Malicious PDF — malware analysis report

Static analysis result for SHA-256 dce09b967c3fbb64…

MALICIOUS

PDF

88.1 KB Created: 2021-06-29 05:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 4f3ddb9658cf8889bfea941462fea9f6 SHA-1: aa03315c2f38300d9e791893f7148baae3b6e85f SHA-256: dce09b967c3fbb646ef7894cac136d200cee4751f8571befeb26b68a5443f3b5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The sample was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous links to potentially compromised WordPress sites and other disposable hosting, indicating a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics suggest this PDF is part of a phishing campaign or a distribution vector for further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/16e134ef8ffcdb5d6239c78420e2e366/93166012039.pdf In PDF document text
    • http://beachfirebrands.com/userfiles/file/89148648504.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/50159189417.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///rofijemozarapisazomuda.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/29098962219.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/ff1673aeb3c5b350774f0243e5a49f25/14243251946.pdfIn PDF document text
    • https://mkting.com.co/wp-content/plugins/super-forms/uploads/php/files/e966ebf8d524e444ebe7bd8009b52bc5/jozovinuwodadizaluzezukag.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/rifef.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/10978843663.pdfIn PDF document text
    • http://zartmobilia.com/userfiles/file/20210525210818.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c18decd0f---kulitasaginevixubuga.pdfIn PDF document text
    • https://chaplains-camps.org/upload_picture/file/vijimomolokodowilurodif.pdfIn PDF document text
    • http://albatrossmrn.com/konadnew/userfiles/file/zabiwisalirotupezaso.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/siparatitepuluwefug.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607d318f773c8---53118637484.pdfIn PDF document text
    • http://mextro.de/upload/files/76275280882.pdfIn PDF document text
    • http://precedent.by/_newsite/images_from_html_editor/file/puremuxobakanukafotopa.pdfIn PDF document text
    • https://ancoraeducacion.com/images/daxanuzanez.pdfIn PDF document text
    • http://slippersymposium.com/clients/875641/File/numesudogisegawuwog.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/8945300baa4cac8a24af58192ba2e252/17570243026.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/11781669513.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/8741234845.pdfIn PDF document text
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d472349c3b---ravowibakipobolibaresuve.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/16d0cddd0e019123839c4fcf693892ca/5046886118.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aacfd4b3987---wogukeninemebisume.pdfIn PDF document text
    • http://zatacorp.com/upload/files/pumatiritamemisezaw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=clear+and+present+danger+tom+clancyPDF 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_off0000f3bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD1 17512 bytes
SHA-256: 8ba8a829d5dc07da9de49c9a7630a8f9603fa5b895d4cdde9f7142bbe8e9ca13
font_02_sfnt_off00013989.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13989 10908 bytes
SHA-256: d31e86de85e4f4e22a4dc7b56f671a5b6890ea86ce02581c6923a1805036932c

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