Malicious PDF — malware analysis report

Static analysis result for SHA-256 c044f44c18b0f7fb…

MALICIOUS

PDF

62.3 KB Created: 2021-09-16 01:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f2c22a21a195792b5f2e76c612ae1118 SHA-1: 5b3b286301ee7902a9b16ddc9c7eddc39b64dc92 SHA-256: c044f44c18b0f7fb4d0490335b15d895007fb25f7c563dc1d40f5d6e4e071128
154 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous embedded URLs pointing to potentially compromised websites and disposable hosting. These links likely serve as lures for phishing attacks or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5125

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 http://zoldjogsi.hu/uploads/files/10825636290.pdf In PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/72bv9ei6fr5pi0v193he0k7t54/64857692089.pdfIn PDF document text
    • https://veaodaibrahma.com/uploads/image/files/91122693433.pdfIn PDF document text
    • http://dominoliberec.eu/images/file/files/nepuxazenev.pdfIn PDF document text
    • http://antwerp-rentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a9d5170c1---fexurewinalixetepebumaf.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/48671940100.pdfIn PDF document text
    • https://majubesar.org/contents/files/21882605793.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/161383a3b662ee---87937725981.pdfIn PDF document text
    • https://munis-roquesalbes.cat/demo/vilalba/imatges/file/fuwafotelenubik.pdfIn PDF document text
    • https://equator-maritime.com/userfiles/file/26541267833.pdfIn PDF document text
    • http://wideanglepackaging.com/ckfinder/userfiles/files/53248613490.pdfIn PDF document text
    • http://ihanzao.com/userfiles/file/20210907123236_1057270535.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/20485804018.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/mubapipaguw.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/xibikuleloz.pdfIn PDF document text
    • http://henca.com/files/details/file/gavutizatalo.pdfIn PDF document text
    • http://dfanchem.com/upload/files/21741026239.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/sanug.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/kopaniguwamuguxuv.pdfIn PDF document text
    • http://cachnhietcacham.vn/Images_upload/files/nilebesawubuvix.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/1613c933528f7e---99903937294.pdfIn PDF document text
    • http://www.golfusa.be/userfiles/files/86475448269.pdfIn PDF document text
    • https://swagath.co/new/ckfinder/userfiles/files/pesomudomewo.pdfIn PDF document text
    • https://www.leasing.net.in/ckfinder/userfiles/files/65069133934.pdfIn PDF document text
    • http://elfobchod.cz/foto/Image/file/kobitudosam.pdfIn PDF document text
    • http://sportsclinicwest.ie/media/contents/file/pizewa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=root+browser+pro+downloadPDF link annotation
    • https://www.posluh.hr/ckfinder/userfiles/files/13193256633.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_off0000dfde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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