Malicious PDF — malware analysis report

Static analysis result for SHA-256 09bc55be077b5f56…

MALICIOUS

PDF

88.4 KB Created: 2021-08-27 11:28:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 809ebbceba898411d095f7488e79b72e SHA-1: 1cd665ccccfa5dc357ba18693e3e4d83bb3c9d15 SHA-256: 09bc55be077b5f562407ef6787201bc67072ba4a17fd1725fc17d5435a6a8d9b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9945

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seedomoretravel.com/files/files/37915946270.pdf In PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/59bd2322e3562fe18144c1c6d60d860e/37181591353.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/i4b9e8iq9dq2u64m2583hlgdk0/nimapivipakodaresib.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/17777046144.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ec9c5d240---keritokexigoxowisu.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/64492385180.pdfIn PDF document text
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cc134ad7da---88603705055.pdfIn PDF document text
    • http://steps4cancer.org/clients/a/a7/a78c374070a178914b502abaf3db82b8/File/1651123164.pdfIn PDF document text
    • https://giraffeng.net/infodaily/gen-ckfinder/userfiles/files/10664913786.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160a22778282bc---zosile.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a286d8e6b93---92751621319.pdfIn PDF document text
    • https://argumentua.com/i/file/nuleropifexinamoripi.pdfIn PDF document text
    • http://www.moyekolodin.com/files/saruxutavak.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f56aa58deb---pezamimekaxomutedi.pdfIn PDF document text
    • http://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/bovizadafifapomaw.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160705a7c8b430---vomaxuniniwapir.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/vuzoxaten.pdfIn PDF document text
    • https://fminterativa.net/cms/plugins/ckfinder/userfiles/files/kejikoguzi.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/99460130680.pdfIn PDF document text
    • http://aliguoriarchitetto.eu/userfiles/files/902326190.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607898eb92540---tuvijebovanusijomanisim.pdfIn PDF document text
    • http://355353.ru/userfiles/file/9461898026.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/puketuzoranabuvedi.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/kuwojosiredajarewavuko.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/13855294810.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/kdc1eddo2pmmjce1nvjpt2ldub/gobowi.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/65561766693.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-8-14/20210814015917839875.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=physical+therapy+for+clubfootPDF 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_off0000f62b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF62B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3D 17112 bytes
SHA-256: 78568b3ac77e658dca268c07369859a098429549ce257547ee575cdddc8d3d3c
font_02_sfnt_off00013a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A6C 10828 bytes
SHA-256: e974cacab5a220f6305ed8665c3815c976a358e7ffa7ca5641375538e8d173f8