Malicious PDF — malware analysis report

Static analysis result for SHA-256 c516f16c40ed7b47…

MALICIOUS

PDF

72.2 KB Created: 2021-09-06 02:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6181a4592037c2df08677131414494b1 SHA-1: cf686ac02e79c8c09e9f13f1d0f690eccd3f2ff3 SHA-256: c516f16c40ed7b47adf9e4b6c2626715416cdf0941c7adfd64e8f337cf6b675c
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document exhibits characteristics of a link farm, with numerous external URIs pointing to potentially compromised or disposable hosting sites. The ML classifier strongly indicates maliciousness, and the presence of multiple links to external resources suggests an attempt to redirect users to malicious content or for SEO manipulation. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://cathugo-catamarans.de/res/wysiwyg/file/76405773934.pdf In PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ec537a4bab0---49903094421.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27cbd660ba---lusuge.pdfIn PDF document text
    • https://ladulceseguros.ar/noticias/fckeditor/file/xodexexamufi.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087a6c9a25f4---70148097240.pdfIn PDF document text
    • http://gld-lining.com/user_img/files/soxupotadakafitusenawaba.pdfIn PDF document text
    • https://www.webplease.it/wp-content/plugins/super-forms/uploads/php/files/iej4pea9th746uh71o5oit3tkv/xelulujawagewukidukobobe.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c27047ef66e---79047365013.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/92678524296.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/rosurejasovezogumiribaj.pdfIn PDF document text
    • http://www.sphotobooth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160768ca898754---72931168406.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/gusupezofamojexigok.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/96c9f3e96172a32e68a2fd293a1f6036/zujizutatujujupole.pdfIn PDF document text
    • http://dirpub.org/editor/ckfinder/userfiles/files/37235915286.pdfIn PDF document text
    • http://kimbuunguyen.com/uploads/userfiles/file/18514206381.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0392be837b---84766948495.pdfIn PDF document text
    • http://fitviewer.biz/files/file/doxijeloxegigega.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/24380800408.pdfIn PDF document text
    • https://www.wappa.com.au/siteadmin/ckfinder/userfiles/files/mebanuvesagojib.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/kawakutov.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a2b0d77c131---zinuwedizofopi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=cessna+150m+maintenance+manualPDF 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_off0000b757.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB757 16720 bytes
SHA-256: 84577a1d0695fe0090085de8f6eb64ed16b7d3e67e835444d63c30058250cdcf
font_01_sfnt_off0000e257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE257 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6E 10612 bytes
SHA-256: ccf5e43cff726efd4b6316215eb90f6834d5236a825b2724104c2ce100ea65ab

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