Malicious PDF — malware analysis report

Static analysis result for SHA-256 b57c33bd517f46b8…

MALICIOUS

PDF

80.1 KB Created: 2021-09-06 01:06:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 377388a70f3214bd3f8b2b019f7eee8f SHA-1: 269cb8bb36079fe0852ee0b48eed7616178a61f0 SHA-256: b57c33bd517f46b8ff2bc6dfe782948b6a67c8a0fceea8207eafc5fe7607097b
96 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to other PDF files hosted on compromised CMS uploads, indicating a link farm or distribution mechanism. The ML classifier strongly flagged this PDF as malicious, and the heuristics identify it as a link farm on disposable hosting. The primary purpose appears to be directing users to potentially malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 5

  • 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 http://profisystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160e40da388635---pevulivuzolezabapakew.pdf In PDF document text
    • http://dj-maily.com/uploads/pages/files/66712583117.pdfIn PDF document text
    • http://matrixuniverzum.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16079b0cd67ec9---notoj.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/kadamazekofatarakir.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/94964342617.pdfIn PDF document text
    • https://clubelsendero.com/img_pag/file/8118312122.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/l2gl97bqteitf3rg82lm9s6dop/lawowaresazi.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/53999754273.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210809003432.pdfIn PDF document text
    • http://bydnjl.com/userfiles/files/5121666688.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/bobulopurekowazuli.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/92531340629.pdfIn PDF document text
    • https://www.treehousecare.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607e454dc5f55---58259960485.pdfIn PDF document text
    • https://lisacutler.com/wp-content/plugins/formcraft/file-upload/server/content/files/161009ff44c9a4---deturoti.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ec2275b4---vizunalijo.pdfIn PDF document text
    • http://birdviewjoey.com/webroot/uploads/files/77070286118.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/17605161902.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/potukibomaraduwirefeturo.pdfIn PDF document text
    • https://angkagenap.com/contents//files/giwav.pdfIn PDF document text
    • http://bnblspecialities.com/userfiles/files/75908836104.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/16070897b49db4---vigaje.pdfIn PDF document text
    • http://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c98ce1b3e00---86063088301.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/setumewuro.pdfIn PDF document text
    • http://kjphotocon.org/data/userfiles/files/60597949938.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160749e8950aa3---62815959913.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/jukuliwevat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=blackbox+and+whitebox+testing+in+software+engineering+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_off0000d513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD513 16756 bytes
SHA-256: fbe198b29476866a3eb675c175cf0670d6a434342c701456b7a33bca9939d8c1
font_01_sfnt_off0000ffb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117C9 11372 bytes
SHA-256: d94098cb2c3344084fdfd99ac0652896cb5c965bd6ef689dc4d584885a5e4dad

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