Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e247ec4301c1af4…

MALICIOUS

PDF

75.9 KB Created: 2021-08-04 04:29:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 56845b2eb5bf0d06a8bd22d00c7399d1 SHA-1: cf4bdf3168212998670a85c1d6425673ab34ba10 SHA-256: 3e247ec4301c1af4914d3b58b10f9f005ce4850b1e2b1a9ab08016f5cd7b7975
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links pointing to compromised websites and disposable hosting, indicating a link farm designed to redirect users. The PDF structure and embedded links suggest an attempt to exploit users by directing them to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://cwesp.biz/upload/file/vebopedasakipi.pdf In PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/babawiregapubodowimase.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bafd8bfbe---43015935564.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094dfb181717---65013495514.pdfIn PDF document text
    • https://immobilgold.com/file/letenep.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd393203df---54412554053.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160afd1ac5ac6a---27399877298.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/juvevu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160816d80053a2---8748122774.pdfIn PDF document text
    • http://thuephotocopytaihanoi.com/upload/files/pumemadaranelajasozojiwam.pdfIn PDF document text
    • https://www.nhabe.com.vn/ckfinder/userfiles/files/vuvawokudunavamemiredi.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080ec24eddb4---zududinalitebi.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/b35162a42421454336ea6cb8dd844321/92244285900.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc0cf6a7355---11906360687.pdfIn PDF document text
    • http://szpk.hu/_user/file/fejoxevozokimikojopopoduv.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609413f788edf---35208513058.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/44530827633.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/48483280618.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d87b888bd1d---91496087822.pdfIn PDF document text
    • http://az4group.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160af49ee6ad8b---dijemugu.pdfIn PDF document text
    • http://www.kinoimaging.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160d1948df0176---napazufipe.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/160992806b6cad---30172095336.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/2266603289.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=sri+durga+suktam+telugu+pdfPDF 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_off0000c0ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BD 18100 bytes
SHA-256: cd2789be7d5f9a0deddd555e3a6782ef21d1da1e646ee1f0a7fd618e4af2706e
font_02_sfnt_off0001067f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1067F 10884 bytes
SHA-256: 4c5a7eb3f667cf2de89526f10073c3a69e192c3fb2c38976db6a31461bec9984

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