Malicious PDF — malware analysis report

Static analysis result for SHA-256 35f3bad972339d29…

MALICIOUS

PDF

47.7 KB Created: 2021-08-09 16:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5712cac1715cff0cedb26a315b11400b SHA-1: 783fe349abe0b1bb1f8fdc984529c085ccc6b29d SHA-256: 35f3bad972339d291782bf16175699fa5df2ae1fae41231101d95269781be0a7
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7441

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://biondiairsystem.it/userfiles/files/rotesesavozemelevegeso.pdf In PDF document text
    • http://minhphucvietnam.com/uploads/userfiles/file/12328555963.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/84212020286.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609b009cd4355---duvetuxuvovarabedo.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/siteditupom.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160f1eeffa3e2f---ruvojadipotutep.pdfIn PDF document text
    • http://ladue69.com/clients/876446/File/12497540853.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/sprn3tn6fsvojpqi4skcnqrjv6/baruvo.pdfIn PDF document text
    • http://elazentrale.de/images/uploaded/file/xujamesitexawiwuroxudi.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6119791ee---gomedunajibawu.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/21653441536.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079ebee35354---xajeliloruwitezabulivo.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/887074a3b17f2d6810d9ef696488490a/41885511462.pdfIn PDF document text
    • http://astro2sphere.com/admin/images/file/77950023975.pdfIn PDF document text
    • http://circuitoinsulargc.com/documentos/file/5406690117.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081aec3ef994---17403857764.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/5e04b93d9bb896435ba276bde01abaf6/83436235861.pdfIn PDF document text
    • http://juha.be/_files/file/24363357703.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/67c6f1110f2d8612d94fc9ef0ff6e9f1/35837901243.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16073a0068285c---20395148938.pdfIn PDF document text
    • http://lacyfamilyunity.com/clients/2/20/203fd950dafdada58ea32e7b96f0d147/File/damasijiwipaz.pdfIn PDF document text
    • https://aulacvn.com/upload/fck/file/91703762423.pdfIn PDF document text
    • https://kristinanamaste.eu/files/fuzuwoduvobi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=geometry+problems+and+answers+grade+9PDF link annotation

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