Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ed033fc8f4cf649…

MALICIOUS

PDF

120.7 KB Created: 2021-09-21 00:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 821907362d55f48554c189a44e952ae4 SHA-1: 1611e9dc9bed430f6afe194b6fc187bafb635241 SHA-256: 3ed033fc8f4cf649f55138ccae275bddaad08f8fe54f8087c099fd3a5b3859fd
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various websites, many of which appear to be compromised or disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it functions as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8502

Heuristics 5

  • 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
  • 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://ketchas.ru/uplcv?utm_term=free+keyword+generator+software PDF link annotation
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/30378165130.pdfIn PDF document text
    • http://fapannimario.it/userfiles/files/76888113863.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/61833181955.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/fugepenevezevifuwovef.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/161479aca0b67f---78215893815.pdfIn PDF document text
    • https://marugame.hk/editor_upload/file/nozazufuzipufamineget.pdfIn PDF document text
    • http://karat-dobremiasto.pl/userfiles/file/38313585629.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161476c2e5b68f---dukivudetug.pdfIn PDF document text
    • https://www.seblocation.com/ckfinder/userfiles/files/71053977900.pdfIn PDF document text
    • http://thriftstorewebsites.net/flash/thriftstorewebsites.net/file/92806454718.pdfIn PDF document text
    • https://noventa.cz/media/files/file/rorinexenatafugu.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/24462019166.pdfIn PDF document text
    • http://www.heksan.com.pl/file/66827725109.pdfIn PDF document text
    • http://sheilahancock.net/blogfck/file/48604536942.pdfIn PDF document text
    • http://dzstock.com/Upfiles/file/45517164507.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/kadogajuta.pdfIn PDF document text
    • https://mgs-on-track.com/app/webroot/userfiles/file/volutoje.pdfIn PDF document text
    • http://lamardaegu.com/upfile/user/file/38002171656.pdfIn PDF document text
    • http://markone-tools.com/upload/files/kofaxu.pdfIn PDF document text
    • http://benthanhsgfarm.com/images/uploads/files/26274283389.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148fcb8b9ecb---82256136444.pdfIn PDF document text
    • http://thewellmanteam.com/userfiles/files/13549387304.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/bowabilorurefexare.pdfIn PDF document text
    • http://shop-exclusive.cz/userfiles/file/mederurozokipufi.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001b8e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B8E0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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