Malicious PDF — malware analysis report

Static analysis result for SHA-256 c02c0c05ebbd21da…

MALICIOUS

PDF

82.1 KB Created: 2021-09-17 21:45:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 91a0502650d2e5cd406bb3a7518eef80 SHA-1: 107018886963650e2e91110ba3f8956b36f34abe SHA-256: c02c0c05ebbd21da5c00d67ec8c39d85997bdc451de4198b1e34720b730dff4e
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or trojan payload. No scripts were extracted, but the PDF structure itself is used to host and distribute links to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aleshashop.net/uploaded_files/userfiles/files/dekusexixezutulite.pdf In PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137764fc3315---97236276628.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/161417dba9f89d---95558691939.pdfIn PDF document text
    • https://ppkh.net/userfiles/file/68872607717.pdfIn PDF document text
    • http://studioferrato.it/userfiles/files/tebesutibiru.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143466a33111---43047245105.pdfIn PDF document text
    • http://dvg.asia/ckfinder/uploadfiles/files/piwapogug.pdfIn PDF document text
    • http://brixtontaxi.com/survey/userfiles/files/26869964209.pdfIn PDF document text
    • https://braus.uz/images/shared/file/pixum.pdfIn PDF document text
    • https://legacydockandmarine.com/wp-content/plugins/super-forms/uploads/php/files/554e8eb10128c0e93b2928a804d3a239/zurotizudib.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/9a25803145544fd443bea0fdceb6af09/notivuriw.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/37221095759.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613a481500bf9---vuxulutubojadaduka.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/34431846140.pdfIn PDF document text
    • http://cwesp.biz/upload/file/makifat.pdfIn PDF document text
    • http://dongsimkindergarten.com/upload/files/94270352133.pdfIn PDF document text
    • http://vipacademy.org/userfiles/file/25058012163.pdfIn PDF document text
    • https://stka.gr/ckfinder/userfiles/files/memawoxoxozoruxozuwisifa.pdfIn PDF document text
    • http://bodamvientin.com/uploads/userfiles/file/jovadonerujowupuduzidokag.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/8352746620.pdfIn PDF document text
    • http://fatename.com/uploads/files/202109172018437185.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/nabovuzuzub.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/79082320909.pdfIn PDF document text
    • http://tangneylaw.com/admin/images/file/gavuruzuladodozutob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=telecharger+jeux+candy+crush+saga+gratuit+pour+androidPDF 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_off0000d906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD906 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF118 18208 bytes
SHA-256: df8f29072d4b8fbd07444978519bb9e9401f8de22ed5751580fd0c5dc6f02e03
font_02_sfnt_off00012031.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12031 11200 bytes
SHA-256: 72d7151be9ff12a0f159fa7371726c299b5fccefd39e3fb18fb4c2ce5cec494c

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