Malicious PDF — malware analysis report

Static analysis result for SHA-256 b36fb0e9c9ae5d35…

MALICIOUS

PDF

106.7 KB Created: 2021-09-01 16:43:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a9dac167bb16d5a6d0a5b4aa41aa3dc5 SHA-1: 0dcd4f455c89ec25231ea124cb721308630d121a SHA-256: b36fb0e9c9ae5d35f818a97a4e61e5622bd590ff85249b689cdb2afd2996323a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and contains multiple heuristics indicating it is a link farm hosted on compromised websites. The embedded URLs, such as http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16118e512a2b0c---fijojamaxibonexalixebodem.pdf, likely lead to phishing sites or further malware downloads. No scripts were extracted, but the overall structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4276

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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://pablohernandes.com/wp-content/plugins/super-forms/uploads/php/files/49975c6abbf5ea5af80bdb680ad80371/rubebovitegarolo.pdf In PDF document text
    • http://turatabor.hu/media/80469651980.pdfIn PDF document text
    • https://menu2uplus.com/images/file/13043387609.pdfIn PDF document text
    • https://www.olympusnorge.no/wp-content/plugins/super-forms/uploads/php/files/nlrjbl0lgsrtk09f13roj3hqbq/visefakukekifa.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c61eb31076a---luralixudutogex.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/7c3ecb91bbf6761ba9b57b071c4b2629/79651546333.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b80c3adc67a---jokixiredejotomesaka.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e227e5c12f5---rituvakegasupaduzesok.pdfIn PDF document text
    • http://aimecostruzioni.it/userfiles/files/vexeniwuvanekug.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607128708217a---53563439379.pdfIn PDF document text
    • https://lusagroup.mobi/images/website/user/files/jisesesusopoludoropuwomo.pdfIn PDF document text
    • https://www.andrecampbell.ca/wp-content/plugins/super-forms/uploads/php/files/2ad9fc9282a906ecdef9c28fc78a5bb0/pokamop.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/wekopetesusajax.pdfIn PDF document text
    • http://zeroseistudio.eu/userfiles/files/bikofivonapi.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/10129590178.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a52084090da---bugekugaxifuzazuwoviva.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/73645972489.pdfIn PDF document text
    • https://sygimportaciones.com/wp-content/plugins/super-forms/uploads/php/files/fhqn2cd776i0tsvjoa9pc1upjj/25897758793.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/wubuvilefuteduxaxes.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16118e512a2b0c---fijojamaxibonexalixebodem.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/id2fja3f3ethk3frh1ma4a2eth/dumabap.pdfIn PDF document text
    • https://pakianco.ir/data/image/uploads/news/files/xatoravifunem.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/48344432676.pdfIn PDF document text
    • http://mesterek.net/tmp/gotugoxelonipaxog.pdfIn PDF document text
    • http://gaongonmaiphuong.vn/webroot/img/files/subugi.pdfIn PDF document text
    • http://rialta.ie/userfiles/files/widikotapegat.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/ragujanexunezitewazoz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=the+battle+of+the+five+armies+tamil+dubbed+movie+downloadPDF 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_off00014265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14265 19224 bytes
SHA-256: 6023c70d55b7636d184cf1759ca10b65b1aadfefd85b5b5b4a10a61b794cd1c3
font_01_sfnt_off000174b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x174B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00018cc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18CC7 10976 bytes
SHA-256: 85237e13d844da713b492d27f6a0a86aa4264f30916b743c0737459ee70997de

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