Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d25897ac1daf8ca…

MALICIOUS

PDF

86.1 KB Created: 2021-08-16 19:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b14db6316c0bd07d867544ee378e01b1 SHA-1: 42d376e8f83733f4193dea6cfaf8b84466633f2d SHA-256: 4d25897ac1daf8cab1b9d614eafcdef19b221413b48ac8b3cfc823408b000d9a
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier. It contains a link farm hosted on compromised WordPress sites, likely intended to redirect users to malicious content or downloads. The presence of multiple URLs pointing to file upload directories on various domains suggests an attempt to distribute further malware or phishing content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 6

  • 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
  • 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://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/160b61d901cb70---99889537288.pdf In PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a0bcb8b863f---gebezugezipu.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/82557096438.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/77521392952.pdfIn PDF document text
    • https://amerismithenterprises.com/wp-content/plugins/super-forms/uploads/php/files/e2bcb3026a2dfbc753c9c22be9e5ba76/mutesamizaso.pdfIn PDF document text
    • https://menokatea.com/ckfinder/userfiles/files/nipuvagotakipuru.pdfIn PDF document text
    • https://educhina.mn/editor/files/406639490.pdfIn PDF document text
    • http://carefirstwalkathon.com/clients/8/89/89514deb4c0e8807eb046cac28c4977f/File/kexabodoj.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/kizuzitivanogila.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4a4aaa23b2---ranimuwotemib.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090b5cd39e38---36439020187.pdfIn PDF document text
    • http://doubles301.jp/files/ckeditor/files/denoxigetuderosedusofuzob.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/ocr4ae99mq9io4867c73r34cj0/tomenonaluvu.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/15661097154.pdfIn PDF document text
    • https://baatco.com/ckfinder/userfiles/files/nosakun.pdfIn PDF document text
    • https://costabravas.com/uploads/localidades/files/fugesidozotuve.pdfIn PDF document text
    • https://florerialafloresta.com/ckfinder/userfiles/files/64058692031.pdfIn PDF document text
    • https://netlandschool.cl/files/73657750727.pdfIn PDF document text
    • http://ibtaker.ps/userfiles/file/32498866345.pdfIn PDF document text
    • https://asken.as/bilder/file/84649761202.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/94145532050.pdfIn PDF document text
    • http://mayinluatudong.com/uploads/userfiles/file/wupigu.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/31a829fc41c5dcd22f1ff273a2b2b3a8/43856173273.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+read+crypto+candlesPDF 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_off0000eecd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEECD 16512 bytes
SHA-256: ea957b6007928f636aff7123fcef5cbbefad5bfae863fcdce8611adf069fb191
font_01_sfnt_off000119a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000131b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131B8 10608 bytes
SHA-256: f3b884252f4e4ef14bdf5bc00ffd58b4aa0d5126c0c5c7a707a67351dc8e0a75

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