Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc816254ca2721a6…

MALICIOUS

PDF

191.6 KB Created: 2021-09-04 13:30:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: e12d928ba1e9cf9acbfa6bb77b668ac9 SHA-1: 9225223db8360d79f514d64c5c74882022d436ce SHA-256: fc816254ca2721a6627e43245f38ce1567e0800bbbf66309d914e8e351a8fb16
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://duquenne-moteurs.fr/webroot/upload/files/35268608073.pdf In PDF document text
    • https://art-lamps-rali.eu/files/file/4470254334.pdfIn PDF document text
    • https://rosycaffe.com/file/51013736779.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/sesis.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce4b5e8f5f---tunasarebilezamavud.pdfIn PDF document text
    • https://fotinepmuveszeti.hu/kovagoors/uploads/files/93647916143.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/96ac726703e1b60ea8cbd1cc962f50a1/tidatewokaradagiwuwu.pdfIn PDF document text
    • http://minutemen-jrotc.com/clients/84940/File/28004211596.pdfIn PDF document text
    • https://editora-arara-azul.com.br/site/admin/ckfinder/userfiles/files/ginabibofufopikanitafimo.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/tumijufulemikefokexisanu.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/sebuboxev.pdfIn PDF document text
    • https://www.newhorizonscrisiscenter.org/ckfinder/userfiles/files/79882069072.pdfIn PDF document text
    • https://tylbm.com/Upload/ckeditor/files/27474990657.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/af0f91509f7c7b070eaeff220a7e80d3/81831785308.pdfIn PDF document text
    • https://www.stamfordtaxis.com/wp-content/plugins/super-forms/uploads/php/files/ddedmrqj1tuqcq68ps18kqq8h3/76856877826.pdfIn PDF document text
    • http://herve-coiffure.ci/files/favupegizuzelirawowono.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/bofedutatoxanakenebitulu.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5f22d3436---gasora.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a43fc07e12a---87848803716.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f5c74400f---51734035131.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e03ee1bcb57---ritawonigexadedof.pdfIn PDF document text
    • http://drsuthichai.com/userfiles/files/15599933822.pdfIn PDF document text
    • http://metabolit-plus.ru/files/file/34161060772.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/zulamuzu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=siemens+optipoint+500+economy+phone+manualPDF 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_off00028c57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28C57 18936 bytes
SHA-256: a1619131feb1e037a7d9fbb077090bf187ae323fd6034108e3cd9bd43685a8ef
font_01_sfnt_off0002bdfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2BDFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0002d614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D614 11084 bytes
SHA-256: 688f48906ea2fface464048f653c9207b269b3dcd0cbe06a99feb49ab5eb77d2