Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b9a76e2adb46096…

MALICIOUS

PDF

88.1 KB Created: 2021-09-06 01:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 329d9ea1b5c5fe13acdd5aa18e055773 SHA-1: aadee15008911e5813328272afa669656bf0d037 SHA-256: 2b9a76e2adb46096c6ca014ad991c84c6b2ab53650593cbdd6dced5aab4a2281
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to compromised CMS uploads, suggesting a phishing or malware distribution scheme. The presence of multiple links on disposable hosting and compromised WordPress sites reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/p917mjh9quer2ds9be9vjpisrc/50185270984.pdf In PDF document text
    • http://lucann.com/Upload/file/70280981316.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/0e8705a7a88aa0e8cd109311ebc45972/51595904984.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/b8eba3fe028defffbd08b9ee68e44ab7/natosifutawekekemesu.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bcf64cf2a8b---14246923936.pdfIn PDF document text
    • http://mudrberanova.cz/userfiles/file/lofuxapa.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/91558542028.pdfIn PDF document text
    • http://baliretreatcenter.com/olabali_ci/media/images/newsfiles/58886633196.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/81065204739.pdfIn PDF document text
    • https://opsclown.it/ckfinder/userfiles/files/82884782377.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/bt899h33pv5n6q70klkpocbk2h/wawiva.pdfIn PDF document text
    • https://www.democratum.com/wp-content/plugins/super-forms/uploads/php/files/c91a0eb0349d7724f01561854494c8b5/44006396852.pdfIn PDF document text
    • http://www.shjkyq.com/up_files/FCK/file/voxajumis.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/275cbb39828d8f08c4bc8446e22ef242/bapukugoximofo.pdfIn PDF document text
    • http://edwardfmcgintypa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wifoponejat.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/8b2bff9f6103c6538b09668cdbd96c39/16563753698.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d8805d2c2---lugijodidanutojurad.pdfIn PDF document text
    • https://thejinglelab.com/wp-content/plugins/super-forms/uploads/php/files/31hjiarli8firn3af39pu3aviv/gakomimarajugokerapigibu.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160db5e65bba9e---wuvamujivogegebemojera.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072c620b931f---mimepiw.pdfIn PDF document text
    • http://linker-apps.com/files/pijusasusutaz.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/valonefujosejakig.pdfIn PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081f7f7e0781---4581978626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=m%C3%A9moire+psychologie+sociale+pdfPDF link annotation
    • 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_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10431 20664 bytes
SHA-256: da2d9b636bdff9bdcd4f721f340bf841f3ebfe0328fca9b18b7bb9706b2b5bdd
font_02_sfnt_off00013741.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13741 11124 bytes
SHA-256: c499089dc8daff0772473e86b3eeece06c2a94aaa694fb3b75fce4574aad78cc

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