Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8c8ec9b5cfee85…

MALICIOUS

PDF

72.1 KB Created: 2021-09-01 07:12:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: a47d72a6d0e69cad5638f6dc1b42cffe SHA-1: 8c65b5c7efb99e56f7a27d764ad78e817083421b SHA-256: 9c8c8ec9b5cfee85ddd0ae4340173aebb25da92f1394ee1c6f63ee6a5548631d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9988

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 https://asiajitu.com/contents//files/9721752795.pdf In PDF document text
    • https://gulfsupremesa.com/ckfinder/userfiles/files/dukuze.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/51479944333.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/v6sis4qk4t2b99nuqncgeqs41g/54886505038.pdfIn PDF document text
    • http://xn--oy2b9bv81anouola.com/upload/file/202107300426597928.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609724564d6a7---30659588841.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/160ba09f56ec16---76450547663.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/5ards1ltce8g424pn901cgotf7/69392506604.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/07/27/55816845323.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16125f659232b9---18869415928.pdfIn PDF document text
    • https://binarbaidfabrication.com/public_html/userfiles/file/mevobipopu.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fdeac307d45---43188998746.pdfIn PDF document text
    • https://seroinstitute.com/wp-content/plugins/super-forms/uploads/php/files/9cc39e8eaf0fa18165e5d73f9cd6d190/90956012738.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/8372702516.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/grcd2r9f5sa0o30sqastq86ru6/3499361424.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c990c0a946b---kimomev.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/38202960649.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/fatasi.pdfIn PDF document text
    • http://atletika-pardubice.cz/files/file/59673875244.pdfIn PDF document text
    • https://curvy.tw/upload/files/79464850454.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/36586313181.pdfIn PDF document text
    • https://samudra99.com/contents//files/73443677829.pdfIn PDF document text
    • http://xn--hy1bt45apoap01a.net/jangheung/userfiles/file/60729946045.pdfIn PDF document text
    • https://panificiopasticceriabattaglia.it/file/41775842407.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=madame+butterfly+pinkertonPDF 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_off0000ba31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA31 10928 bytes
SHA-256: b1f501f8d9200f4af424ee557de9abf69f38ac40c03936c4be61989b7142ce04
font_01_sfnt_off0000d338.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD338 15628 bytes
SHA-256: ceb4fcb658af58d907b02df699c10ae11e14e9778252056d00616f80284c7e9e
font_02_sfnt_off0000fabd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFABD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1