Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d309b60c9041745…

MALICIOUS

PDF

80.7 KB Created: 2021-08-18 06:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f9e9655e8678ed412835bea83da05294 SHA-1: 1bb3492424616d68661887753a19e03a99eeb1cc SHA-256: 2d309b60c9041745144e65ce02416bf5db1aafcbf600d57ad3adf831f24d6117
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bf9e8ab7e41---65843803221.pdf In PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/12aa763a8ea5a5415f2b4e3c34c508e5/tunifojawur.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/76043103854.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/zeponadidibubizara.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/gagiwifepupusok.pdfIn PDF document text
    • http://gernano.eu/gfx/userfiles/files/69094185644.pdfIn PDF document text
    • https://selispin.com/calisma2/files/uploads/58030187269.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6121835e7---balirosi.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/39e1cbaad4716c4194c4ae5c1b8dea74/46875980078.pdfIn PDF document text
    • http://2rent.gr/userfiles/file/xibon.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607e91a527ebc---14791976266.pdfIn PDF document text
    • https://namratalakhotia.com/userfiles/files/49088915547.pdfIn PDF document text
    • http://berallebags.com/UploadFiles/FCKeditor/20210627205612.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/mowojedevajamufomaw.pdfIn PDF document text
    • http://livestreaming.group/wp-content/plugins/super-forms/uploads/php/files/m9gq4a316qn07jke7jqi29nlfgsqeq38/64626121820.pdfIn PDF document text
    • https://wumusk.com/asset/uploads/files/23000908670.pdfIn PDF document text
    • http://modnyi-buket.ru/uploads/files/vutuvegupaxololalenefel.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/jatogomuzirik.pdfIn PDF document text
    • http://baloneacessorios.com/_upload/file///dumediworigeropiw.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862b9a950f8---dobegewovarova.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160ab481a68596---65954560964.pdfIn PDF document text
    • http://dblbtech.com/userfiles/file/ludev.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a1e7c911cde---pisuvususi.pdfIn PDF document text
    • http://chiangmaicharmingtravel.com/ckfinder/userfiles/files/29695251032.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac96b2d4d39---nufolumipexakok.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/35961175452.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/febozotewiw.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/24b1e1fe179f621d20e0647be5a0cbb2/2952213661.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=free+5x8+index+card+template+microsoft+wordPDF 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_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1ED 15860 bytes
SHA-256: d39eb8b173c2963387c5b3d37697c954c7828e3a08e56189b1a129b2fcb83cc1
font_02_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 11288 bytes
SHA-256: 5fefaa61cdebfc637cf426ce08fc1ffc0ce4e437e639e7c9cea514162bb9bbbf