Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6881a11b812d2c…

MALICIOUS

PDF

71.3 KB Created: 2021-09-02 15:23:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 98177aed582e9bece3e9aca0f7d19276 SHA-1: c112b7e48b96ed7cdf9a2df479849d6eea38f508 SHA-256: 9c6881a11b812d2cbe28c7742d6c8e62923e51187e56961b830f8f1e24472b07
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites or other disposable hosting. The ML classifier strongly indicated maliciousness, and the heuristic firings suggest this PDF is part of a link farm designed to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://casabresciani.it/uploads/file/45801345298.pdf In PDF document text
    • http://vestmorecapital.com/images/epost/48911162340.pdfIn PDF document text
    • http://soupworld.de/upload/file/denekuwudu.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/ae8d276c07b1c61e10a2f664a5b23f04/gixigekimosezafamixulu.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/japo5gl4meink4t8gua4jvgrb4/wezagedaramutagojusexamaw.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc854c0ad4---mimufonebebez.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/dodoguwunilopix.pdfIn PDF document text
    • https://wills.sg/wp-content/plugins/super-forms/uploads/php/files/ce3e2182ca8d2e964df35b7a4659578a/zilogabatuf.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/12890150514.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/i9nbulllk3c6nkaopa2ni0umn0/fenewuxukoxesukevenare.pdfIn PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/fa597b202957a0fdb15acea10bffc502/lekofiboduxu.pdfIn PDF document text
    • http://mkconline.com/landmark/ckfinder/userfiles/files/luruzadomexisixub.pdfIn PDF document text
    • http://hondasushi.com/uploads/files/66356404728.pdfIn PDF document text
    • http://adacu.org/userfiles/file/20210621055717.pdfIn PDF document text
    • http://accessiblevehicleservices.com/userfiles/file/19542326756.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/38386685008.pdfIn PDF document text
    • http://argra.rs/wp-content/plugins/formcraft/file-upload/server/content/files/160a88ba71c175---13883877034.pdfIn PDF document text
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/8c8cfe853e44fbed5b7f001a8ad176d6/jebobikif.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///matitewevafivuposupo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b499a116ec2---mamugofokelor.pdfIn PDF document text
    • https://tavcam.com/upload/ckfinder/files/43600738804.pdfIn PDF document text
    • http://nacnsuaa.com/clients/4/49/49ab1acc6c62b5a39110d621a19f71c0/File/34391093545.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b6ad9c04c---38560951108.pdfIn PDF document text
    • http://hoadon-dientu.net/images/files/mazepawuda.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/dde3fe34eeb526945293459ff99ac688/19166626461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=12th+cbse+chemistry+solutions+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_off0000b7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7F6 14924 bytes
SHA-256: 636cf6d1513ae7110869770dc6c1c36d6fdb6cc851b88ced4d7e26e1b71c8a7d
font_01_sfnt_off0000dd6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD6A 11152 bytes
SHA-256: e0b7478199b50b2455aa7880cf867caed76d2e5aa9e0c1c550f1afce0fafb482
font_02_sfnt_off0000f724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF724 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1