Malicious PDF — malware analysis report

Static analysis result for SHA-256 48d8afb0992d2ba3…

MALICIOUS

PDF

96.5 KB Created: 2021-07-29 20:09:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6d7cbb979425bd4bd970bd032f6ce4ba SHA-1: fd358c0819f9f3b6ac2374b4ef8dea7c32677b03 SHA-256: 48d8afb0992d2ba3250a502f0414d70c884f52e88e16230408fa92a824a1fb52
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content. ClamAV detection and ML classification confirm its malicious nature, likely as a phishing or redirection tool. No scripts were extracted, but the structure indicates a link farm intended to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://fusen-es.info/yamituki-n/uploads/files/83221502846.pdf In PDF document text
    • https://turismopontevedra.com/ckfinder/userfiles/files/xedusunevetizisiru.pdfIn PDF document text
    • http://wenxuezj.com/images/File/ritijixozi.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160a543345b586---rixevasawim.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210607_F41540F34EC676D6.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b74d31ecd10---sakagetanowitilotuvokaxe.pdfIn PDF document text
    • http://furmanreunion2021.com/clients/3/37/3732e4fa3878e851f9d164dff32a9cbb/File/80777998146.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e0060e8067---boferinanek.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/purovofesogagim.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/422747837.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/sowej.pdfIn PDF document text
    • http://congtydaihai.com/upload/files/guketavowirila.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/0qa8uav2f0gdp479221ng9m832/mukotetadowexiwitog.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/laobcrtgg3dt0sjfddktvb1ia2/79765335885.pdfIn PDF document text
    • https://nuregio.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c86ec00e9de---61080373097.pdfIn PDF document text
    • https://planet-pvc.com/upload/files/wukalavosoda.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec92c1a11f---97771237187.pdfIn PDF document text
    • http://autoscuolauniversale.it/userfiles/files/23445015436.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/95856873660.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d69e8bd923---42401863371.pdfIn PDF document text
    • https://luxurytravel-show.com/wp-content/plugins/super-forms/uploads/php/files/99c974c030df9a3988c6a283c0fec6f3/modekiwizogigad.pdfIn PDF document text
    • https://dongytueduc.com/wp-content/plugins/super-forms/uploads/php/files/cou9pouq905ov9ku94qs0jkps2/37104273650.pdfIn PDF document text
    • https://riondene.ch/img/uploads/file/gisekadojimupodovufewixun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=discuss+the+theme+of+feminism+in+second+class+citizenPDF 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_off00011022.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11022 10804 bytes
SHA-256: 133f53b6aa0507fc397e9ec9539ba8c6ddfe9419599bd7038eec35684644b712
font_01_sfnt_off000128e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128E6 18760 bytes
SHA-256: 0f80822c1bd9b7ccacbfe0c685b5fb84ec8c33463ad55b91dff8e4a142807d71
font_02_sfnt_off00015a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A73 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1