Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9d3073d1ed1b641…

MALICIOUS

PDF

67.9 KB Created: 2021-08-29 00:23:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 8a43aaf74f1dcd647773a294bc44fdd0 SHA-1: f8b64dbf70fdb6c0aec1a92b922815633eadfcf9 SHA-256: f9d3073d1ed1b641c310c6bc0ac11a5fbe64bd2ce6babb20d02c5432bd13c847
154 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It functions as a link farm, with numerous URLs pointing to compromised WordPress upload storage. The primary URL identified is http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762d002106a---zesefejenideneju.pdf, which is hosted on a compromised site. This suggests the PDF is intended to lure users to these sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.7133

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 http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160762d002106a---zesefejenideneju.pdf In PDF document text
    • https://mountainbrookbuilders.com/home/mountain/public_html/ckfinder/userfiles/files/mixokalumakedurebutomidef.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/87443416735.pdfIn PDF document text
    • https://dermatologie-chamonix.com/userfiles/file/gagolevapujizujopizireb.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/siraginasoxo.pdfIn PDF document text
    • http://brezov-gaj.si/uporabnik/file/juvotorepirubugukifumo.pdfIn PDF document text
    • https://orkhaconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ulqu8u8aht7vjpmlbic9jrmqc6/91769583990.pdfIn PDF document text
    • https://gencerenerji.com/resimler/files/folabuz.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/rugawigoxilozuzezelo.pdfIn PDF document text
    • http://www.mustwalge.ee/data/content/files/xurulezisub.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aa3679ab31c---mefekevifiruvig.pdfIn PDF document text
    • http://matsonconstruction.net/userfiles/file/gegeziga.pdfIn PDF document text
    • https://digireg.cz/upload/munavaxakejudofizewij.pdfIn PDF document text
    • http://bertrandetgastineaudesigners.fr/userfiles/file/mubutemelulera.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/53515581379.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/fojebizokasifa.pdfIn PDF document text
    • https://cald-lighting.com/wp-content/plugins/super-forms/uploads/php/files/6f9b4617b4b3cab9f6244293083775f5/kegelo.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/xabivunamogubeweb.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/160797695e5895---suwakaxugivujokera.pdfIn PDF document text
    • http://udaybharat.in/ckfinder/userfiles/files/98891944993.pdfIn PDF document text
    • https://alnahamgroup.com/userfiles/file/47426342952.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d83613534a5---14710969355.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/83190953308.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/16082d08ea0c2b---mojatuwazitasekutixomo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=onwards+and+upwards+from+herePDF link annotation
    • 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_off0000b87f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB87F 15928 bytes
SHA-256: 737688a35ce1c23bca6392819b08079aaeeef67b083cf7ea709a7c7cf96fd011
font_01_sfnt_off0000e0c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0C6 10740 bytes
SHA-256: d5054241fed4d1e86310f6670504bd0847ce461374ef4ef1da23482e29660def
font_02_sfnt_off0000f95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF95D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1