Malicious PDF — malware analysis report

Static analysis result for SHA-256 baf849d0493c0d77…

MALICIOUS

PDF

78.1 KB Created: 2021-09-04 06:54:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 8f7e4e7518c8f3f193f11e3211371f4f SHA-1: 0798a92ea2e583098ee3d2f690e62ad836fc9f7f SHA-256: baf849d0493c0d778b1a9b5bd371e1a7035d9cd93342744c32d072a67a7cf78c
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=overpopulation+articles+pdf PDF link annotation
    • http://startmatbaa.com/userfiles/file/pumiziwogoperaf.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/7e496f4849b5981c95da0acd61b17be4/senisoxeweguruzedowigil.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d448ea40dc1---51736334684.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aca733c922f---1768297248.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609c9b49249e4---vekukizowenijumo.pdfIn PDF document text
    • http://artiguardia.pl/userfiles/file/pekazanibepuramibalubozaz.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/jupekeledimodidaxibejolet.pdfIn PDF document text
    • http://aihyang.com/userfiles/file/71574528882.pdfIn PDF document text
    • https://rendszergazda-cegeknek.hu/ckfinder/userfiles/files/28825588197.pdfIn PDF document text
    • https://bem-sa.com/img/file/96890657993.pdfIn PDF document text
    • http://gramercygrand.ru/files/file/17317195383.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/40328641493.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/e3f08a0b4994a866f23c9d67416ef6f4/51975823868.pdfIn PDF document text
    • http://www.vikingmaterials.com/img/futusewuwa.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/61a9bcd1f654d4b70932d9875077fd31/xisezo.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a46fbad4f96---zuzumofemanogufujufoke.pdfIn PDF document text
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c29848ebeed---ramexidakewilavaxokajojeg.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/28909826740.pdfIn PDF document text
    • http://xn--eyt274i.com/upload/files/11251909669.pdfIn PDF document text
    • http://toonesk.com/upload/bulomigutamoselabadegit.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160fe3ad5b35e2---38093600853.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/3020174245.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_off0000cc66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC66 10804 bytes
SHA-256: 3aa11da2f407f518de604577fe41a712bd48f6e5b471b94d68c6b4f47d906fd3
font_01_sfnt_off0000e571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE571 17708 bytes
SHA-256: b57142d961090406dd394dcc031c63d2ee1966eadbd3d641712a08d2eb606f8c
font_02_sfnt_off00011316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11316 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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