Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ec862b60cd91b12…

MALICIOUS

PDF

60.9 KB Created: 2021-09-08 19:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6411823d7f4facb106853e13a22ff72e SHA-1: 2a81fec0b28b717e55699db4e88916590d3f6870 SHA-256: 4ec862b60cd91b12e55d48663973dc6953ed9298c39cf366ba02918c3385c218
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to lure users to malicious sites. The ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support a malicious classification. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's intended to facilitate phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7193

Heuristics 5

  • 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
  • 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://infrive.ru/uplcv?utm_term=underwater+architecture+pdf PDF link annotation
    • http://tamphuhiep.com/Images_upload/files/62482062388.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16138c00b35c25---sowuwutewubop.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/rugadalulefipig.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/nudikumowamubekatibufub.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/74450182846.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/bijomumerubuziwejora.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613264bd61675---1983092759.pdfIn PDF document text
    • http://xn--80aaffebba2apgigwiiececnggk9e4k.xn--p1ai/pict/file/nikolomadesizekavazew.pdfIn PDF document text
    • https://ww150007.linebot.net/upfile/files/20210903064613.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/foxitom.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/tufider.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/20070564150.pdfIn PDF document text
    • http://patrick-vallot.com/upload/files/naxet.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/04/file/sudabopupola.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358bd389ce---40153287486.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/54450175540.pdfIn PDF document text
    • http://computerdoki.hu/user/file/lapumikiwewowevibadavu.pdfIn PDF document text
    • http://rtm-plus.ru/ckfinder/userfiles/files/sibelowikovamabudomizabi.pdfIn PDF document text
    • http://brodart01.com/wp-content/plugins/super-forms/uploads/php/files/3r5kmg9hpf24hbka5fdedtf54k/kizakeluvewupokukesapim.pdfIn PDF document text
    • http://changrung.com/ckfinder/userfiles/files/jarepabaxa.pdfIn PDF document text
    • https://amoslodge10-org.alljobsinliberia.com/ckfinder/userfiles/files/41625537404.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/69440133821.pdfIn PDF document text
    • http://cwpni.com/userData/ebizro_board/file/41877516.pdfIn PDF document text
    • https://vpmemorial.net/images/file/36325692614.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF92 17492 bytes
SHA-256: 259896b25f2995e35113c2918cc3ba5b486da2cd1c018abe09f6048278de85be

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