Malicious PDF — malware analysis report

Static analysis result for SHA-256 25c012358323ec03…

MALICIOUS

PDF

62.5 KB Created: 2021-08-05 01:15:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c753474df764c98ec1c1a3f60922a0f SHA-1: bdf5a30389cb31afec8822039a234ad6021e6e0a SHA-256: 25c012358323ec03a0da83aa0d435cccb276428f4614c5d07b26b439031dca64
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the nature of the heuristics point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9446

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://nomylo.ru/uplcv?utm_term=sample+employee+reference+letter+for+uk+visa PDF link annotation
    • https://branchennachweis.eu/userfiles/file/74684628343.pdfIn PDF document text
    • https://webupdate.ca/wp-content/plugins/super-forms/uploads/php/files/b3insa1t54hhp0jdvhrlf7hvhi/38232970083.pdfIn PDF document text
    • http://allaboutdowney.com/userimages/96635275741.pdfIn PDF document text
    • http://orthodoxvaidikasanghom.org/userfiles/file/26407612900.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606e4c557412e---92127648459.pdfIn PDF document text
    • http://lussoleathertiles.com/test4/EDITOR/example/v2/userfiles/file/debujiwawagomib.pdfIn PDF document text
    • http://security-m.jp/tool/images/file/jujud.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/lubixikirulutunubow.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/88514037715.pdfIn PDF document text
    • https://benqmusicworkshop.com/fupload/file/xijegatiniwudewanenaworo.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdac9eb9ebc---10552348414.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/26513742633.pdfIn PDF document text
    • https://justbuymeds.net/userfiles/file/wovas.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/tc7rr2lhfuunnqvjala79agfij/1256842860.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/160fab8254fbda---82545237485.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4d09e0d4b---68892451606.pdfIn PDF document text
    • http://techbis.pl/files/file/sugimasu.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/retolodane.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160cb3d2195743---joveba.pdfIn PDF document text
    • https://thieumaunao.vn/workspace/develop/uploads/ck_upload/files/45315467514.pdfIn PDF document text
    • http://www.chicagoalphas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608227988b9c9---latinutetuse.pdfIn PDF document text
    • http://www.yeosung21.or.kr/ckfinder/userfiles/files/1626481694.pdfIn PDF document text
    • http://serting.eu/userfiles/files/8409286255.pdfIn PDF document text

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