Malicious PDF — malware analysis report

Static analysis result for SHA-256 420aed5dda3b703f…

MALICIOUS

PDF

96.9 KB Created: 2021-08-07 14:51:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 35d9a743c2de92b6f81c580d0459e546 SHA-1: 2b65d03a9e01d627d10de4345d548ad5ef77c393 SHA-256: 420aed5dda3b703f62a7501343ef3f23d46a123d22254f34555a5f2e362b35a6
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 and disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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://ayurvedicclinic.org/userfiles/file/ledatatuwoxom.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1572324d85f94d3cee7406f624703fda/zojalipi.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/jegapemedime.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/160894cd4c878f---jupikexotifatulibuki.pdfIn PDF document text
    • http://bogelaipigeon.com/upload/file/sitebuwopozasusiteven.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160975c969cb26---dopuvipeba.pdfIn PDF document text
    • https://www.asahinafunnels.com/wp-content/plugins/super-forms/uploads/php/files/rj1d7gouo40i5amoslpr0h94gr/59868865291.pdfIn PDF document text
    • https://xlux.vn/wp-content/plugins/super-forms/uploads/php/files/1inrlbemjnhhcd1ij1vd30imct/6772694203.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/e92747369550815579516bdc23f2ebe6/5448744396.pdfIn PDF document text
    • https://incoyun.com/calisma2/files/uploads/bogibavusir.pdfIn PDF document text
    • http://ji-tien.com/userfiles/file/2412652369.pdfIn PDF document text
    • https://gifarlcm.com/upfiles/editor/files/71529128121.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/0639f6e2b86fcf96156f742f61298814/tazutaretodopidajuxezuwim.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d150b5d909---5098870053.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/9d8bbcdad94a1cafd515ade78c96501e/vupakolusaluxat.pdfIn PDF document text
    • https://akproauto.com/nbloom/fckuploads/file/44795412916.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/da5e0469b509b4341912434c709e2026/dikajidoluworitifabarap.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dd316a09f---zoteworegogej.pdfIn PDF document text
    • https://kaptenhoki.info/contents//files/90182338562.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/9a94a3d1d0806e07b8a9cfa590366b76/viratapuneke.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a04bdda11e9---88962908397.pdfIn PDF document text
    • http://coyada.com/up_images/up_images/liboxizipofe.pdfIn PDF document text
    • https://istanbularicilikfestivali.com/upload/ckfinder/files/49917494963.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021062609594473499.pdfIn PDF document text
    • https://abugfreemind.com/userfiles/file/96064205353.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/7d9e00864384080b6b0a18e381222f14/89226267872.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/83326511256.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=descargar+among+us+pc+mega+ultima+versionPDF 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_off000113e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113E0 18588 bytes
SHA-256: 20114d7531911987bb983f899f4f369af09c70df5188060a5872b0e4983a3bec
font_01_sfnt_off0001432d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1432D 10884 bytes
SHA-256: 24f87becb7255e0ac16137f49ac8c5d14c76f00df1698582ed312cded6e9cfc7
font_02_sfnt_off00015c67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1