Malicious PDF — malware analysis report

Static analysis result for SHA-256 1244ea5cee4315c0…

MALICIOUS

PDF

62.6 KB Created: 2021-09-21 07:06:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 787d0aa1181660165309cfcf5ecdd2a0 SHA-1: 5fe348715ef3761f96343d29543526a038555ef1 SHA-256: 1244ea5cee4315c0ad46d9c6c7b28a19ab255dcc02fc46c96250f5f75bbb2d70
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the structure and URL patterns suggest a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7794

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://thingsantiquesla.com/userfiles/files/nasesukaginorigifut.pdf In PDF document text
    • http://microcement.ua/userfiles/file/guzazewerelulitar.pdfIn PDF document text
    • https://wcfkenzi.com/ckfinder/userfiles/files/99992029668.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/61248307864.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/51375080803.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16136489448fa2---14205136063.pdfIn PDF document text
    • http://kozszemle.hu/uploads/files/tisokovomezijewepovazesi.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/bumolijudaripebevimin.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/mijazofakipatuvexoruroma.pdfIn PDF document text
    • http://15881588.com/ckupload/files/kowazatabetamelur.pdfIn PDF document text
    • http://www.mostex.sk/files/articles/file/wexosemu.pdfIn PDF document text
    • http://soupworld.de/upload/file/6099574248.pdfIn PDF document text
    • https://southafricapools.com/contents/files/33127480520.pdfIn PDF document text
    • http://hoaiduc.edu.vn/ckfinder/userfiles/files/tezazadinijosapaxa.pdfIn PDF document text
    • https://schodyperfekt.pl/user_upload/file/ketuvodojananu.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/96766750285.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/gexibetezusalevexubapa.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614936cf6949c---26756202226.pdfIn PDF document text
    • http://dostavkaturov.ru/files/file/dixiboxenaxezitefudi.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/71920956701.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/79126056070.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/85666448345.pdfIn PDF document text
    • https://trexanh.net/upload/files/50181321474.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/jf2ku444abr4loods7o4nrp5n4/mevebivabopakaxixuxeku.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=current+rewards+mod+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D2 10724 bytes
SHA-256: 38b10be1e6d804dc5406f64573ff68aac04340428ae5ce77f78583f4b52d647d
font_01_sfnt_off0000d288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD288 17520 bytes
SHA-256: 4c22d10e3470b2542c98f3d37fa396dbc822015bb8d814e8eaf72a2f15f4ed3a