Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c96c869ac8a5e08…

MALICIOUS

PDF

90.2 KB Created: 2021-08-02 12:04:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: e6f885dbe9a0306c81c7509da20947c2 SHA-1: 3b9e135617a87ef522d14b7920cbe7d0a956b307 SHA-256: 7c96c869ac8a5e08234e1a855d42e66f2d26a657ae46aa06fa0031b8c53a64c4
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm suggest an attempt to direct users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://chinalabware.ru/d/files/19686868910.pdf In PDF document text
    • http://velkoobchod-man.eu/ckfinder/userfiles/files/71287851935.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/rawefem.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/potomeweponegiluk.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/rotojetexipu.pdfIn PDF document text
    • http://webinaris.net/ckfinder/userfiles/publics/files/93015670130.pdfIn PDF document text
    • https://triosms.com/userfiles/file/puwefimuv.pdfIn PDF document text
    • http://cecev.com/stockages/files/18763356377.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dfa62ca7445---rorefalimudodobul.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/2vsjlci4q49l5gjj4kqmt91dhl/91922841654.pdfIn PDF document text
    • https://orangcar.com/app/webroot/upload/files/voleteberuwazerepus.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45776aeae2---19761130915.pdfIn PDF document text
    • http://zkojicin.cz/userfiles/file/7607479998.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/vigero.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/lurofatipepokovat.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/mmtc5ceca5n4cc8i230ok7lm02/lebobuxebijokugubegosiwud.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f785ac735d783e0ee4d18d20920a38e2/86396100147.pdfIn PDF document text
    • https://pelletier-tp.fr/ckfinder/userfiles/files/25710791188.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/d9c670638958b8684ee3d3de7ca61359/rixitidulasagavozewowi.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/melopixadugidi.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091cf26b7df5---95925848386.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=descargar+certificado+digital+para+google+chromePDF 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_off0000fc2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2D 17376 bytes
SHA-256: 01cf95d621347a631f06694e4385914589679c1328d3599334074de74e097877
font_01_sfnt_off000129c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129C5 10964 bytes
SHA-256: 75f7515e234abea6f69e499d8f90bb5dd7f71d52a7fa6ad18674d6617fe84fe3
font_02_sfnt_off00014306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1