Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ad118bd2ea6b344…

MALICIOUS

PDF

83.5 KB Created: 2021-09-14 04:11:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 9d4e4233753221cd0cd64a7080cd36d9 SHA-1: a7eade4e74848c968e34d79dcd34bbd79a39faec SHA-256: 5ad118bd2ea6b3440e6060cf46d8862d3b094e65cdc0c4ee8ffe2533f5fc82f6
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF used as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

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://coretry.ru/uplcv?utm_term=rabbids+appisodes+download PDF link annotation
    • https://sunnyrosesschool.com/userfiles/file/11232410229.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/66072045900.pdfIn PDF document text
    • https://novitas.ro/files/lorodano.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/petazejozelalo.pdfIn PDF document text
    • http://pi-consulting.ch/download/33329139279.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/60828066686.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/38340277628.pdfIn PDF document text
    • http://phayaotechno.com/UserFiles/File/10230764133.pdfIn PDF document text
    • https://www.sesc.com.ua/wp-content/plugins/super-forms/uploads/php/files/1fvjgd58pihvivd1ndiiuhbrn4/22134337878.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2ff115dd2---xenezefiwurilusafefopuvug.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/bugutibejikavapiwulazut.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/tuzema.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/1758761205.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/gujobital.pdfIn PDF document text
    • https://abogadosaccidentealicante.centralcms.cloud/galeria/files/vuxaset.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613d1fca48550---88227603970.pdfIn PDF document text
    • https://laurallo.com/ckfinder/userfiles/files/bewijimupe.pdfIn PDF document text
    • http://winso.tw/userfiles/file/bofatezubuxujenisit.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/29528345102.pdfIn PDF document text
    • http://keletunderground.hu/images/uploaded_pics/file/97299444285.pdfIn PDF document text
    • https://millinerandassoc.com/files/file/75964697279.pdfIn PDF document text
    • http://bikipvuikhoedep.com/app/webroot/files/editor_upload/files/79901746294.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/4654938684.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea31212c6e---50354142367.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c734.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC734 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF45 16188 bytes
SHA-256: 50e4e5c301317ddaa6bc97553efbe95aabc716c5d1cd02b0160b1f1966d10f99
font_02_sfnt_off0000f50a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF50A 20460 bytes
SHA-256: cf7bcca1b00bac53e8092899a3d195f72670a2d5796add3368ad4d8207bb5d18
font_03_sfnt_off00012810.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12810 10460 bytes
SHA-256: 53b9e35bcf2b882dcb4d65786811159f5a3d1b242ae25facdbcac8446afa0819