Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ad8dff69bec553…

MALICIOUS

PDF

94.1 KB Created: 2021-09-07 05:13:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 863124186bddf4e205870e22f0e26295 SHA-1: badee9dc0ac2503c6471a52cc260c07500102e7c SHA-256: a6ad8dff69bec5534175606db83205047aa291b69a268075e1f79d752ea1461c
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to lure users into downloading further malicious content or visiting phishing pages. The ML classifier strongly indicated maliciousness, and the presence of numerous links on potentially compromised CMS uploads reinforces this assessment. No scripts were extracted, but the structure suggests a downloader or redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://denki-shonan.com/uploadsfile/dovosigalowavelimanad.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/e66521cb278655fdae626145486d9a5a/gesiwibozikakeparux.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092b7278956c---36312458569.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe3bb9e55---94335460531.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/84984297634.pdfIn PDF document text
    • https://igk-lilienthal.de/downloads/wuwakalenalazomarugexuxi.pdfIn PDF document text
    • https://ddmmaze.altruistictech.org/documents/img/upload/files/20831320944.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160811d09c02b7---guduzatotojipadumagomarol.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/6cdd07670897f2cb3a2dc788b29e2134/46258528960.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/38014988833.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/76c2aa5d5a2fd98cd2575855cafd3bf6/47929060252.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/25513058785.pdfIn PDF document text
    • https://congthuonghotel.vn/app/webroot/files/images/pages/files/wetesifulijegogujal.pdfIn PDF document text
    • http://hhs63.org/clients/8/88/88ec95b665b56da82b1de85f097fba10/File/gewizinonijulezuv.pdfIn PDF document text
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e30a1c899e---39638680400.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5686f2b1d9.pdfIn PDF document text
    • http://tgroupsrl.com/userfiles/files/12070968295.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/30abd065fa118eb7ae79915e1a5076f9/gojowijusovubez.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/32528971734.pdfIn PDF document text
    • http://emachn.com/data/attachment/file/76211899848.pdfIn PDF document text
    • https://ag-concept.ru/wp-content/plugins/super-forms/uploads/php/files/0eb1af562128a69f5d390edc3c69e579/39797275532.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160bd158dbc515---22655573847.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16095e75cd9caf---81817017731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=history+of+the+philippines+timeline+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_off00010ab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000122c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C5 18404 bytes
SHA-256: a0f3ef73a5f8394772b678fda31c038a1d8d9a725a82cc8aba77e5db060e0986
font_02_sfnt_off00015252.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15252 10704 bytes
SHA-256: 5c097e0d602587cfa980123c52d585e49f94bd38ad7c2223c02fc6d8388f18a5