Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f11999865c9d1e6…

MALICIOUS

PDF

76.3 KB Created: 2021-09-18 11:22:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 02197994fe320dc01fac855d61806b98 SHA-1: 2a6c66f5bb13d698d0362ad995b83dbadae307d8 SHA-256: 5f11999865c9d1e6d1be69962a351fa6e7c008846995187c659ddef8b64000e7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload directories, indicating a link farm or SEO spamming tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://happyland-nsk.net/ckfinder/userfiles/files/kalofibinukudasewitexuton.pdf In PDF document text
    • https://motodubai.com/uploaded_images/files/wosepowex.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/25463407473.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/figixunujefixuvep.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/54042737792.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/35473823580.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/um577jnhpgt99ceih3s11urfl4/rujekatepo.pdfIn PDF document text
    • http://polaryachtmanufactory.com/res/wysiwyg/file/31889412413.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/luneru.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/251387bb0ac522fc40696be7b996b6aa/megavudipurunida.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/xalabexodovoxo.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/88865233096.pdfIn PDF document text
    • https://mangalargalux.com.br/ckfinder/userfiles/files/37671151407.pdfIn PDF document text
    • https://valve-toho.com/userfiles/file/nedegexajat.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/pepowa.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109041532398256.pdfIn PDF document text
    • https://davaocarrental.com/images/file/labiwimexufenofixuvi.pdfIn PDF document text
    • http://kukubara.com/zdjecia/file/xafatosuwanok.pdfIn PDF document text
    • https://afra24.com/basefile/afra24/files/wajuxusebinosoxidakukazeg.pdfIn PDF document text
    • https://globalcareerclub.com/FCKeditor/userfiles/file/nabosezuluf.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210905220734.pdfIn PDF document text
    • http://gndpta.eu/news_objects/files/kesef.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16135120a65aba---93384944142.pdfIn PDF document text
    • https://showdetango.com/bafa/userfiles/file/woniba.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/161458568ac492---mesofodusenaxoziwakozop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=free+internet+tv+apkPDF 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_off0000c860.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC860 10048 bytes
SHA-256: 31ab3b582ccc78f979ef63f950354ead17c73d850889ce23fa86b636ff87ed9b
font_01_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 17396 bytes
SHA-256: 73d78b27853a6df9a5d7d043cf05cb90edf4338f730754543c5de60d8dd7c461
font_02_sfnt_off00010b4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B4D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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