Malicious PDF — malware analysis report

Static analysis result for SHA-256 db6fc45fff93c4f8…

MALICIOUS

PDF

85.5 KB Created: 2021-06-26 23:46:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 47ee1c6f6417abeafeab5afa322e5b0c SHA-1: 8bca9aa4a77101b034c50b1663ea771020e54bd0 SHA-256: db6fc45fff93c4f8cd8bbcb08cc93e7c6219c758e97abff09ea0961bc4a283a0
96 Risk Score

Malware Insights

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

The PDF file was identified as malicious by an ML classifier and contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting. These links likely serve as a link farm to redirect users to malicious websites for phishing or malware delivery. No scripts were extracted, but the structure and URL patterns suggest a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 5

  • 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://prtl.pl/userfiles/file/budizilutegovetagotax.pdf In PDF document text
    • http://cn-polylysine.com/d/files/tadalomumixedipas.pdfIn PDF document text
    • https://educhina.mn/editor/files/6704793212.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/3fce9583c977052a612be46c028985b5/62745282815.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9780a6127---xufavax.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/13b06ae1010ce11b1960f53acc33c53d/75057255501.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/593848e6b486419bf2bd54969b73cfa1/69901047175.pdfIn PDF document text
    • http://placc.info/up_image/1841290073.pdfIn PDF document text
    • https://impariant-club.ru/wp-content/plugins/super-forms/uploads/php/files/3a4782c23b32c36b37641439678b079f/89804149693.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/9cd37fddb14511a93fdb2f9e350b833d/63215363984.pdfIn PDF document text
    • https://store-connector.com/_upload_bilder/_filemanager/file/zirelimalateja.pdfIn PDF document text
    • https://cuacuonbentre.com/upload/files/woradagunalikaxikidum.pdfIn PDF document text
    • http://narcisse.sk/editor_uploads/files/towenoparosetutezo.pdfIn PDF document text
    • https://signika.pl/Upload/file/baxelumuvij.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984c522f2ea---88671593007.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/0c6aba0729eb22f66f77383e38baea52/50841173382.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/040b1cdcfef4bec3fc0443f789478f39/46108076212.pdfIn PDF document text
    • https://pellevah.com/upload/files/kadulexe.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160872c7a98f1e---86583707167.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/659494abaa0054aa68a6efd5938ee9aa/mapefuxodeka.pdfIn PDF document text
    • http://tzoetemondje.be/uploads/files/sagalogevegibafuzusadu.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c84636cd2c---tujeremefodoxemu.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7152809b2c---liwokagokomokobifinid.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=consecutive+days+meaningPDF 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_off0000eb64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB64 16552 bytes
SHA-256: 6eec8516055d93d1dd8cc7d99dc175fe2fb9cf78a6960eb948a011c02d390aa8
font_01_sfnt_off0001165b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1165B 10876 bytes
SHA-256: f69dc2123c93d0b89dc5a9e0dd85c6bbec74cf42aad2b509466a51eb4f506b7e
font_02_sfnt_off00012f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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