Malicious PDF — malware analysis report

Static analysis result for SHA-256 76759cde23387cab…

MALICIOUS

PDF

80.8 KB Created: 2021-07-27 22:43:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 449a8e063628f03c63a5809fec217ba8 SHA-1: 760bdf7e4a71a7408a636444bf9359dc38078c60 SHA-256: 76759cde23387cab1ce939c4f7a9a2445c59543bcf1a89e0a5f55b2afb1aaa2f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a PDF-based phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/1609e41f21777f---panomep.pdf In PDF document text
    • http://nuraski.pl/wsg/userfiles/labakeburidugi.pdfIn PDF document text
    • https://thewaves.net/wp-content/plugins/super-forms/uploads/php/files/7qi000d53btgini4an2va8f9ni/75042221257.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/ruxedufezozutidiruxave.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7b9be8bf---58870712883.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/zadafusuxojapexepivijasin.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/22409379033.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/zokulijukubanufojiv.pdfIn PDF document text
    • http://vieclamquantri.net/upload/files/32594664410.pdfIn PDF document text
    • http://fitviewer.info/files/file/gisemulamafunuxugila.pdfIn PDF document text
    • https://1877painters.com/FCKeditor/file/sipikuvizoduniresifo.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/16096fb550af15---77028055839.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210616023113.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/6cc065b6accec8f89852b23533cad0b6/vapunuwik.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16080857aabc61---42463880441.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/6361497030.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/ed8da7e4c46525072418c302c6116638/sepegew.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085c07d82c1a---kefabijazelulalomajezatus.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160b4be0f0aea5---47434653724.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/57473233e56a919b6fb3e9f8d5096c4b/vimegarajabumiximas.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/43947032204.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/b19a780d76e094192586f21d16c72802/57387536331.pdfIn PDF document text
    • http://sequoia59.com/clients/867919/File/18357114090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=holt+mcdougal+modern+chemistry+book+answersPDF 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_off0000d7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7B5 16440 bytes
SHA-256: cd606887ed754250dc32744df8490a8f604195ed9a90b70138b879ba49336c20
font_01_sfnt_off0001024a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024A 11340 bytes
SHA-256: f7f12a6a8b1e7d8a7af6067b53d2ba58f94c84c9c25aa5f1f927236f6eddf2da
font_02_sfnt_off00011c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C98 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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