Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4ccee3563d937b6…

MALICIOUS

PDF

82.2 KB Created: 2021-09-02 15:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4237a2af47fe5bfee544fd7fc9c9a235 SHA-1: d6f1e9bab4b57f2c48aad0c4a6f1e7ddb0472ac5 SHA-256: c4ccee3563d937b64c9d3dec3a737d46ac50880380467616311056e91bf4f97f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a link farm pointing to multiple other PDF files hosted on compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the presence of numerous external links to potentially malicious files is a significant indicator.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://dintainoodle.com/uploads/files/xizekilunofanipobuwi.pdf In PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/f9dtja6qd2p0439cmtrhmlolb3/bivifisa.pdfIn PDF document text
    • https://aptitudeclass.com/ckfinder/userfiles/files/82899214498.pdfIn PDF document text
    • https://projectmine.hu/ckfinder/userfiles/files/gawavonaw.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/6d62dccd99af5376a30b51cb6c3293ae/17102165943.pdfIn PDF document text
    • http://adveotec.com/img/file/50504430842.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/64340477300.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/2aec92c299afe72f5eb81742347307b2/ruzamuradulilutar.pdfIn PDF document text
    • http://timavoshipsupply.it/userfiles/file/37293335635.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/14304698327.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e50ab98ae---50255372019.pdfIn PDF document text
    • https://hasekei.jp/userfiles/file/xadusinogaxu.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/8162722490.pdfIn PDF document text
    • http://www.tiande-global.com/ckfinder/userfiles/files/netisirutevekumufanos.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16072b8c8adbc7---kelapuvaliwiro.pdfIn PDF document text
    • https://dubigroup.com/admin/fckeditor/editor/filemanager/connectors/upload/file/kolumemuxopuzirekume.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/16075fadc6f9eb---tenozolabewagibusu.pdfIn PDF document text
    • http://indianspringhomes.net/userfiles/files/72913163284.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609b147ed96b2---sutolepepasoditox.pdfIn PDF document text
    • http://lovesushiscv.com/uploads/files/51947466276.pdfIn PDF document text
    • http://aquatherm-graz.at/files/kopuguk.pdfIn PDF document text
    • http://rocb-ap.org/file_media/file_image/file/33889858099.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/ragoba.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/ratovururigo.pdfIn PDF document text
    • https://3drm.bg/uploads/pictures/files/denovavoxapajiwo.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160d74edac3fb0---88308944473.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=telling+time+half+hour+worksheets+1st+gradePDF 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_off0000dbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCB 11092 bytes
SHA-256: 3f3de00dcecddf184eae9a17d7eb66fbfb245f181c367a8ed219f11be9cfec02
font_01_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D73 17408 bytes
SHA-256: 1b400685a0573a83e9661efb36d131c5b9a8e9140fd92da6453c7a9136a181ea

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