Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0ee2557f3e526a1…

MALICIOUS

PDF

80.4 KB Created: 2021-10-05 13:36:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 85d7e5d313e62046f6b25225ef169920 SHA-1: 5c7675dd7e0730797c52a0539274338f3f581b35 SHA-256: f0ee2557f3e526a1931428a684381ba81036503ef4341b56a6dc9ab0b08e7b0a
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the structure and URL distribution suggest a phishing or redirection attack, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://weblative.com/wp-content/plugins/super-forms/uploads/php/files/lc8eees1pavu9mlfgk3ghohq2g/rasukituxojojesonirokade.pdf In PDF document text
    • http://rujiahk.com/uploadfiles/file/93980471788.pdfIn PDF document text
    • http://telecycling.info/files/file/maturetarabexababawiwesi.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/mizego.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/19406399537.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/jilexagekit.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/c1072b2cae64760cea17dd147324843b/34284030786.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614d863036f46---tojexuzijevuviro.pdfIn PDF document text
    • https://gionggiacam.com/ckfinder/userfiles/files/17685768597.pdfIn PDF document text
    • http://ngnjl.com/userfiles/files/96525051347.pdfIn PDF document text
    • https://mimpishio1bet.net/contents/files/82901231651.pdfIn PDF document text
    • http://rld-carbon.ru/file/98000397255.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/kazepatopo.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/dumusika.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/piluzagurodadof.pdfIn PDF document text
    • http://master-vin.ru/files/file/57438886006.pdfIn PDF document text
    • http://shepardinteriordesign.com/rw/upload/file/wibowezupiruxam.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/garuruwemupefopovek.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614900c392219---65545646074.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/fojigibubetanosagul.pdfIn PDF document text
    • http://oshcongregation.com/userfiles/file/sojoxajoluwivumawiturok.pdfIn PDF document text
    • http://interstyle.org/content/xuploadimages/file/76255419531.pdfIn PDF document text
    • http://bet-balance.com/userfiles/file/nababopanekepinasemizon.pdfIn PDF document text
    • http://www.lircai.com/web/inline/file/3970365999.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=greetings+dialogues+exercises+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_off0000d276.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD276 18820 bytes
SHA-256: b73f3142a5325ff33874dbedf6662da5870e16dfb5bbbe37e738f8bd883bcd40
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 11036 bytes
SHA-256: 2d4f3399fbb7d7e4ae096e64a8d4ca7ab986ae136bd6c941c2b8e41f6a06600c