Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa1d2ea4d30b09a7…

MALICIOUS

PDF

92.3 KB Created: 2021-09-14 14:00:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9f414adb8db548b5d0f1c64723555e53 SHA-1: daf6aefe1c9662b8fbcbd54a06c05b49ae84cb7e SHA-256: fa1d2ea4d30b09a7cf12239a3a34a7700bd5ae70bc8c84e9b678664567e4c55f
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 https://archism.ru/uplcv?utm_term=mobdro+app+store PDF link annotation
    • http://mitchelllawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/riximofudi.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612efd169f470---babesesap.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/kusezudifuwipejevowaweni.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136abe98b2e9---ragiwarupukalikeweg.pdfIn PDF document text
    • https://kawanmto.com/contents/files/1816740640.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/edde51a7210b39b83a891721a7fa027e/potixusu.pdfIn PDF document text
    • http://smolninskayahotel.com/userfiles/file/miriwisinuredezo.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/20455311004.pdfIn PDF document text
    • http://boracayg.com/FileData/ckfinder/files/20210902_23A6CEAED46A1901.pdfIn PDF document text
    • https://hunde-katzen.at/soubory/4990004547.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/durutovufulil.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/24890344407.pdfIn PDF document text
    • https://red-adlay.com/upload/files/26547649720.pdfIn PDF document text
    • https://dodomacnosti.net/data/file/dunokabufe.pdfIn PDF document text
    • http://megalaserasia.com/upload///jadekapineguvisaziwatum.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/fisijibubun.pdfIn PDF document text
    • https://gbp.dropship-online.com/userfiles/files/95550934317.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/wizusarawubixenizipu.pdfIn PDF document text
    • http://poaglasses.com/uploads/files/202109020100449215.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/negovizufivosiw.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7df9ac3a8---16077837220.pdfIn PDF document text
    • https://www.vigo.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613da812ec216---gexepudetipaluwikaliradid.pdfIn PDF document text
    • http://prime42.ru/userfiles/files/23708078073.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/fuxirefuzivol.pdfIn PDF document text
    • 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_off00010564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10564 10276 bytes
SHA-256: 0c8dd77bb51efa9aee8a889a8f78a5b8629dcdc6d280f40f02a9a8a0c77a8158
font_01_sfnt_off00011c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013484.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13484 18004 bytes
SHA-256: 9807201796c85593ed619083c9b0bc56cbc41dfe409b8ba93d14f6cc26fd4d18

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