Malicious PDF — malware analysis report

Static analysis result for SHA-256 da3ada818e87b495…

MALICIOUS

PDF

73.3 KB Created: 2021-09-14 13:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d45af7c0c4f510d7048fd93ab99c16a7 SHA-1: e5e1ad7d1c9446568ffce00f0fc42033e36db90a SHA-256: da3ada818e87b495318036c040a8a3de149a68553dbc276aa643685f8f50f80b
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites and are structured as link farms. This suggests the document's primary purpose is to redirect users to external, potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8295

Heuristics 5

  • 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
  • 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://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a95096d7df---17360886824.pdf In PDF document text
    • http://world-spa-resorts.com/dok/46780979044.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/56620321779.pdfIn PDF document text
    • http://expertcomptablecourreges.fr/michel_courreges/userfiles/file/82082753950.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/15874934680.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd92f8091d---vizixixipaxokokoni.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e1608e0e0a---muvumunibogisivawudaze.pdfIn PDF document text
    • http://scbczy.cn/up_files/file/20210907_235237.pdfIn PDF document text
    • https://net-mex.hu/ckfinder/userfiles/files/tufenixikepuxovo.pdfIn PDF document text
    • http://art-wonders.com/ckeditor/ckfinder/core/connector/php/uploads/files/jilugufiwerileze.pdfIn PDF document text
    • https://cakkue.com/contents/files/tigivorimo.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/99930489233.pdfIn PDF document text
    • http://vtvxm.vn/userfiles/file/pobelaximovutuvasudikoxi.pdfIn PDF document text
    • http://tunesistudio.eu/userfiles/files/magolejujibutemojugunibud.pdfIn PDF document text
    • https://bednidhitraders.com/userfiles/file/1298980878.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/4658806670.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/rebevasava.pdfIn PDF document text
    • http://ahzgbh.news-read.com/upload/files/3819291430.pdfIn PDF document text
    • http://www.logomarcanet.com/userfiles/file/kopebinalusujojes.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/42360915088.pdfIn PDF document text
    • http://agriturismoilnoceto.com/userfiles/files/gavotakovewutunuxo.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/dasazomi.pdfIn PDF document text
    • https://uzmanwebci.com/calisma2/files/uploads/60948992232.pdfIn PDF document text
    • http://www.evisiontiendaonline.com/ckfinder/userfiles/files/51867865820.pdfIn PDF document text
    • http://ipoz.pl/userfiles/file/parezutupafuvoramita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=onmyoji+card+game+deck+listPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2C 11072 bytes
SHA-256: 8791cf1e78c9fc91866439322099808ecc12f0300187347169710a05e60ceded
font_01_sfnt_off0000f7c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1