Malicious PDF — malware analysis report

Static analysis result for SHA-256 414db409f3f01c24…

MALICIOUS

PDF

75.2 KB Created: 2021-09-16 17:09:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a68ac5b062668274c036d7c394d13f61 SHA-1: 05babb17036b9c4163c16d961343780656a036e3 SHA-256: 414db409f3f01c243e7d60b2237fa6f71815b010ea116795814ce0b86e5f2de4
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document contains a link farm pointing to numerous distinct hosts, many of which appear to be compromised CMS uploads or disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. The presence of multiple external URIs and a link farm structure strongly indicates a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/28264946299.pdf In PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/13639612081.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nezupeduzizejoxed.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/ktq9fu5l0gsrn8od7lvj16hf18/16441567137.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/23538181332.pdfIn PDF document text
    • http://www.farmaciapenil.es/userfiles/files/lodezejamovabut.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/2vd93lqvl8g6k3p7635il51enj/53323574039.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613137f3bdbf4---27161831815.pdfIn PDF document text
    • http://iamsoldierfit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f6a8a877fc---32333298164.pdfIn PDF document text
    • http://le383.com/uploads/files/bagubaduxavibaselejeb.pdfIn PDF document text
    • https://makanbanyak.net/contents/files/66678669325.pdfIn PDF document text
    • http://hmed.vn/upload/files/84459514584.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///vosep.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/mezagisozudakuni.pdfIn PDF document text
    • http://soles2walk.cz/data/file/fujisofiluwerubupar.pdfIn PDF document text
    • http://pepinieres-soupe.com/userfiles/file/24347874612.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/83406342005.pdfIn PDF document text
    • http://mhfmjournal.com/data/22/2/55/64/2544879/user/2788947/htdocs/userfiles/file/sunonozutade.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/giratam.pdfIn PDF document text
    • https://phoenixknights.co.uk/wp-content/plugins/super-forms/uploads/php/files/d0c72b76c0620d5b9285466932b74128/fugunugaxamavigefewe.pdfIn PDF document text
    • http://xn--80aer5aza.xn----htbdepbihnfb8cyg.xn--p1ai/ckfinder/userfiles/files/69864048583.pdfIn PDF document text
    • https://bangvetthuong.com/luutru/files/38009998257.pdfIn PDF document text
    • https://kimcert.org/E/file/66171257096.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/zixip.pdfIn PDF document text
    • http://professionalcatererspaul.pageindia.com/resume/cms_files/files/77200423239.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614203f57279c---31566482136.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=cube+world+wiki+pet+foodPDF 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_off0000c36b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC36B 17080 bytes
SHA-256: 988603de87ddec6594946d41eb466482ef5f05fcf58182873c8e1c765307f0a1
font_01_sfnt_off0000ef70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF70 10508 bytes
SHA-256: 8a19ad47eb1b50d493618efcb08ac8048d62c219ebf091edb69f1fa73d552bfc
font_02_sfnt_off00010749.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10749 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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