Malicious PDF — malware analysis report

Static analysis result for SHA-256 3776690a4a77e37f…

MALICIOUS

PDF

88.9 KB Created: 2021-08-26 10:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0cb6b0b908e96dbb9458aa417f56c28c SHA-1: e179aac6f3e10169ddf4b1cec8e03cf2e4bf0150 SHA-256: 3776690a4a77e37f84b246dfa689e3854321d4b47d97d399e8b3b62fad5558d1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifier. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest it's designed to exploit users via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/78c018513f8525a64fc7df0825a9e262/31574989227.pdf In PDF document text
    • https://lodoshosting.com/calisma2/files/uploads/84287953486.pdfIn PDF document text
    • http://wearefamily1234.com/clients/3/31/31b46d3307e4516335aa88350909469c/File/60948738011.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/38e63fd26a40baf584a65e4e3af5801e/77465704173.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3a0a03706---kemerasemol.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe53436684---29658115296.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a794cfa07---vewupefanazuzebujodutiwuw.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160814f192218f---terup.pdfIn PDF document text
    • http://ghioroiu.ro/sites/default/files/file/85450007243.pdfIn PDF document text
    • http://maksimetall.ru/files/lodowejezudavasosivuxoz.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/towawopexepadi.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/1b93df2e43a5ad57fd21772c77668a3a/92945282908.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0504daf62a5df60b1775d467c60c23ab/81261936318.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/b36acc72fd0bc44406be5bbf9876f4fa/tiwiripusaxisawaxexab.pdfIn PDF document text
    • http://akssert.com/userfiles/files/loxasodopaj.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/xefimite.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160c13e8f95a60---tujavonorufafesaguminu.pdfIn PDF document text
    • https://2greenchicks.com/wp-content/plugins/super-forms/uploads/php/files/07551029f70ff9af0a4f343412cca9b1/xofuxofituv.pdfIn PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/17073448610.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609469f8d8ca7---82560699407.pdfIn PDF document text
    • https://threadworx.com/thread/admin/uploads/file/41020366731.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb23295287---21914992442.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/25baed782f3f2956cafb89974b0ca93e/bopivevapugumemitevituj.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5ebe13e96---97812007148.pdfIn PDF document text
    • http://allnatureint.com/userfiles/file/83061540735.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=it+is+what+it+is+meaningPDF 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_off0000fb85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB85 16276 bytes
SHA-256: 474930f8c479b20310d8c63ff2ccd626d83b4a8e1cb48f0e94163da4d6271ede
font_01_sfnt_off000125c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C6 10324 bytes
SHA-256: f07e0eef31b1c0bd416e666270b025b8f317f13e3091a4904f245329f12601f6
font_02_sfnt_off00013cf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13CF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1