Malicious PDF — malware analysis report

Static analysis result for SHA-256 d011cc9eccb48642…

MALICIOUS

PDF

79.2 KB Created: 2021-09-03 17:49:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: aafd45b1a566d27baecb9e77b4289e82 SHA-1: b957e1e03b79ec1a976e2eb658228c7c52583c86 SHA-256: d011cc9eccb48642f7da5c8606ed05785408aee75b5cefa0687c5371c35cac47
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users. The ML classifier strongly indicates maliciousness, and the presence of multiple external URIs points towards an attempt to lead users to malicious content or phishing pages. No scripts were extracted, but the overall structure and URL distribution are indicative of a phishing or malware distribution lure.

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 https://oniceh.ru/uplcv?utm_term=converter+para+pdf+editavel PDF link annotation
    • https://perfecthospital.org/FCKeditor/file/79336651149.pdfIn PDF document text
    • http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/8af4185e7c41b152a23640e689f2aeb8/subexozumiv.pdfIn PDF document text
    • http://stefanourso.com/public/userfiles/file/74280513003.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/modunutigemazopebofejen.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/uvcg9g92mkvfo0mt23j2si80f1/nujolizujegamevofo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d7ade768061---gabemozage.pdfIn PDF document text
    • http://aksaxena.com/bpms/includes/fckeditor_uploads/userfiles/file/pebujebazuwolufuv.pdfIn PDF document text
    • https://2ruoteexpo.it/ckfinder/userfiles/files/puneku.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160fd2cce87508---79920705800.pdfIn PDF document text
    • https://nnkcreations.com/userfiles/file/lowibafuxovo.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/zujofusunaderisanenuweg.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/314dbd874b263f7f14abfc364426e09a/jazajoz.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075d9f681ae6---zoxexedirogepogila.pdfIn PDF document text
    • http://jagatjyotischool.org/jagatjyotischool/userfiles/file/belawufebakiv.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/q9qs73uhtah5unjek53bkdsg06/kavonu.pdfIn PDF document text
    • http://fitviewer.biz/files/file/48627748376.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/muzevodiseginoripofopak.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/vuduzojavaku.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/87972365602.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/31334578279.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/b2a2c735a429b2c47416995d0d4afc64/pugojawenux.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160bdfc6af3fbd---21225159848.pdfIn PDF document text
    • 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_off0000d06d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD06D 18148 bytes
SHA-256: 39b257e8cf9173a0e903542d11cd22c9d1151e07c0c67291dbe3397b44ba0086
font_01_sfnt_off0000ff75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF75 10420 bytes
SHA-256: 6b24cd9a3382b814d05a554625798f73d9f482fa5c737bcf835a90a561f1bcfb
font_02_sfnt_off00011737.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11737 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1