Malicious PDF — malware analysis report

Static analysis result for SHA-256 5843eee161e5b1c4…

MALICIOUS

PDF

83.5 KB Created: 2021-09-07 09:01:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9b9a0394e0170707d83f7b4fab543e03 SHA-1: ee9452c67e0a751b5157cc0a85aab17ad26e7883 SHA-256: 5843eee161e5b1c4fe32211017f4a5a5c3b9d8f8b239f7d571adefe2fa352634
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 WordPress sites, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The file's structure and link distribution align with techniques used to distribute malicious content or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://paglialonga.it/userfiles/files/fikuvigodasejirum.pdf In PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/ladelururobip.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/v5njjk34kab9qpc1thcdm344ch/58957505146.pdfIn PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/23c88fb90afeaf694c856c3335e60ab2/49474863792.pdfIn PDF document text
    • http://www.haztartasigepszakuzlet.hu/pics/file/benisufinivepefimasota.pdfIn PDF document text
    • https://nangluongvada.com/uploads/files/21052328687.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160ec96f6daeb6---nujajuxofabusosusamelul.pdfIn PDF document text
    • https://mariellatriolo.it/public/file/74768372141.pdfIn PDF document text
    • http://hb1004.com/userData/board/file/75321408955.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/e85ac0d6160db9e61388f877a586d51d/ronozorobasosemanilofetis.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/vuwakapanekemaweguv.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/34756862203.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/f819c97892e0127b46d1d6287cadeeb4/sukagumokeg.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/76t78ke3o639bunct30a6tnll8/kodexusiw.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba003a60fee---31426821911.pdfIn PDF document text
    • http://marty-triple-m.ch/inhalt/files/97566475462.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/dc72973e91e7b839dc276dbd6fee0f5b/muganiwijodusewufagokemi.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbb8a653b8---dobozor.pdfIn PDF document text
    • http://lmleadmanagement.com/userfiles/files/53969756808.pdfIn PDF document text
    • http://kag.fr/userfiles/file/ganoguwore.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16075fe9b1eb77---47262244105.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/35123523350.pdfIn PDF document text
    • https://egf.tw/test2/images/file/3017701314.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160859e91f2cba---95433089631.pdfIn PDF document text
    • https://ceadersvalet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c288c7a190d---xuminuvasasuzunuxu.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202108250901288325.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=algebra+2+solving+rational+equations+pdfPDF 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_off0000dd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF590 11224 bytes
SHA-256: 1e8de007c81972dbe214c19ea7fca8f6b7c601a20a6b48a931bc6187a1951b8f
font_02_sfnt_off00010f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F52 18632 bytes
SHA-256: 53b80e75b49bc463f3197c510426710017239756a9a83d30fc5e7c0f1c83f3f7

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