Malicious PDF — malware analysis report

Static analysis result for SHA-256 43cb957a32c505bb…

MALICIOUS

PDF

80.3 KB Created: 2021-09-01 04:04:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3487ed4c8b03eed7a53c8db092f533f4 SHA-1: 271c2c0bf6a4db5029dcf8abfe7a4fdc23c85ff8 SHA-256: 43cb957a32c505bb3febf9dd74f00c9c68f6826624c65848886bd4c018223c8a
154 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm or phishing lure. The document body is heavily obfuscated and unreadable, but the heuristics indicate a malicious intent to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6563

Heuristics 5

  • 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
  • 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 https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/312a2350f148c0395b04eb14844f4af1/51263794644.pdf In PDF document text
    • http://marklaliberte.com/fckupload/file/paralimarabamowuvej.pdfIn PDF document text
    • http://autoset66.ru/admin/ckfinder/userfiles/files/39339239418.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/12783439926.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1f50b43544---dubojufafalagejaluserewos.pdfIn PDF document text
    • http://big-blue-bus.com/pics/fotos/1/file/dibiganexufogipomej.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4d8006ce48---vudozawamexafisovobavo.pdfIn PDF document text
    • http://burchiellati.com/file_fck/file/28349265238.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607836f28d584---wamewakelokajitabeguku.pdfIn PDF document text
    • http://nenorm.com/files/files/bazupokakatelevosutufu.pdfIn PDF document text
    • http://rld-carbon.ru/file/gixulot.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd73a7291d---vodopozuwufibopaz.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075ac86b5631---nituku.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081a9f73f47f---sefuxonovexoko.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160d365c6c16d3---87609298893.pdfIn PDF document text
    • https://chiataiec.com/userfiles/Proj_Name//files/semaboza.pdfIn PDF document text
    • https://daulte.ch/ckfinder/userfiles/files/47448979748.pdfIn PDF document text
    • https://wrd13.com/force/file/budepogikej.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094617c9f170---7798802709.pdfIn PDF document text
    • https://taiwancy.com/app/webroot/userfiles/files/funizaditemu.pdfIn PDF document text
    • http://medica-brno.com/files/tijorapujizoba.pdfIn PDF document text
    • https://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/2dc684a918890492d46adc9923196a55/83356500671.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf993a3fa3---kekavirezagawunuletidide.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/tavazefugugularesozizisas.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16072738c9e419---giwivirifesexifokibimu.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/fuzesagexixakonak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=10+common+laboratory+apparatus+and+their+usesPDF link annotation
    • 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_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 19236 bytes
SHA-256: 09c4946c925b7f13d472167c22f7e193170302e7b0c3daec65856bc388124c23
font_01_sfnt_off00011260.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11260 11208 bytes
SHA-256: f932095d480de8463c61898e37329887a104ea1928329f4113ba49dc2feaf8b8
font_02_sfnt_off00012c34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1