Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6103dbc8d7d16c8…

MALICIOUS

PDF

59.4 KB Created: 2021-09-26 17:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29bbd880fb2b46eb047bd951c73683f2 SHA-1: ffcc36edfb7381d6ac867fc8130f2f3cb0591dfb SHA-256: b6103dbc8d7d16c8f47cf54da9876c94861540d6b95e08c48fac2875d020033f
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a large number of external URIs, many pointing to compromised or disposable hosting, suggesting it functions as a phishing lure or a downloader for further malicious content. The presence of embedded JavaScript indicates potential for client-side exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6789

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=intentintegrator+in+android PDF link annotation
    • http://dgjinhak.kr/DATA/upload/files/202109170626149013.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109111029325180.pdfIn PDF document text
    • http://agavietnam.com/img/files/45787965895.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139efc1eb8b4---38333223239.pdfIn PDF document text
    • https://trvstore.com/userfiles/file/maxajorimevawimazuvozujo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613be0aa3135a---37485175095.pdfIn PDF document text
    • http://chiangmai-clean.com/user_img/files/73879239479.pdfIn PDF document text
    • https://dpengineerindia.com/admin/userfiles/file/54023969105.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/26105057528.pdfIn PDF document text
    • http://hanauhrova.cz/files/xopinidaluw.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/16148513abe33b---51217104487.pdfIn PDF document text
    • http://itcck.org/upload/editor/file/dudixexudigidafesoga.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7c783d94a---wawefazanekasigesujudiri.pdfIn PDF document text
    • http://www.themixchange.com/userfiles/files/jexaviwipesidubudopigop.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613827a9abb76---ropapajojiteserafomute.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/govepegosufurodibavoj.pdfIn PDF document text
    • http://eros-arena.name/eros/userfiles/file/76213231800.pdfIn PDF document text
    • http://disonde.com/filespath/files/20210918160149.pdfIn PDF document text
    • https://mahae.hu/files/files/91342163676.pdfIn PDF document text
    • http://barbusci.it/maisUserFile/file/93663982378.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/xezuboxavugoxifeba.pdfIn PDF document text
    • https://xn--90ah6akb9e.xn--p1ai/f/file/66449075087.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/sogivozituvabevuse.pdfIn PDF document text
    • http://galettedesrois.hu/userfiles/file/jodelawif.pdfIn PDF document text
    • https://www.funes.gob.ar/ckfinder/userfiles/files/bevubesiro.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/61489045581.pdfIn PDF document text
    • http://mmbc.cz/_data/user_files/file/jopepumow.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/19318995714.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_off0000b2ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CE 10160 bytes
SHA-256: cd8a610e0b68480856ee4a1f624a1d97883619d73f1057eb5204b9f091c765cc
font_01_sfnt_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 15172 bytes
SHA-256: 266d407b72354d202fd57dcedf323be184257d268d4024f556f77c96c21efcfe