Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5eb18a99064471e…

MALICIOUS

PDF

92.0 KB Created: 2021-08-01 15:02:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 26a01179a9dd174c7a2ec90cabee8102 SHA-1: cd8a15dd12d01fb602057a254192ef86fe9e0d76 SHA-256: d5eb18a99064471e3dbc28271fed8b9df96b2e61e296bfad9d2bf0fbd38396b5
156 Risk Score

Malware Insights

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

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or redirecting users to malicious content. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://american-security-inc.com/assets/ckfinder/userfiles/files/dojuvevutisapibulixezi.pdf In PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/qbcua12ih9lvn6l8l3epi3bcj3/13975025626.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5e207476f6---somewosozulorebimifeneto.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075daae53112---2436390747.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/2638800675.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/42421904601.pdfIn PDF document text
    • http://yule-sign.com/upload/editor/file/20210606074703.pdfIn PDF document text
    • http://sevoir.hu/uploads/file/joxeji.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/aa5c11d04a92e49d114b55914da94cb0/28181123403.pdfIn PDF document text
    • https://kenhquangcao.vn/uploads/files/21794195097.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a7e7128cf4---95351660471.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/5fed4e2f2ca9eb595777b32297425082/30990472188.pdfIn PDF document text
    • http://ahs1978hounds.com/clients/0/09/09313dc2b2b2138818c22350edca9cf7/File/14775657147.pdfIn PDF document text
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160ade671d6b45---76823195743.pdfIn PDF document text
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/cabe0895176b6e2735b69c2580f62b13/xuvidede.pdfIn PDF document text
    • http://cloverdiamond.com/file/jarusurujizimebiravif.pdfIn PDF document text
    • http://xn--80aab8aioy.xn--p1ai/userfiles/file/karovipapimanifopuxitupox.pdfIn PDF document text
    • http://pronobile.de/catalog/file/33009322517.pdfIn PDF document text
    • http://e-hematologica.com/users//file/tujefa.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5a0219e23---vulugojaxomexikobel.pdfIn PDF document text
    • https://forex-robo.org/wp-content/plugins/super-forms/uploads/php/files/cdfc577cc6ef05fe478f3b0ddf1d4ebe/gibodelakawikitujazi.pdfIn PDF document text
    • https://www.djluk.co.uk/wp-content/plugins/super-forms/uploads/php/files/sdhe2p4nb8vi66pjkv41oogith/lijozumamivaw.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/60709636820.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=ejemplos+de+adjetivos+calificativos+posesivosPDF 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_off000102d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D8 10756 bytes
SHA-256: 7606e5f06f5ab97fac5bfb84573e15e3994423decfa14fddc6f0a2236d9cdaa5
font_01_sfnt_off00011b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B9A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000133ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133AC 17516 bytes
SHA-256: 1a7e42b18df0af905916eba753e4179c9fdf539636e5fc49245e0fc54ac5726d

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