Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfe415b0c0b4d8d…

MALICIOUS

PDF

71.3 KB Created: 2021-09-05 09:55:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d5a531cd60fc5062200fec3d558a8977 SHA-1: 56e338061d7e96a702244fcb268bd22d3c52ee31 SHA-256: 4bfe415b0c0b4d8dab7d83d8b4869db0e8ba1bf6f15690aafdce16f75e87471e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting an attempt to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics indicates a tactic of using link farms for SEO poisoning or to host malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8257

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://archism.ru/uplcv?utm_term=aeroplane+parts+and+functions+pdf PDF link annotation
    • http://yuanyoujie.vip/userfiles/file/jivapo.pdfIn PDF document text
    • http://rebeccaosborne.com/uploads/56250265797.pdfIn PDF document text
    • https://termofriz.rs/files/29338778926.pdfIn PDF document text
    • https://primax.fr/wp-content/plugins/super-forms/uploads/php/files/g4kp04kijoviltfcuvlvseg254/52060439525.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16075d493a1272---ziguva.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110892796c45---20677474390.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee3752857b---9645795017.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160705161f2d4b---gikowewadopanutejagapi.pdfIn PDF document text
    • http://degeninhotel.ru/admin/ckfinder/userfiles/files/pubipimu.pdfIn PDF document text
    • https://masihpt2.com/contents//files/77275591858.pdfIn PDF document text
    • http://solarhomepage.ch/fckeditor/editor/images/file/ziwakejezulizir.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/8064184709ca2ed38154996bab9a20bc/10896227650.pdfIn PDF document text
    • http://rld-carbon.ru/file/32188863458.pdfIn PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/d96d55d859d5c01e01bf0b8f81efcf3b/43497866452.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba36828625a---fajegexenipadeduj.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/bitodukekipor.pdfIn PDF document text
    • https://verandapattaya.com/userfiles/files/polabofimuwefifir.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/736abab76c8e90298d5764182949993e/85365749018.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607242e0909de---pugibowajofinom.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d6aab4efd---fudokitime.pdfIn PDF document text
    • https://lionkingbali.com/uploads/file/leloxume.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de35912f40e---68905257511.pdfIn PDF document text
    • https://mma-montessori.com/admin/ckfinder/userfiles/files/roxonigavafifan.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD41F 10692 bytes
SHA-256: afc987dda38778c85587116cf8da5338d1ae2d4cfe1d9fff003ece7b724b90d0
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 17724 bytes
SHA-256: b4701db94e87819af1ccf185295adbd6a41fbb170442c31b652296b1a22172bd