Malicious PDF — malware analysis report

Static analysis result for SHA-256 3466200264b51573…

MALICIOUS

PDF

82.6 KB Created: 2021-09-12 13:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9f51f34c05b0c711e4aec70ae968c631 SHA-1: 912d5c53b1a622a3937740635ad9aa15ed63e0c8 SHA-256: 3466200264b51573a7d4a55b32e9dcf152ef660ac17582dbe9d0c800d67b8177
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or distribution mechanism. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were extracted, the structure and URL patterns are indicative of a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://www.verneteco.com/ckfinder/userfiles/files/65875719664.pdf In PDF document text
    • http://damutech.kz/upload/2021/09files/210910093457187973bzfi2.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/vanegugetorogokefikowoki.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/12213753899.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/vudoruwofiretudi.pdfIn PDF document text
    • http://aedjtjdshbf.pretty-match.com/upload/files/89950173726.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/21cb7f208051816ae20f8b8aebd6d656/lumixovibolunanegegak.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/87746b5d3cefcdd5ab7ccb8937469ca1/18273615074.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d7566130d3---nufesebogusojodalewuje.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/rejitowuwawa.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/9e01fc4bd1ac07463319c48c9e694405/samerufikakobezesan.pdfIn PDF document text
    • https://shunnasato.com/xegaruratigerib.pdfIn PDF document text
    • https://nabil-doukali.com/userfiles/file/bujuboxudap.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613621cfca908---sibodinerok.pdfIn PDF document text
    • http://lonerangerfanclub.com/ckfinder/userfiles/files/pulomusu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138e89810c8d---7095263268.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/46542157265.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/gixafogixufisow.pdfIn PDF document text
    • http://gerocuki.hu/user/file/54473410768.pdfIn PDF document text
    • http://opersan.com/file/4549138429.pdfIn PDF document text
    • http://location-appartement-venise.com/italie_documents/files/53892555644.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/46901485806.pdfIn PDF document text
    • https://kham.vn/userfiles/file/sogabagesowesoxizibo.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/97527141787.pdfIn PDF document text
    • https://aannemingsbedrijfbarthulsbosch.nl/userfiles/file/lexevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=transfer+data+from+internal+storage+to+sd+cardPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 17740 bytes
SHA-256: a279d7e0d7cedf7045719716abf2e3559308510d1cabcffbf3532d32caab9fde
font_01_sfnt_off00010b63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001237a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1237A 10780 bytes
SHA-256: 20a09ad270596c4c50c69cef1a1eacc60b2307b3a03f3d6998d38a48e376c504

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