Malicious PDF — malware analysis report

Static analysis result for SHA-256 249252f97734c34e…

MALICIOUS

PDF

77.8 KB Created: 2021-09-06 04:23:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-01
MD5: a3eeea6c80a00cda6fb06447362d482c SHA-1: 4ca992d1f9b87ce0550931b3106ca829147789b8 SHA-256: 249252f97734c34e5e60410f16cda5e28c1931ac6c0686fe400c754f42885936
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://mail-ex.net/userfiles/file/71969822428.pdf In PDF document text
    • http://skyparadisecoffin.com/images/media/files/65713806518.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/6645fbffa658d7f24aaae4552c4c601c/mozakidaxa.pdfIn PDF document text
    • http://franceplus.fr/userfiles/file/waripezifutiso.pdfIn PDF document text
    • http://autofulltravel.com/userfiles/files/37029550136.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/7ni7l3c39r9p9gho7q52a5o3as/galakurupimima.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/tuvoxiwogifawak.pdfIn PDF document text
    • http://julianowka.pl/ckfinder/userfiles/files/kukufe.pdfIn PDF document text
    • http://mgocsm.in/userfiles/file/jiwuz.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d65c45f161---fivorasegunimedapavaxawud.pdfIn PDF document text
    • http://3e-machinery.ru/app/webroot/filesfiles/zafamufaruditesupi.pdfIn PDF document text
    • http://mousike.it/img_ins/files/1992557755.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/ropejobe.pdfIn PDF document text
    • https://whatshoulditcostme.com/userfiles/file/78463080041.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/tinixokusuxiruvalanexin.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/f750b648fb29698f655a82015b1ad93a/35277965915.pdfIn PDF document text
    • http://global-poseg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611d9221c91b7---26687947420.pdfIn PDF document text
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/7327921582.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca0420fc11---64220701202.pdfIn PDF document text
    • https://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/9876cc16a1a0d286446f235065cb2bed/83821444927.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721d79d9e3e---majanometu.pdfIn PDF document text
    • https://churchofgodinjamaica.org/app/webroot/files/vakakomebudipudoduluv.pdfIn PDF document text
    • http://ecilingirler.com/resimler/files/rinabizokiminebinujagub.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/sudawegitu.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/28163188455.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=pleiades+neo+pdfPDF 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_off0000cb53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB53 18060 bytes
SHA-256: d73666f498b78139cf06987b68738dff3167b61d9ad894636a267ecaa9c2408f
font_01_sfnt_off0000f99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99E 10292 bytes
SHA-256: 01d93e482b92233086b694d6ff9a5aa48940c442d3733b31a1338f338bfb9d61
font_02_sfnt_off000110d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1