Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f9882d86e8d8d1…

MALICIOUS

PDF

67.0 KB Created: 2021-09-05 17:28:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a1a51b70df34d3d58197271141451650 SHA-1: ab23d9d2902ff87666338d3eb1795388ae2c7d41 SHA-256: 75f9882d86e8d8d168fd003cdd980821a419e98c093f4f68d4682b758a32103d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is used to host and distribute links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://garglob.ru/uplcv?utm_term=d%26d+curse+of+strahd+maps+pdf PDF link annotation
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c46d2af3953---43724508213.pdfIn PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/tatuletowabidetesex.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083256e19dde---79759839922.pdfIn PDF document text
    • http://hjtech.org/admin/upfile/file/32014818672.pdfIn PDF document text
    • http://elpijisystem.com/file/26443685401.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/18548673996.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/80620741258.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/e5c6355a23d3bae19599f7053fc19aa9/junijikura.pdfIn PDF document text
    • http://anonelectronics.com/admin/fckeditor/editor/filemanager/connectors/php/upload_jpg/file/202104282108117293.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/43815420488.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/lorejoz.pdfIn PDF document text
    • http://cloverdiamond.com/file/84250993544.pdfIn PDF document text
    • http://www.hangmandigital.com/files/file/lonoxugemogod.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/fexivadepomowudo.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/13rg7khdr1kstvbr77aoqpac6q/bigexiluz.pdfIn PDF document text
    • http://sartor.ru/upload/files/15912919998.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/tuniti.pdfIn PDF document text
    • https://sckprime.com/wp-content/plugins/super-forms/uploads/php/files/d0bc16934551588d625a8bfa11cddb1f/rulevoz.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/14164427554.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec880cd0e4---17557074312.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/gejunabawara.pdfIn PDF document text
    • https://movie2book.com/userfiles/file/1765910018.pdfIn PDF document text
    • http://biotop-zamosc.pl/userfiles/file/gumisaboxatonerax.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/6aba20d01992d5341cd7e6b4edc815ce/61198142542.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_off0000b0c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C4 9076 bytes
SHA-256: f695977626623e59fedb2fbedebd468d0acf89ff6f6ceafeb3cee4351ddee6c8
font_01_sfnt_off0000c369.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC369 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000db7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB7B 14376 bytes
SHA-256: 941bd6fa0c808784af8fbe08c3c1d1f06e4724424c53abba5e0450f1996a8017

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