Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa7befec0c2ac42d…

MALICIOUS

PDF

84.2 KB Created: 2021-06-26 18:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 07eaa793333588c40a8cb84d5675b163 SHA-1: 0cb4702e1f38de39d1b3181743c75d8cab3fe987 SHA-256: aa7befec0c2ac42d11d48d7e639652c49a0223d537806d80031ca82d7cb54384
96 Risk Score

Malware Insights

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

The PDF file contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious destinations. The ML classifier strongly indicates maliciousness, and the presence of multiple PDF link farm heuristics reinforces this assessment. The primary goal appears to be directing users to external sites for potential phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 http://vijyaiprismcrm.com/userfiles/files/7127419191.pdf In PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/00abf8105639efa742a174d3aa88289f/pesofipuwelekuser.pdfIn PDF document text
    • https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca50760a3c---vowemodevel.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4e514f1d4---11614839286.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/1bu35sdmfllgom94aff3qj01pm/jetoturopikun.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/buwujabusil.pdfIn PDF document text
    • https://advik.net/userfiles/file/mulazozozu.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/drn4qmmtet1ih68u4tbko30913/zapikazupifabeme.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a401cee72af---92577825639.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f4959eb03---kubexudamowamefugod.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/41122431991.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/xaxaxutu.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cd797a2adaf---14103030476.pdfIn PDF document text
    • https://sellerflows.com/wp-content/plugins/super-forms/uploads/php/files/2894bcb11813d35bc145a3b9413e9a30/15845682992.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/7a129aad218321a688e949e810f415f9/losoderulinaramonedu.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/51fbf4900b55a68d896064b30cf5acd8/xagawoxobelibit.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/xorodewaxapisa.pdfIn PDF document text
    • http://aire-limpio.com/img/editor/file/pesufa.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/6p1v0i6pbhgld2jbre00nq8he1/42792374957.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/30305894387.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f243f25574---58587398210.pdfIn PDF document text
    • http://griswoldremgmt.com/uploads/files/43386457154.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/334aaa6943c4bb20d706bdcf74e348b8/64586339082.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f8b7c034d9---lanarorovipabufemewofetun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=weaning+1+year+oldPDF 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_off0000ea78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA78 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001028f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028F 10316 bytes
SHA-256: f3f53be4351aa204d4a15a97e6d20a85d43a9f9d56478ead73ecbfcff28d8710
font_02_sfnt_off000119b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B7 16224 bytes
SHA-256: a8ccc1d582ffd51695200efc7c8f5da7703fa620c1e8edfa6804e4f21e9dad22