Malicious PDF — malware analysis report

Static analysis result for SHA-256 8aca0ccc58bf5110…

MALICIOUS

PDF

74.9 KB Created: 2021-09-19 07:42:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 8c083759d83eb2eecb49f58638543372 SHA-1: 8c53cda6c0179aa24d6d174864bc917b0a3bb5da SHA-256: 8aca0ccc58bf511022e4ddcfe7b093212f3874493a3abb9774ca9d60852b135b
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external links, many of which point to compromised CMS uploads or disposable hosting. This suggests the document is designed to lure users into clicking links that may lead to further malicious content or exploits. The ML classifier strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://faptvmedia.com/userfiles/file/tozupezogigerugikig.pdf In PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/g7h925rfaqgkti5923oc24oud0/wibero.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/guxozubonowuwir.pdfIn PDF document text
    • http://elai.kz/upload/2021/09files/210904044529266122sj9hy.pdfIn PDF document text
    • https://varbackaforskola.se/ckfinder/userfiles/files/90921262421.pdfIn PDF document text
    • https://dhesient.com/media/merajelisilizi.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/74aaa5b7d33c8ebeb90ff4feca6a6546/bopovikilaferuniji.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/37344235246.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/ffd1677321f619dbae5a499c2ce01496/55853847129.pdfIn PDF document text
    • http://onlinecommerce.bg/uploads/pages/files/15777035121.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/82322549748.pdfIn PDF document text
    • https://slotpt2.com/contents/files/57126503297.pdfIn PDF document text
    • http://www.mediacomriccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1614468d979a6d---99043998.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/90407490082.pdfIn PDF document text
    • http://sinsg.com/files/fckeditor/file/27145598622.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/54148481873.pdfIn PDF document text
    • http://dunakeszi.varosom.hu/userfiles/files/zagadoxotawasarojiwaba.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/2798926c62569c9c5d07d7846bbe077a/noxabasa.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/67997669400.pdfIn PDF document text
    • https://limadelimon.com/images/file/2461190339.pdfIn PDF document text
    • https://reniuved.it/file/vatavoxokijape.pdfIn PDF document text
    • http://www.satunatc.ac.th/ckfinder/userfiles/files/fakopilemij.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/39517745484.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=war+full+movie+300mbPDF 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_off0000bd0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD0D 10600 bytes
SHA-256: 6308dffdeb92bfc03a61135571566e818d772bc0df2a7a3f7024bff60e42741d
font_01_sfnt_off0000d54d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54D 18600 bytes
SHA-256: 8aee8be99e0ee001b8869cd36eb17ed0c50ec1f3d0e037a9754c03ce431bd196
font_02_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1