Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d584ddf0f1142ea…

MALICIOUS

PDF

74.3 KB Created: 2021-10-05 17:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 78dd936a1564fa00f590c28288f1c553 SHA-1: ea3af7eaec5b1bf3ab6c4606e8acd06cd15160d4 SHA-256: 7d584ddf0f1142eaa49931da83262b5f8422f202ab9954bc35aea6445132f046
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and the ML classifier assigned a high probability of maliciousness. Heuristics indicate the document functions as a link farm, directing users to other PDF files hosted on compromised CMS upload storage and disposable domains. The presence of multiple unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://sportingclubalbinia.eu/userfiles/files/91790135677.pdf In PDF document text
    • https://estatecambodia.com/htdocs/cljr/data/files/biniwe.pdfIn PDF document text
    • http://talcmanagement.com/uploaded_files/userfiles/files/83010972550.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/89358062251.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/xolujod.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/lepepiwixa.pdfIn PDF document text
    • http://tai-yang.tw/taiyang/upload/file/vilid.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/wefevopip.pdfIn PDF document text
    • http://jn-zhsc.com/upload/60403294729.pdfIn PDF document text
    • http://araratmebel.ru/img/file/93691035200.pdfIn PDF document text
    • http://ibb-online.ru/f/file/sugasijenupisaki.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/lonajiz.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613de9f7a6f87---kixumut.pdfIn PDF document text
    • https://dobre-akce.cz/media/files/file/69065132816.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/voxituvuxenelete.pdfIn PDF document text
    • https://118highschool.am/wp-content/plugins/super-forms/uploads/php/files/9ef626c613ba274a1117065ad4865454/gavunaremukokigepe.pdfIn PDF document text
    • https://tort-art.ru/userfiles/file/jokud.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131fd9daa811---77253036827.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95d9a2fb7---vixezinizufo.pdfIn PDF document text
    • http://thessalonikiflights.com/files/files/mosonur.pdfIn PDF document text
    • http://locthanhwindow.com/img_duhoc/files/99995521362.pdfIn PDF document text
    • http://appli-veolia.net/ckfinder/userfiles/files/zojuruvevonomibisopitur.pdfIn PDF document text
    • https://veriniams.lt/userfiles/file/temegudegirijiledomi.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/83913420681.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=dethatching+lawn+before+and+afterPDF 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_off0000bf1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD72D 17104 bytes
SHA-256: ed9ec21f8c6f3d42e46e264b01c0f890b8e816af6e303079f925cede46458907
font_02_sfnt_off000102ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102EC 10816 bytes
SHA-256: 0dda4bcfa8baa1c44a164a85197aec2932bd599ff1849cf915d956d4bb8a0755