Malicious PDF — malware analysis report

Static analysis result for SHA-256 94154b673d8fea9b…

MALICIOUS

PDF

112.8 KB Created: 2021-08-19 18:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: ee822617e7223f77bc32119eea8c8adf SHA-1: 3b1564212ede607c4542e47eee93f3d7e5dda103 SHA-256: 94154b673d8fea9b18a8922f6984f7fe9029ce263d3aff7426d8af6b895ae347
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The presence of external URIs and link farms indicates a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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=%D0%BA%D0%BE%D0%BD%D1%82%D1%80%D0%BE%D0%BB%D1%8C%D0%BD%D0%B0%D1%8F+%D1%80%D0%B0%D0%B1%D0%BE%D1%82%D0%B0+%D0%BF%D0%BE+%D1%80%D1%83%D1%81%D1%81%D0%BA%D0%BE%D0%BC%D1%83+%D1%8F%D0%B7%D1%8B%D0%BA%D1%83+6+%D0%BA%D0%BB%D0%B0%D1%81%D1%81+%D0%BF%D0%BE+%D1%82%D0%B5%D0%BC%D0%B5+%D0%BC%D0%B5%D1%81%D1%82%D0%BE%D0%B8%D0%BC%D0%B5%D0%BD%D0%B8%D0%B5+%D0%BE%D1%82%D0%B2%D0%B5%D1%82%D1%8B PDF link annotation
    • http://gitimohammadilakhimpur.org/ckfinder/userfiles/files/82725541264.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/m44a9ccooifshajnmoc0eia65b/46716084778.pdfIn PDF document text
    • https://cashcruis.ru/wp-content/plugins/super-forms/uploads/php/files/f27e5ed89d0b084218df88155e1acd30/bunozifufuluwela.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/f021a824107aec973105d1a40729d732/19842563464.pdfIn PDF document text
    • http://startmatbaa.com/userfiles/file/36845574382.pdfIn PDF document text
    • http://lushexperiences.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dcd1dc8109---xekosiro.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/045da82d535bd861851f74b2ec6e8744/66440828485.pdfIn PDF document text
    • http://joyear.com/ckfinder/userfiles/files/41699982982.pdfIn PDF document text
    • http://wenxuezj.com/images/File/24337587840.pdfIn PDF document text
    • http://nfc.soo.jp/file/noxikovuditerixujukevadi.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/42710911438.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f595b718c5---piwanomulag.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609adf01cbcd9---24485987636.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/6162b73fe765e6223f25c24f7cbbfecb/72700296564.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210610094944_9nigds.pdfIn PDF document text
    • http://airsoft1.ro/files/file/99771275090.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16088a3b4eeaeb---7446679881.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a737df0ced---vedikuzarozowamogipe.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/49291177612.pdfIn PDF document text
    • http://computerdoki.hu/user/file/lebafadegu.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078c8165ab5a---95004862666.pdfIn PDF document text
    • http://first-group.kr/ckupload/files/tarukoxunofatet.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/gozewexagazusulevipib.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_off000123aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AA 11480 bytes
SHA-256: 1d746394edd16f14f6f693e550a4c810d6cdc74baa5c984e6f3e2d80872c1eec
font_01_sfnt_off00013e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E74 34924 bytes
SHA-256: 4f288ff291664e0909af57b5e722fc1b6cf3f82353b13a43507745069bf2ecb7
font_02_sfnt_off00019829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19829 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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