Malicious PDF — malware analysis report

Static analysis result for SHA-256 c197e4e066173ffa…

MALICIOUS

PDF

81.8 KB Created: 2021-09-16 06:10:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 92a5d24880cbd80df9d750d4e997cbfa SHA-1: 813656b7a1b555eab000e012fc083d1fc17e59de SHA-256: c197e4e066173ffadc68ee3b847b70bc1aa11277c52bdee3d262784145adb83d
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The embedded URLs suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wonikqnc.com/upload/editor/file/1630501810.pdf In PDF document text
    • https://autoandtruckrepair.net/nbloom/fckuploads/file/37110406394.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/56724358431.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/k32aslqr8123rhs0o1e7id9pi9/boroxovape.pdfIn PDF document text
    • https://zenithoverseas.com/assets/userfiles/files/pawesawifivavojajonobewe.pdfIn PDF document text
    • http://luckyassessoria.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613313eaa8f82---kexivomitisawapeseki.pdfIn PDF document text
    • http://uzks.hr/upload/datoteke/40473119216.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132f727a0b3b---xurafipivuz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/03tic534un6ggo2qhm1j0ge9as/vomulitazizejejupuwezevu.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/9327693495.pdfIn PDF document text
    • http://88cpap.com/userfiles/files/35083125511.pdfIn PDF document text
    • https://mimpishio1bet.com/contents/files/tokutubemuxilevatifaveka.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/93e98849361bb071d54dbd9809ce6bc4/sewinim.pdfIn PDF document text
    • http://sibleyestateplanning.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/bagur.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/36915007216.pdfIn PDF document text
    • https://unosms.us/userfiles/file/63211014860.pdfIn PDF document text
    • http://studiolaviano.it/userfiles/files/nepaxefijufebuvi.pdfIn PDF document text
    • https://travelinnsuites.com/nbloom/fckuploads/file/83864657777.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/52dd0857ef79e9d22688e7fc8004eef6/47965027391.pdfIn PDF document text
    • https://cooperadora.grupocreartel.com/documentos/archivos/14132693256.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/begetudofozafesive.pdfIn PDF document text
    • http://mapect.com/upload/fckeditor/file/xinatedabinim.pdfIn PDF document text
    • http://vizugy.hu/uploads/files/zekutobosebewav.pdfIn PDF document text
    • http://lednotice.com/userData/board/file/xiforej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+send+gps+location+androidPDF 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_off0000dcb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB0 16892 bytes
SHA-256: 73a3e05b1b4ca90cc83725e950be23bea9a76e3593a459cada883c34ed18a36f
font_01_sfnt_off000108c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000120df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DF 10764 bytes
SHA-256: edef5285164f667efb99855b06bd581d5e8a133c08ceb93f7b34d4a7c03ca553