Malicious PDF — malware analysis report

Static analysis result for SHA-256 793bf5e4fd6ab3d1…

MALICIOUS

PDF

85.7 KB Created: 2021-09-20 02:35:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 2a05546bf8884d8726c55d3777ca9e15 SHA-1: 386ef91a44b9f43429b752573b3a4f4101fbf011 SHA-256: 793bf5e4fd6ab3d1e1f95144676ba164f584d6beb22a4287385f3c385057cfa6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents that leverage embedded JavaScript for redirection or exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://tehla.eu/userfiles/file/runezorexugudixob.pdf In PDF document text
    • http://dejede.com/userfiles/file/12462330540.pdfIn PDF document text
    • https://maymac.info/userfiles/file/3954689164.pdfIn PDF document text
    • https://homeuu.biz/upload/ckeditor/pages/files/senovifazufokopof.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///romifeken.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/47637078617.pdfIn PDF document text
    • https://www.babetravelling.com/ckfinder/userfiles2/files/77434108417.pdfIn PDF document text
    • https://sunpower.lv/ckfinder/userfiles/files/99332948582.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130fd7c1782a---7099812735.pdfIn PDF document text
    • https://rintrans.com/files/97354143659.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/15773498887.pdfIn PDF document text
    • http://neonatal-surgery.ru/userfiles/files/zibulapegorekobivapeva.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090704521738.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/cksetrtu48an412s367ddu9fbo/wukik.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143752226486---83917916178.pdfIn PDF document text
    • https://ph2020.org/FCKeditor/file/tedor.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/tinomodo.pdfIn PDF document text
    • http://jn-zhsc.com/upload/78467314839.pdfIn PDF document text
    • http://tostonet.cl/ckfinder/userfiles/files/badelunisaki.pdfIn PDF document text
    • http://solamsys.com/userData/board/file/lozudodalesozemaze.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/49096939161.pdfIn PDF document text
    • https://nepalfinepashmina.com/userfiles/file/385532581.pdfIn PDF document text
    • http://ozdesignhouse.com/app/webroot/uploads/files/73471065157.pdfIn PDF document text
    • http://firsttimehomebuyerstudy.com/images/file/59130411387.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/190e0ae299eabc93c028606845c48186/jujuwejiremo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=pomelo+file+explorer+apkPDF 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_off0000def3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF3 10344 bytes
SHA-256: a6e762fa5c472f80f2092a0c6e2817521408aceeabe6c707d69c595f5357397c
font_01_sfnt_off0000f642.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF642 22496 bytes
SHA-256: e7d3d8a34b14bccbee938707e43a697832999b27ed1e4e024f89a2e9d1cb19a8
font_02_sfnt_off000130bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.