Malicious PDF — malware analysis report

Static analysis result for SHA-256 a35d6720b439e933…

MALICIOUS

PDF

64.0 KB Created: 2021-09-21 01:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 21af5a6720aba5c68653bf9e7481e7f0 SHA-1: 2433f20d25909991237f6c540179643c282663bf SHA-256: a35d6720b439e9336d5e4082b5d7fb5faa8765fe50df313c0d35fa956245c42b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains numerous external links, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The primary function appears to be redirecting users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6381

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://garglob.ru/uplcv?utm_term=upx+proxy+website+browser PDF link annotation
    • http://bbfederico2.net/userfiles/file/19528012350.pdfIn PDF document text
    • https://dulsuc.cl/userfiles/file/lejipafov.pdfIn PDF document text
    • http://sevinctekstil.com/resimler/files/91440766536.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/1c9f0e54433cebab47681b7efc913bac/vanukif.pdfIn PDF document text
    • http://gdlejia.com/uploadfile/files/20210905_070609.pdfIn PDF document text
    • http://bwlpsalisbury.com/uploads/files/fatoso.pdfIn PDF document text
    • https://dichvuketoansg.com/luutru/files/gusig.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/zigigemuzafedixof.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/17534954370.pdfIn PDF document text
    • http://lifeline-sports.com/files/file/kijupefilesowi.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/36927225465.pdfIn PDF document text
    • https://kuraniterbiye.com/resimler/files/40723027059.pdfIn PDF document text
    • http://pileki.com/imgup/file/vomobuvewutabijotimi.pdfIn PDF document text
    • https://cosonnguyenthanh.vn/webroot/userfiles/files/88395925840.pdfIn PDF document text
    • https://rafaellopezehijo.com/upload/files/dokinofujakop.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/gulurasokibobiwawukemilo.pdfIn PDF document text
    • http://abwmercury.com/uploads/files/52202442176.pdfIn PDF document text
    • http://handsonmontessoripk.com/userfiles/files/ronunuwed.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe4e445078---zuziwisalago.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/39854707a890e901d9fdab8ab8aaf4ae/bigaribumozikuwosa.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/xowasotu.pdfIn PDF document text
    • https://charlesstreetvideo.com/userfiles/file/21382160725.pdfIn PDF document text
    • https://trucraftsmanship.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5b6b1db5d---22015928191.pdfIn PDF document text
    • https://nhaccugiare24h.com/uploads/userfiles/file/xigef.pdfIn PDF document text

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