Malicious PDF — malware analysis report

Static analysis result for SHA-256 c236fe7416d8bc09…

MALICIOUS

PDF

82.4 KB Created: 2021-07-17 04:43:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: eea1d5397c1723f9a0e557488f3167d8 SHA-1: 5b4f1ea8dd81ac28ddc287109fa36db77870d2b4 SHA-256: c236fe7416d8bc094db9dea0677850ddc926aa4f820617c049ecc79261acce01
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains a link farm pointing to numerous compromised websites, suggesting an attempt to host malicious content or phishing pages. The presence of a 'download button' lure further supports a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://gencerenerji.com/resimler/files/gomomulifisajadetik.pdf In PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d65a25daf7---41554555527.pdfIn PDF document text
    • http://wych123.com/upload/files/64339661168.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b991e4aadb---2845572016.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/fabeadf8af3e4cd1e6124f2b4b92177a/zeduriwedosed.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16084faf0687ca---tizubixolaromeluf.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/nilapu.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/16086c537489e7---widune.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/p301jj64qhgghc8suu92tc92p0/xowenebuguxizafo.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b00d878349---gegivananovixuzo.pdfIn PDF document text
    • https://www.temsilcisitesi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c54e27ac503---faguponapewirudapijanewi.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4ec19cc64---nurilogimola.pdfIn PDF document text
    • http://savitapiti.org/ckfinder/userfiles/files/xozemovonasedenozi.pdfIn PDF document text
    • https://cvsc.co/userfiles/file/libilijatusegu.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/29c66671d1f4c79d3f3d22bebb8030f4/36107198142.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081bcc1f1135---86254856676.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/17429729865.pdfIn PDF document text
    • http://beiks.info/public/file/motoxevapi.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/zatizuzeponuke.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/todadage.pdfIn PDF document text
    • http://daugiavanthienphuoc.com/media/ftp/file/fovimojixaluxuli.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/15ad0dee0034cb7d9d2d305421379f83/56638412736.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=11th+chemistry+volume+2+guidePDF 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_off0000de11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE11 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF623 17200 bytes
SHA-256: 004422adecb66c962dbf22f54cccd82de52bed42898f758d25999703c2c55e20
font_02_sfnt_off00012316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 10904 bytes
SHA-256: f1921a8b2877887521c8881e64af0a62b23a2b39140cbe2427035317530b350d

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