Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e98936a9bdf48ba…

MALICIOUS

PDF

83.3 KB Created: 2021-08-20 23:18:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: db0b7208405b3e168cc50661de68f63d SHA-1: ac503ef41c1f671e809f1ffb07cb6c5ad6f951bd SHA-256: 8e98936a9bdf48ba157408663537004dc0d0ac643c4200c8e32e74ea48a0cda3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to potentially compromised websites, suggesting a phishing or malware distribution scheme. The PDF structure and embedded links are indicative of a link farm attack pattern, likely aiming to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/161147cda2db0a---70649537138.pdf In PDF document text
    • http://timesofbangla.com/uploads/files/34162897822.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607599d953d8a---fegosawijirosafuxirem.pdfIn PDF document text
    • http://aotwresort.net/ckfinder/userfiles/files/fixuzesexonamademidib.pdfIn PDF document text
    • http://geobigoni.it/userfiles/files/romemur.pdfIn PDF document text
    • http://kaztelcom.kz/ckfinder/userfiles/files/9577092309.pdfIn PDF document text
    • https://controlcert.se/wp-content/plugins/formcraft/file-upload/server/content/files/16070362b7d657---milura.pdfIn PDF document text
    • http://taiwanglassgroup.cn/userfiles/file/90340333604.pdfIn PDF document text
    • https://bustotoronto.com/userfiles/file/sesajesum.pdfIn PDF document text
    • http://purofirstli.com/userfiles/files/ginasumofudinoxajem.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/mutizonidawav.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088ccb2e4ae4---kegoleziferoxo.pdfIn PDF document text
    • http://silver1979.com/upload/file/24614371920.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/92472559964.pdfIn PDF document text
    • https://vegas-shop.net/uploads/files/10313532935.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/38433312547.pdfIn PDF document text
    • http://sllight.ru/design/img/upload/file/47873318300.pdfIn PDF document text
    • https://puertoestereo.com/wp-content/plugins/super-forms/uploads/php/files/s8060c93gaok4pakvqehb488lq/58742115799.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160812a86b3959---gugipusawovageda.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609463889ffa2---kokelawuvoxipimefuw.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/judaxetawozokamu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/57798504255.pdfIn PDF document text
    • http://elsekmont.eu/userfiles/file/rirovabakuta.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=call+of+duty+mobile+mod+menu+apk+obbPDF 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_off0000dd3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF551 10868 bytes
SHA-256: aed3e444bdda434da97d0e44f5fc685d912a2c0b59dc0ae4441e9676bc0fc6ff
font_02_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 18800 bytes
SHA-256: af6b1ae2e06c5ab20fddb5c24c7e949ccc128b23705f8b5b8aba261ec23e6a45

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