Malicious PDF — malware analysis report

Static analysis result for SHA-256 1139071f3af03a7a…

MALICIOUS

PDF

65.1 KB Created: 2021-09-01 22:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 65c6c67194ba9a27a442487674c4ab65 SHA-1: d05c6f038ecd38be4dd941c5b2b132b4895d6c33 SHA-256: 1139071f3af03a7ad52bc88c4438a20f0ab89435112a810f4cb3c3d4473b5736
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8628

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 http://smartraoptics.com/fck_filemanager_upload/file/kinagorij.pdf In PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/fixex.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/gojamesibixug.pdfIn PDF document text
    • http://www.klpreschool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160868c900a624---jedovude.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160915ac3bde57---segadirix.pdfIn PDF document text
    • http://dailynewsodia.com/assets/ckfinder/core/connector/php/uploads/files/27546854100.pdfIn PDF document text
    • http://www.77ice.com/upload/files/91259576210.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/91080888731.pdfIn PDF document text
    • http://thegioidahoacuong.com/uploads/image/files/19950239300.pdfIn PDF document text
    • https://kis-u.com/page_data/file/20210624035534.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1608031b6bd16a---12549936647.pdfIn PDF document text
    • https://cal.lighting/wp-content/plugins/super-forms/uploads/php/files/1aeba8f7bdc56d2a0d45d09a1d774f3e/82251005708.pdfIn PDF document text
    • http://geodeslaboratori.eu/userfiles/files/mixejup.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ca6086ef328---zipavitedeg.pdfIn PDF document text
    • http://recruiters-zone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9ed068b3d2---tozazagalusefasubogokeva.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/tujekoveluw.pdfIn PDF document text
    • http://ngpsusa.com/wp-content/plugins/super-forms/uploads/php/files/8nk44uij2o3b9hel9jemncmkr6/9022378199.pdfIn PDF document text
    • http://garystrike.com/clients/3/30/301ae0ed988f9237e4cb8f8c41f6cb36/File/25556619816.pdfIn PDF document text
    • http://school19-zav.ru/userfiles/file/pojuji.pdfIn PDF document text
    • https://jss-moms.si/upload/File/pupeb.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/49718098454.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/58199359778.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/tufifasuzazugawuzeboda.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/nuruluxowu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=super+opaque+meaningPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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