Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f4a9878e48d7365…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 07:01:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e236df2b67b9d06e686e4ff516602882 SHA-1: c7f8145afa95a703c2e24d976472a44fd005d6b4 SHA-256: 3f4a9878e48d736530814a4ab822a0cf6ab8c1f7bd702ffe17fd129c60edcb92
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF document is identified as malicious by ClamAV and a machine learning classifier. It employs a common phishing tactic by presenting itself as an image-only lure, likely a screenshot, to entice users to click on embedded links. These links predominantly point to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 2 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://pluimveebeurs.com/userfiles/file/mimolozub.pdf In PDF document text
    • https://kalyna.ua/sites/default/files/userfiles/file/81765995761.pdfIn PDF document text
    • https://jecoexports.com/ckfinder/userfiles/files/93994809237.pdfIn PDF document text
    • http://isisthailand.org/file_media/file_image/file/74002366830.pdfIn PDF document text
    • https://vmgeducationtrust.org/home/vmgedu/public_html/public/userfiles/file/gakitekaroregozuri.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/6584777265.pdfIn PDF document text
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/161483dc4ecec9---10158490528.pdfIn PDF document text
    • http://lnhaihui.com/userfiles/file/20210911165452_1797873020.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/161377ed71ecc7---84928655283.pdfIn PDF document text
    • http://holzbau-napetschnig.at/58680871897.pdfIn PDF document text
    • https://aymfly.com/aym_image/files/vasikijabori.pdfIn PDF document text
    • https://angem.fr/userfiles/file/kabunexixivaboridadibok.pdfIn PDF document text
    • http://uktohabbarijamalta.com/files/file/vogutugomowiz.pdfIn PDF document text
    • http://chieusangducphat.com/uploads/userfiles/file/97193835738.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/donamegizotufolif.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/nuxagixuborud.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/gikavivojura.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/retanavoredilugo.pdfIn PDF document text
    • https://invision.buzyhub.com/files/67175768975.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/39625697638.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138b1ffd95a5---poralukajaguzofiwoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=craft+vegas+mod+apkPDF 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_off0000abb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xABB3 10788 bytes
SHA-256: fb374171acbb7a6517e69b674e28441868ec9bba091ad373b9e806fb9581c033
font_01_sfnt_off0000c476.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC476 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC88 14652 bytes
SHA-256: df001f4fa9c57eabbeedf8bf29d56049cfc04b582bbd9a158f2d66ecd3c584e8

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