Malicious PDF — malware analysis report

Static analysis result for SHA-256 5777f87a90b550ec…

MALICIOUS

PDF

81.2 KB Created: 2021-09-03 10:54:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 0ea179439192de973c8f48d95f4fdfb7 SHA-1: ae742f01c8bfee2a32af6f94f3c08af4b2048d79 SHA-256: 5777f87a90b550ec6e1b9797552b61f71f4fd3046206d56d9e695cd647f9574a
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document may also instruct users to download a password-protected archive, a common tactic to bypass security gateways. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://drafthe.ru/uplcv?utm_term=como+hacer+un+dobladora+de+lamina+manual PDF link annotation
    • https://businessservicesuk.com/userfiles/file/49412976838.pdfIn PDF document text
    • https://forcechicago.com/wp-content/plugins/super-forms/uploads/php/files/4f31b41a4f24797b60d482994535dc9e/biroj.pdfIn PDF document text
    • http://www.empresasdelimpeza.info/wp-content/plugins/formcraft/file-upload/server/content/files/160ba0bb7b015e---lavagabagapejije.pdfIn PDF document text
    • http://lineshare.net/upload/files/20210830180725.pdfIn PDF document text
    • http://pobierzplik.pl/uploads/files/kokin.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c52c3247961---5505698624.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086bb2696cc4---94378828197.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6a30abfd9a7f6d4205be4bce97be06dd/64263484918.pdfIn PDF document text
    • http://moscowballet.ru/userfiles/file/81941197900.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/396511bd5de7ecb98c1aa8d33cafdd70/7936448676.pdfIn PDF document text
    • http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/69412125169310cb9f4aa6e7a4834219/79374185477.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/nizolukugi.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160847fe829752---nixatositefodap.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/9ae93c3b7e249d86a4c4d17e493c2fb3/sigeke.pdfIn PDF document text
    • https://mimpishio1bet.com/contents//files/zerugabosapomivevexi.pdfIn PDF document text
    • https://archltginc.com/wp-content/plugins/super-forms/uploads/php/files/2422cf739b62681b46c1cc6c9d798556/13259699943.pdfIn PDF document text
    • https://shayangroup.net/wp-content/plugins/super-forms/uploads/php/files/f5aff8996dc8850b92323c967b694238/kosujedipuzikafe.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/181b0aad053bfd18871e1ef01adbd734/79019440803.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/39298079609.pdfIn PDF document text
    • http://promador.pl/userfiles/file/71940364376.pdfIn PDF document text
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/h3rnjhisf1cvurmmrc0gl4afr5/ponupasezibazugegu.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/zirusejopugokonasorewijim.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/lisexipe.pdfIn PDF document text
    • 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_off0000d4a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4A3 19472 bytes
SHA-256: 1cd07ee1af4d0d4b9a9f4d2de54fde058e659a6d6a3de3adb8b9fbd4e7847911
font_01_sfnt_off00010577.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10577 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8E 10640 bytes
SHA-256: 48775b69f8132bd35293a3f77a7243b75975661f1e2a900764b0bc94e3623139