Malicious PDF — malware analysis report

Static analysis result for SHA-256 668d0c16986e5540…

MALICIOUS

PDF

80.6 KB Created: 2021-09-15 10:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 9c63e1937945e739562a1800f2492409 SHA-1: f9540b49e90fe6e145542f2214514ee41ba6fa44 SHA-256: 668d0c16986e55404352251c8beff665c359caf34b4fdb297c5f2a3f24e4cc96
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to redirect users to malicious sites. The PDF's structure and embedded links indicate a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/42127386291.pdf In PDF document text
    • https://www.pelicanfinancialnetwork.com/ckfinder/userfiles/files/59083981009.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb1064ef3c---38667816420.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/guzez.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/a4hsolc6tb71ibcjonjn4voj5q/guzoropam.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613544f4ea57a---gogarinemisivaxifiwokunij.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/gasanumewojetapomaxujusu.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/lusekoboxikodevoxo.pdfIn PDF document text
    • http://hodori247.com/uploads/files/pifadef.pdfIn PDF document text
    • https://eijo.in/ckfinder/userfiles/files/17028580688.pdfIn PDF document text
    • http://zatuchlina.cz/upload/file/topezavakubimezaxanil.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210912034837_129408817.pdfIn PDF document text
    • http://huiking.cn/uploads/file/090446439789.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/78616320413.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/tuvazuwamobaxozajoj.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/30f9ff31e9bf5449873254658cc04db6/vamexomusodabefif.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/7d3d7a3c21894cc2932255cb3c57e116/wujesidipabalitaruvevepa.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/zojugagulab.pdfIn PDF document text
    • http://svazekobciorlice.cz/userfiles/file/85746509370.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/80353721769.pdfIn PDF document text
    • http://retco.ge/ckfinder/userfiles/files/zimomazutegeboniluzaxonal.pdfIn PDF document text
    • http://hangtatmj.com/userfiles/moxepaxalegel.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/3571112919.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/kiperabekoda.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=emoji+update+whatsapp+androidPDF 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_off0000d679.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD679 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE90 10912 bytes
SHA-256: 5f810e4f31e116dd12ff1b447e7b9c85097e7f8e7edb5bd01aaecf9438b92ce2
font_02_sfnt_off0001079d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079D 17488 bytes
SHA-256: 1ef6a50a7685fd3b97dde6ef84613971c47d7fab87c8de52eeb199341f36f917

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