Malicious PDF — malware analysis report

Static analysis result for SHA-256 ebea43162f6074c9…

MALICIOUS

PDF

76.3 KB Created: 2021-09-04 03:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ed8b75e6edbc7c5b650a062c1fd9acae SHA-1: 0141e02ca25119998b1d813ab6ea53ce7f66789a SHA-256: ebea43162f6074c9f6d8cdf466f8d4005fac2d2183672972607e1e3e4aec89a5
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by an ML classifier as malicious. Heuristics indicate it functions as a link farm, with multiple URLs pointing to compromised WordPress sites and disposable hosting. These links likely serve as redirects to malicious or phishing content, a common tactic for initial access.

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 http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07b25477c2---dudiridilin.pdf In PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/648eacb12ebabdb79fd682f1e14bc822/giloxij.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/woput.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1623981955.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/xenifukinuxikajukefena.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210726060101189.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084066e9a83b---dalatodepozurogidasisam.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7ceb1cb7cc6678e2acc99a92114d1357/41200567659.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160891d733e001---51869457300.pdfIn PDF document text
    • http://asokmontridental.com/userfiles/file/gaweliz.pdfIn PDF document text
    • http://czdashan.cn/uploadfile/file/2021072007341573499.pdfIn PDF document text
    • http://dermalab.pl/userfiles/file/92515042600.pdfIn PDF document text
    • http://rotang.net/userfiles/file/31181497769.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/datodi.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/71893836844.pdfIn PDF document text
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/3a98c78d2ca1a800b9fed76043541d71/xarewora.pdfIn PDF document text
    • http://wonderful-foods.net/userfiles/file/4386391415.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccadd7ea8a---49426446585.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/zemovowevuwakasixoxiwulub.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d0d2ddc128cbd1ebbce0fe0cdd06850a.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/76205375882.pdfIn PDF document text
    • https://www.ventisilva.com.br/ckfinder/userfiles/files/63771842845.pdfIn PDF document text
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/82385774805.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=litiasis+renal+pdf+tratamientoPDF 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_off0000c688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC688 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000de9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE9A 17596 bytes
SHA-256: fe6d61e010258049bb8ca5ca9c6e8f76935b8fef583710ea9533d61dce35f93e
font_02_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 10616 bytes
SHA-256: a8e20f5e35ac2494a1fb249855af4a77998f2007692f37fc47bf7d32b18b8dce