Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dce6bcdfdef6f8…

MALICIOUS

PDF

81.6 KB Created: 2021-09-04 06:25:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 14be1c49547ab0b996decc2792143c69 SHA-1: b1f370e4892dedee48a681b8fbdb16726e42d24b SHA-256: 63dce6bcdfdef6f829acc565cd0fb41888b5d15a7533a31f7fdd41472d2f9213
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and URL patterns are consistent with exploitation techniques.

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 https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085bdf3ae2a1---lelidarisujafus.pdf In PDF document text
    • http://www.dramayaramendes.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070c2a94eed0---gegokap.pdfIn PDF document text
    • http://donghocasiochinhhang.net/uploads/userfiles/file/39668269119.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160b8481b45cee---bolikarilibexemizuvo.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/filuxadudimito.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/10051fb373a4c63468e7143445a84c58/telisixafesaxaboli.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1612a3b1ad7438---pugoser.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/89961295965.pdfIn PDF document text
    • http://fonnepal.org/userfiles/file/43367320677.pdfIn PDF document text
    • http://montpellier-business-plan.fr/mbp/upload/images/images/upload/ckfinder/25435570201.pdfIn PDF document text
    • http://triumphtoday.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bff3f16af96---58697446375.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/1de654b0b0344978de9bd21e327892f2/jobamanumajeg.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/92215546244.pdfIn PDF document text
    • https://www.mysmilestudios.com/wp-content/plugins/super-forms/uploads/php/files/dbf1a2649958dde336e38698e43e283e/59437067620.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/59583937092.pdfIn PDF document text
    • https://nakipoglugroup.com/upload/ckfinder/files/basazironafuraji.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/melewut.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/99697285998.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/71f6f7f66fa73a2a9b355330dd4256af/nopevajej.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/zolemopobufinodifode.pdfIn PDF document text
    • https://www.techsrollout.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb19d2e110---fuxufa.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/95460182243.pdfIn PDF document text
    • http://hopkim.vn/upload/files/83831262408.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=number+patterns+worksheets+grade+2PDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/fa2cb6211568b499e3cc65c13cc7572d/runovapogoluxoduxo.pdfIn PDF document text
    • 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_off0000da0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA0B 11216 bytes
SHA-256: fc2df0ffe1a191ecdece9fd1559c7c228fcd42134c2d21ef6c73c367611bdb27
font_01_sfnt_off0000f3d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D6 17324 bytes
SHA-256: 6df7f777574f3e5862cd37bdebb22c0adfe1baffc12e01e63efdfa8de06923d6
font_02_sfnt_off000120a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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