Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bf2e8751391e93b…

MALICIOUS

PDF

76.2 KB Created: 2021-06-17 15:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 4c5d7a807a254ebd241533e498dc603a SHA-1: ea444bae43093874133474a9d4726d581333cefe SHA-256: 1bf2e8751391e93ba2a7402a9df28cb2f116e8cc18dd1016a2110df32db98a4a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a link farm pointing to multiple compromised WordPress sites, likely serving as a distribution point for further malicious content. The embedded URLs and the nature of the link farm suggest an attempt to redirect users to malicious sites, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8029

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://terravistahometeam.com/wp-content/plugins/super-forms/uploads/php/files/b9ff279477fb02daf22c222d6a83f3df/60137963370.pdf In PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/vteo974bfuti657j3di0j2vlr2/29891563213.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/ksnnmfgfij4vlje783ril0h9c4/99550533962.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160799c5787039---96090446989.pdfIn PDF document text
    • https://www.ideaklinik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609b72f6822d1---zejobefujuvowun.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/ligasusezinebesoroxuza.pdfIn PDF document text
    • http://wenxuezj.com/images/File/kudibexipunovoleraxabugo.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/2021517819384533.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/32959061785.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/30884878067.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a847d4af644---vosekin.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c747c2a54d---pojexabimapur.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/dd8476ba32889649d2ff242cc665cc10/deponesusitasininipazusup.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/fc60a5f99aae6fb8dc1f432ecf2796f4/pitud.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/17e51faaf29458627dfe5e18d6752846/zofaberonarowasofajoja.pdfIn PDF document text
    • http://africansafaris-spain.com/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%252Ffile/79657846921.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160895c2f8fe98---kevopizuwasafosopowije.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=landscape+pencil+shading+drawingPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF967 5888 bytes
SHA-256: 43373be23b0894bf7a4baa36b1b1d8471ac4f3b4ca7ad3ec8c502f89cb309428
font_01_sfnt_off00010e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E20 5368 bytes
SHA-256: 9f0452238ad8562d510050b87c3d56d8bbdf1f6e2cc4a01904c68740eec027d6

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