Malicious PDF — malware analysis report

Static analysis result for SHA-256 e61ff4fa82f0d8ec…

MALICIOUS

PDF

90.2 KB Created: 2021-08-08 01:19:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 438236f2386359be7fc287144d65a264 SHA-1: b12771da05041946953f7a109410abf1bfa746f6 SHA-256: e61ff4fa82f0d8ecd25245d32a498bbad95869ae176e3401852c4582cee7a917
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. The presence of these links and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://nomylo.ru/uplcv?utm_term=bollywood+movies+download+app+for+iphone PDF link annotation
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d27e41ac7f---rozomuwebakevowon.pdfIn PDF document text
    • https://dienlanhhonganh.com/images/pic/file/20713783423.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/lmnk2ubsffsg8f7svoa7tegg92/22308912281.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160b9f63bf2c9a---95974121503.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/xolofojixisototokex.pdfIn PDF document text
    • http://blesk-stroy.ru/userfiles/files/10047996473.pdfIn PDF document text
    • https://vestol.bg/files/file/60536113269.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/55023721186.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/b4g7nl7v5ua21rcqts8ebp4il0/80738074429.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ec4494d031a---10629007327.pdfIn PDF document text
    • https://almuhja.ps/ckfinder/userfiles/files/65117178064.pdfIn PDF document text
    • https://semut73.com/contents//files/8227270116.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/aa62932831c959febd986f7fd9aeb221/9126108142.pdfIn PDF document text
    • http://piotrkowska77.pl/zdjeciafile/lumevipejaturavegixev.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/43474907657.pdfIn PDF document text
    • https://estidevelopers.com/wp-content/plugins/super-forms/uploads/php/files/9d49759ff262a49cf98702d3f7f266f2/42816259612.pdfIn PDF document text
    • http://italiancousins.net/clients/5/54/54f3d33123424807706abe9154268524/File/dofuruwufaza.pdfIn PDF document text
    • https://www.hotwaterfactory.com.au/wp-content/plugins/super-forms/uploads/php/files/235f3a83590546bd107be711ef778c7d/gepajerodupiti.pdfIn PDF document text
    • http://batiment-tunisie.com/userfiles/file/vovofef.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/63633479881.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/29319231817.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a27fb84e29a---vowokixajotoxaxud.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8debbdcd84c4764c1daae66ecab3185a/papir.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d82a4306683---24127998739.pdfIn PDF document text
    • https://a2designbg.com/userfiles/file/keruvifedamatote.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_off0000fa93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA93 17480 bytes
SHA-256: daf1455126c43ebf3cbeb5321f2c5539ca9505f53b71746e5d6b9b2eb9fd962b
font_01_sfnt_off00012889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12889 10984 bytes
SHA-256: ad2ac9d51bfc6efb4a72fb460e523ea5425bc0e740ddbb0ebaa073d0daff0e3a
font_02_sfnt_off000141df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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