Malicious PDF — malware analysis report

Static analysis result for SHA-256 c533815d98a9d774…

MALICIOUS

PDF

59.1 KB Created: 2021-10-08 02:09:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 2e15b2070435afb5b28b1daeb03f8961 SHA-1: 01c895356d952bbb6a3f97cac956d80d2b06616b SHA-256: c533815d98a9d774f208d5a35396ffe291e2836284622d22c31e1df89fbc2fd3
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple links pointing to compromised CMS upload storage and disposable hosting suggests a phishing or malware distribution attempt. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6260

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://unicorn.mn/js/ckfinder/userfiles/files/nutasiloxonikupit.pdf In PDF document text
    • https://perfecthospital.net/ckfinder/userfiles/files/belijutasogineviki.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137a8fa32493---vilagibavegezigivulez.pdfIn PDF document text
    • http://iphonedown.com/ckfinder/userfiles/files/49121665552.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/zijaludewivijupadal.pdfIn PDF document text
    • http://15441707.com/data/board/file/20211007101338.pdfIn PDF document text
    • http://honmamon-s.com/img_seminar/userfiles/file/43308033078.pdfIn PDF document text
    • http://lesbambousbleus.fr/ckeditor/upload/files/dojofobixanebonokuzowam.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/37967546271.pdfIn PDF document text
    • http://tinavaron.com/ckfinder/userfiles/files/25376913812.pdfIn PDF document text
    • http://mai-colle.jp/userfiles/file/47474854957.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/88dd791965ec4421ecbfa8c95ab5a7ac/56729306603.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/12415029183.pdfIn PDF document text
    • http://julianina.de/upload/file/5960568721.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/2eee989bd080da25bfd21caaaa700b17/29512029136.pdfIn PDF document text
    • http://domkomplekt34.ru/attachments/file/24925474241.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/tageduzowipozim.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/86254098124.pdfIn PDF document text
    • https://kildevangen.dk/files/30613633629.pdfIn PDF document text
    • http://tsg-vaganovskoe.ru/ckfinder/userfiles/files/fitot.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/kefoxeporelibupemi.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/6683f7d75a7af3ceb77ef2c88a7bbc50/bumeb.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/e7f9a333592df594dd20540bf51e31e7/simaritagoborumunogizizir.pdfIn PDF document text
    • https://rolcsi-bau.hu/userfiles/files/mubisafebesatidizarula.pdfIn PDF document text
    • https://foodexgida.com/uploads/files/nifibamejurobiriratobevit.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c06857b7c3---jewolatimobuparujes.pdfIn PDF document text
    • http://195exim.com/datas/files/bijodadoganavos.pdfIn PDF document text
    • https://demo-calson.garment-pro.com/ckfinder/userfiles/files/rodoxovev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=canal+boat+racingPDF link annotation
    • 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_off0000cc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1