Malicious PDF — malware analysis report

Static analysis result for SHA-256 17562277b24a1346…

MALICIOUS

PDF

69.4 KB Created: 2021-09-26 13:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: cfdcfa4ead7791a6dbb5d5341d10bfd6 SHA-1: 019077d964a39f727bc2261d905e16b0e4b12846 SHA-256: 17562277b24a1346502eec11f1a59e8168a8352d5ce29a7965e5cabdc974b0bc
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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
  • 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 http://margheritango.it/userfiles/file/petok.pdf In PDF document text
    • https://krygina40.ru/UserFiles/File/nofaxogajilerakujune.pdfIn PDF document text
    • https://www.db-ynox.fr/ckfinder/userfiles/files/gakibimurex.pdfIn PDF document text
    • https://thuaphatlaihoanghuy.com/uploads/files/sifunimanirorebukepov.pdfIn PDF document text
    • https://hzautomatisering.nl/userfiles/file/98072936848.pdfIn PDF document text
    • https://successstudio.net/userfiles/file/1490197154.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/e6b1e2d79b3cf138ea7e5c0dde36d2cd/30917879564.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/wezaburezurugat.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/zebejabuvodaperotamato.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3aeece5a1---nibozani.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614fd1d949053---wegivajupenanebaxaxikirol.pdfIn PDF document text
    • http://sun-marche.com/app/webroot/js/ckfinder/userfiles/files/31731075224.pdfIn PDF document text
    • https://art4you.sk/editor_uploads/system/files/90801585209.pdfIn PDF document text
    • http://saothienemb.com/uploads/images/files/danapokenezoz.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614c2e074a9e8---xubebotatob.pdfIn PDF document text
    • http://es-manzokudou.com/yamituki-n/uploads/files/90197345553.pdfIn PDF document text
    • https://nitm.ac.in/nitmeghalaya/ckfinder/userfiles/files/wewijuveku.pdfIn PDF document text
    • https://kingwrapcarspa.com/upload/files/guwuxujotozi.pdfIn PDF document text
    • http://lianbang123.com/uploads/files/202109090559493108.pdfIn PDF document text
    • http://aquaclub.hu/userfiles/file/fetesij.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/1680165599.pdfIn PDF document text
    • http://instalace-charvat.cz/userfiles/file/jevadazu.pdfIn PDF document text
    • http://hoangminhphatkorea.com/webroot/img/files/tarawoliril.pdfIn PDF document text
    • https://www.nissan-utilitaires-melun.fr/ckfinder/userfiles/files/89145410829.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=pvz+2+1+coin+hackPDF 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_off0000af9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9A 10176 bytes
SHA-256: e04a6acc38e6217fb8ac087e0accf3d325e20689a4e115ed334d857b29ab9792
font_01_sfnt_off0000c66b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC66B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000de7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7D 16404 bytes
SHA-256: ee3d2252cf787a95fc5d4850df79676e20f7ca49ff2756993ce80e422495fccf