Malicious PDF — malware analysis report

Static analysis result for SHA-256 065f1838455ceecb…

MALICIOUS

PDF

90.9 KB Created: 2021-09-23 10:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: fb7712a4a2bfb3dcf6d2b37aff8309d3 SHA-1: e641a262d4f0f778ce075c101313fbcd012fdab3 SHA-256: 065f1838455ceecbd9a6102f78d0a49d39794e19da8a96a4d31beeed18e334ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, suggesting a link farm or distribution mechanism. The presence of external URI heuristics and the ML_NYX_PDF_MALICIOUS firing strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/21040533627.pdf In PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/fojirazu.pdfIn PDF document text
    • http://hejia-ele.net/upload/nibusej.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/92271247076.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/26184154633.pdfIn PDF document text
    • http://ifap.it/images/file/foxowejetixu.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c1acc1c3d6---lezizavixigerexituna.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/jovalatawunazaxodu.pdfIn PDF document text
    • http://olivetheater.com/userData/board/file/bewivug.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219181237597419.pdfIn PDF document text
    • http://prakseologia.eu/userfiles/file/dilamek.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/13472832461.pdfIn PDF document text
    • https://etest.vn/app/webroot/uploads/files/22990548073.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614579e1b0faa---90839338696.pdfIn PDF document text
    • https://durgabas.coop.np/ckfinder/userfiles/files/mogebusobekapes.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614163c1b8c5d---ganiluxazijenozowimasula.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161396368580d2---musizowevobabesuxa.pdfIn PDF document text
    • http://rencontres-icare.org/userfiles/file/32147813571.pdfIn PDF document text
    • http://rakkhunnursinghome.com/user_img/files/29878949621.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/5utsobdcli34r3l1khc58p2uql/31278233624.pdfIn PDF document text
    • https://vnnc.vn/img-hdmedia/files/negigosapiju.pdfIn PDF document text
    • http://edins.net/userData/ebizro_board/file/41560968767.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=best+iptv+apk+for+firestick+2020PDF 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_off0000fce5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE5 18316 bytes
SHA-256: 253454433d93f41b805646b6f8e9fa385f23197648bda46ed79a1bb708dfc269
font_01_sfnt_off00012ce4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CE4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144FB 10776 bytes
SHA-256: dcf17246d530d50f6c2867c68984f09191ca86a6a30f024e8b530e7ae7b3bb81

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