Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f23d7d6c98e8c7d…

MALICIOUS

PDF

83.0 KB Created: 2021-09-02 05:44:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7b7fa17d281d6deb3443bf04942504b8 SHA-1: e6eebc3f8dd692b48b7c893393c781af1ff3dd5b SHA-256: 3f23d7d6c98e8c7df09b84231e41a6c9dd6f188419e8acacc07445c6c8419010
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS uploads. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs suggest it is designed to redirect users to potentially harmful content, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://petkasem2hospital.com/images/upload/userfiles/files/gudutevuvo.pdf In PDF document text
    • https://derechosenred.org/aym_image/files/68139824350.pdfIn PDF document text
    • http://nutricion-intravenosa.com/wp-content/plugins/super-forms/uploads/php/files/c722cbcc0e0155a3bce76381589f8e91/ximuwavonutokek.pdfIn PDF document text
    • http://utopbrake.com/uploadfile/files/56938935584.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/zivudaput.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/gewewatijufetigelekulexe.pdfIn PDF document text
    • http://at2apigroup3.com/contents//files/1067602268.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160769a26836da---10082408518.pdfIn PDF document text
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/24ccc9411104b9ab6e45bbaac8b28ba6/15069305010.pdfIn PDF document text
    • http://zhodnoceni-penez.cz/is/images/FCKeditor/File/vaxiluminapilunaxizapoxek.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/93356771401.pdfIn PDF document text
    • http://hiddencliff.kr/FileData/ckfinder/files/20210628_C33F555FD8022D9A.pdfIn PDF document text
    • https://roeveragri.ac.in/wp-content/plugins/super-forms/uploads/php/files/b36e2ffbe6a4256c52caebc2682a8746/90980224271.pdfIn PDF document text
    • http://aodaiminhhanh.com/app/webroot/uploads/files/79854008668.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/tazaripitozonifuwanimali.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607092e46aabf---petufimexixubobevipigote.pdfIn PDF document text
    • https://fotofidelity.cz/userfiles/file/noxozoxiveduve.pdfIn PDF document text
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160847e6374078---dejukawux.pdfIn PDF document text
    • https://www.singaporemedicalclinic.com/ckfinder/userfiles/files/zuboduxebelamewup.pdfIn PDF document text
    • https://yuktogel.com/contents//files/63318105989.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a789d9341ec---jokipepanidijanur.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1c5ja6adu9jvk473t65tpgnsr8/53093032056.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=hypothesis+testing+one+tailed+examplePDF 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_off0000da45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA45 10948 bytes
SHA-256: 47870827a0765675d39fb109abe9b6c3932881482dc980212c0169fd1dcb99f5
font_01_sfnt_off0000f345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF345 20112 bytes
SHA-256: fa438fb2e8c1aa039f2c6663861d2f6cd1efaffb02169b18ce11776c1e8b6351
font_02_sfnt_off00012634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12634 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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