Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9195e4acca4dbb8…

MALICIOUS

PDF

86.4 KB Created: 2021-06-28 13:50:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 14baee43d550f1d758f0c9b7249f152f SHA-1: ba1d4bf7c0bd585545934336a66319c2787a5708 SHA-256: e9195e4acca4dbb848849d5220d363e800a66b0095a9e0a5115dbecb27fa0e7f
96 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised CMS upload storage locations, suggesting an attempt to distribute malicious files. The ML classifier strongly indicated maliciousness, and the presence of numerous URLs on potentially disposable hosting reinforces this assessment. No scripts were extracted, but the structure indicates a lure for further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160954871ac3ad---98476891937.pdf
    • http://shqinze.net/admin/upimg/file///56460450496.pdf
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba212a77124---65544214723.pdf
    • http://s8radziejowice-paszkow.pl/userfiles/file/kuzebemufusar.pdf
    • http://ecologie-energie.com/userfiles/file/pepatologufaruliso.pdf
    • http://szao-spb.ru/images/news/file/wuxezoromilutapobu.pdf
    • http://tubietelbar.hu/uploadfile/fimekifivedotuporam.pdf
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/81f536dc63ff6334810dd2b4b8e808cf/25466489446.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0281bf4a4---nodeke.pdf
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160826406d2871---24655444720.pdf
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d4c33baf0---gujuninaketaveke.pdf
    • http://bienbao.net/uploads/files/5055417285.pdf
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/16075167737ae5---wupobanevoxumareb.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b135254b867---84528179237.pdf
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609ecebc21860---vimonibapozolu.pdf
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160af7e1c7ba7d---sisizumaro.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c237bdb9830---75157494294.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160984e69b0675---87334438339.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160abf55a7ce1b---68845190339.pdf
    • http://nexxosrealty.com/userfiles/files/pamezufefusijoxajubiko.pdf
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0089bb5bea---76838828229.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d506a5623d---48531936398.pdf
    • https://agmatbaa.com/upload/files/popapibo.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/f9cf4f2956f87778447dd0bedfdb830d/tevomadexofo.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=country+code+517
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eece.bin
98aa47ae630aeae3aab6d8f88286901108f711881ba68f026d9f148c215c414a
pdf-font-stream PDF embedded font (sfnt) at offset 0xEECE 10376 bytes
font_01_sfnt_off00010695.bin
e5002c67c4675321142a2b7c5688a8300a6a7e52cc387007e10f1b45cce63722
pdf-font-stream PDF embedded font (sfnt) at offset 0x10695 17568 bytes
font_02_sfnt_off00013474.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13474 16792 bytes