Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd3fc025fbd7a50…

MALICIOUS

PDF

87.2 KB Created: 2021-07-05 23:15:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5ea48d0abbb53ae157c7a78ef5d29e6c SHA-1: f1c81e71769d43d5c8a38e5f75593184fce28139 SHA-256: fdd3fc025fbd7a5012da8ffda7bd31ebd88d98fafe104e16136b4ed7418ea5d3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm or SEO abuse. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the nature of the links suggests the document is designed to redirect users to potentially harmful content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/a673e1465c52eaf300adb56944408a51/62139549702.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad24b796e---miduveworivesososut.pdf
    • http://www.southforconstruction.com/frontend/web/ckfinder/userfiles/files/86218161813.pdf
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160949e83eab45---88120975359.pdf
    • https://keluargamimpi2.com/contents//files/32226124216.pdf
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160717ae8c10c8---zubaxopabefavukef.pdf
    • http://rgn2u.com/userfiles/files/jegagene.pdf
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606efc98a8beb---bibefesanekagi.pdf
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/s5p8s33dubaphnm96cggj4jnja/kunolofumanitugafovaju.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160710e51109d9---palobebunidifuno.pdf
    • http://aptchasers.com/FCKeditor/userfiles/file/91513650392.pdf
    • https://micast.de/wp-content/plugins/super-forms/uploads/php/files/be996ppl70nj48qtjcai7b46l8/fasiposatetanigigef.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ab62279b68c---kufasodawijapizufawomo.pdf
    • https://alakharia.com/public_html/userfiles/file/dolexedopogovigi.pdf
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093041e2a662---40898447950.pdf
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764d1d309d7---16736374040.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/ebe899683cc64d4e52ca30740f6f6336/vilimanupifevoxanajodetox.pdf
    • http://kayapaliinsaat.net/file/23844944332.pdf
    • http://reszke.pl/fckeditor/editor/filemanager/connectors/php/file/kifibelidavet.pdf
    • http://christschoolblr.in/userfiles/file/90110609732.pdf
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606c670c06268---36564815806.pdf
    • http://autoscuolepintozzi.it/userfiles/files/83092891437.pdf
    • http://telegid.tv/userfiles/files/gejugizadosigekapa.pdf
    • http://reedxtrainternational.com/uploads/pages/file/14518967050.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=what+is+called+science
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2f5.bin
d6eabd0bc957e2389b2e5fdee23d4ca3f0341105d27fc74432dc8acd19377d13
pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F5 10240 bytes
font_01_sfnt_off000109ea.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x109EA 16792 bytes
font_02_sfnt_off000121fc.bin
460c1855a000487fc2bc44e25705f839a5fca3f04749428142541b83419ac4c4
pdf-font-stream PDF embedded font (sfnt) at offset 0x121FC 17052 bytes