Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a91e0d59475fbf…

MALICIOUS

PDF

74.3 KB Created: 2021-06-01 16:31:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: d33a6879ce788950077285cda40f9013 SHA-1: 85353fc167a9ee2b744364a89d9b6562d178e8bd SHA-256: a1a91e0d59475fbff63177599aa183b4cb02aa5d31f40d6b849643d9d6a785b7
154 Risk Score

Malware Insights

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

The PDF file contains a large number of links pointing to various websites, many of which are hosted on disposable domains or appear to be compromised CMS uploads. This structure is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8825

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://ottotech.center/userfiles/file/17053867074.pdf In PDF document text
    • https://otdelkamos.ru/wp-content/plugins/super-forms/uploads/php/files/3bb8c90f625d68b84f5673e71bebe5d9/75285356020.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609665b3a83b9---dajagefaxakirati.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160962d55e3d04---fusupepoves.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/46110102485.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609da83a72640---jozisomovinevazaworosumow.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/96639686806.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/nesosorosake.pdfIn PDF document text
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files//busujixawutarakisenozexos.pdfIn PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/6nduq5f3nlokqpgc2obat51pb3/saxubamikupomudanirisuduw.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/bd339e598e9674c6f82aeb63decc459a/vedarotibikiv.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/160848bb9049da---vaweneleziwojanesokokure.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/160793f05793d3---jotokafafavikex.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/2a09ad0263a685c4ac553f5dcca9c307/gusedusix.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c970a84735---vomow.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/08a8dca9a2986fe583ba1adf36d02c29/22640449210.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607dfa67e0144---29957561943.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=amar+ujala+newspaper+today+in+hindiPDF link annotation
    • http://scripts.sil.org/OFLIn 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_off0000d4a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A9 5456 bytes
SHA-256: 8a447f9f4583f0eb4004b32c15f814e3339c56289354219698a695da39c073be
font_01_sfnt_off0000e71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71D 10780 bytes
SHA-256: f4775867140ae9184ab5963587bc5f9d6d2627fe53897bcbaf6b5c7b9d4d3dcc
font_02_sfnt_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 16164 bytes
SHA-256: 6e3fbd491d8b71441998836ddca0d0c102716a221ea14f8143929167ad9a79b3

Open this report in the interactive analyzer, or submit your own file for analysis.