PDF document text
    • https://tarsiman.ee/files/file/demepujukor.pdfIn PDF document text
    • https://vietspices.asia/uploads/files/dubelepewezazudivosal.pdfIn PDF document text
    • http://rallyteamwalraven.nl/file/27678718102.pdfIn PDF document text
    • http://daisytalavera.com/userfiles/files/59966662206.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/sutotezazapurekudo.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/zoxupumiginumuxadok.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/76262020104.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/45309626200.pdfIn PDF document text
    • http://stonebriarranch.com/clients/876969/File/73333615674.pdfIn PDF document text
    • https://eurotig.ro/file/46557539752.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/64452483851.pdfIn PDF document text
    • http://roughriders66.com/clients/f/fa/fa96273273f04fd2a06feef12b1e4d70/File/72969813080.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/34ab7555cf6bf330ed9a4fcf5217302e/18469100329.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/97328014008.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/56029439875.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/20468281719.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/wamizoderabemikusepi.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a2f335d860b---zelufimofajinal.pdfIn PDF document text
    • https://et-auditing.com/userfiles/files/nopuku.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161255452f374a---92585722120.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/1ffd135b683b2a4b347651d6e665f3d3/58861658947.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb807d04f19---kodisirujosukomu.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_off0000b9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d1ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1CE 11012 bytes
SHA-256: e8ea29742970dcf7b2334f3efcfd9d39211dadd06806e14f6cc7d2b2cb2c3450
font_02_sfnt_off0000eb00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB00 17020 bytes
SHA-256: 9fdf034c4826dd9ad42c8cce1aeed296c861b6f0e8be5a641e6cb5c22e328b19

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