Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ac60d59fbd87802…

MALICIOUS

PDF

83.7 KB Created: 2021-08-24 12:47:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bef864a713f93c09e95dd7eada615328 SHA-1: 270ecefdc5a1b8d301b68835f51af773181f3ad8 SHA-256: 6ac60d59fbd87802f249c41bdeb48d9adb5317bcee508b2fab17c69bbdb9b0e8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The PDF's structure and the presence of multiple external URIs indicate an attempt to lead users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ffe65f345ed---3873104632.pdf In PDF document text
    • http://aftckwt.com/uploads/file/wiluturega.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/timajuvegizinup.pdfIn PDF document text
    • https://nffcd.org/userfiles/files/wafigigegi.pdfIn PDF document text
    • https://innovaciones-plasticas.com/imagenes_cont/sitio/documentos/80260890213.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/gopawerosi.pdfIn PDF document text
    • http://eltonltd.ru/sites/default/files/uploads/kapare.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/3af2afdcab4bc92a00bc40e5834c0de9/kalopiwodif.pdfIn PDF document text
    • http://ingfrimale.com/userfiles/files/mudeleraxatijamovofom.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/74758129341.pdfIn PDF document text
    • http://stigstudiotecnico.it/userfiles/files/vagumepetolazevisisid.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/bonofidurofe.pdfIn PDF document text
    • http://woodlander.sk/grafika/file/40316650633.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607892f576942---80220753754.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1c946d256---rudalozuvowe.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/70045561321.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/lp14bq6eofsofi54qoeejd0n00/wamel.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca29f7bb42---90803761859.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/fa16a5c1358cd433b9bca570e3814132/fewenisusepi.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/bs5gbfagcc9gsde1ft79v1u7m3/77912262600.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/i0bsmuf4q4ilsnm5ne58afgk20/83587846400.pdfIn PDF document text
    • http://vuadiemtayninh.com/hinhanh_fckeditor/file/vexusokub.pdfIn PDF document text
    • http://namjapizza.com/app/webroot/files/wudezapevatixidugalok.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=confrontation+in+aged+carePDF 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_off0000e5df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5DF 10468 bytes
SHA-256: 73ec1cca4710ab527e0e7c836f9f30132197a14e4cce6349e2539775761de1d2
font_01_sfnt_off0000fda2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 16660 bytes
SHA-256: aaf6a78a3647b9d04a1004c3cdb909429b82ebb0a6a888b0f112a50833539052