Malicious PDF — malware analysis report

Static analysis result for SHA-256 4edfab54ad290e48…

MALICIOUS

PDF

61.8 KB Created: 2021-09-27 07:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 0a72952d760710565c929561eed1913d SHA-1: ff3159e4eb5313933b514bb5f92c5b51cfda1864 SHA-256: 4edfab54ad290e48491edb5793a4eb944dd14fa3dd2b5967b1f710e6d6067e9a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to domains flagged as compromised or disposable, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of external links and the nature of the heuristic firings indicate a potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7129

Heuristics 5

  • 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
  • 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://npi-management.com/ressource/site-image/files/65422690055.pdf In PDF document text
    • http://stfurnimart.com/file_media/file_image/file/dagepasikevufutudaxuxuruf.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16140babf1a2a7---fazokuwun.pdfIn PDF document text
    • https://kpii3yaw3-7nc.com/contents/files/jolumunukutobite.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161412884bb150---79343961788.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/legujuvazusebejinibezip.pdfIn PDF document text
    • http://fotofolliasanlazzaro.it/userfiles/files/nawabov.pdfIn PDF document text
    • http://proxkimya.com/resimler/files/20775493845.pdfIn PDF document text
    • https://dhins.com/testingsites/advantage_aviation/assets/media/file/54434308846.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/10998929121.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/fukevenosekakabezazuke.pdfIn PDF document text
    • https://www.hotel-restaurant-plainfaing.fr/ckfinder/userfiles/files/46429722319.pdfIn PDF document text
    • http://onlinepravenconsultant.com/uploads/wysiwyg/files/882686057.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/loberopil.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/98595353375.pdfIn PDF document text
    • https://pottoka.info/files/galeria/files/50508566458.pdfIn PDF document text
    • https://oreopay57.com/ckfinder/userfiles/files/bexiruwinup.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/16736949025.pdfIn PDF document text
    • https://bgg.pirkitpadangas.lt/ckfinder/userfiles/files/rafizubazugeg.pdfIn PDF document text
    • http://studiorumeo.it/userfiles/files/nadajufekatudot.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/44b8f5f0b47e76354ac6a6f531edec3e/78524914773.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/70334130091.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=html5+css+javascript+pdfPDF 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_off0000af96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF96 10744 bytes
SHA-256: 7f83a1c61c2064352a9a5cfdcd0fb249a10ed7e7aa9cef5fea470102269c796e
font_01_sfnt_off0000c84b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC84B 16920 bytes
SHA-256: 626d2e795c9cb1d2fd4e918eea8cfeb41b240547d713fdc7aef91c88ba943aef

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