Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e846c75ac93ea9…

MALICIOUS

PDF

72.9 KB Created: 2021-09-03 13:08:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e76857652cdb1adaad42da4103170d32 SHA-1: 12eb4c47bf772699c4f521826b7ecf25af2dd357 SHA-256: 38e846c75ac93ea90a0650b41a85cfcfdc1168d61e94f0798511dd8f8dc90a38
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm containing numerous URLs, several of which point to compromised CMS uploads. The primary URL identified is hosted on chagatea.ru, which is also flagged as a link farm on disposable hosting. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://chagatea.ru/wp-content/plugins/super-forms/uploads/php/files/4f03e809fead208ae0ec665a2e59a927/ladokokemovelopofidekob.pdf In PDF document text
    • http://www.phuongdonggolf.vn/app/webroot/uploads/files/5102588396.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16077501521cf9---navipilasatelumikuzi.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c03a1e74e99---mulufejatoj.pdfIn PDF document text
    • http://timeyear-v.com/userfiles/file/21818103600.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/90058831208.pdfIn PDF document text
    • http://www.cavice.fi/tiedostot/files/kajatogijiwusupubadeveral.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/devusili.pdfIn PDF document text
    • http://hani-bee.com/userfiles/files/juranasoturuvudifiburuti.pdfIn PDF document text
    • https://rasathantrananotech.com/ckfinder/userfiles/files/figinepegidubived.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/23462a7239e98026b0a956d437f80b77/59219810433.pdfIn PDF document text
    • https://nazragame.com/calisma2/files/uploads/niviposobifowub.pdfIn PDF document text
    • http://srihemkuntschoolint.com/slbdavbatala/userfiles/file/nomelawazaxano.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/muloxiripixezavuveperet.pdfIn PDF document text
    • http://puppiesulove.com/clients/7/7f/7fa6d7836ea929643a3c23f4562b158d/File/fabav.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/wuwutuvaridi.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2d5a47a5b1---90287640786.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/jukubuzawovelet.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/5fa85bae1c26039604ee4d684de4a413/tuxigixixukowobuli.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/57831477321.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/bugitafijabovoko.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/89319830212.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/91466644166.pdfIn PDF document text
    • http://atreve.eu/ubezpiecz/obrazy/file/jaruni.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pulsar+2300+manualPDF 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_off0000bbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBEA 10340 bytes
SHA-256: f55fd45022bdc997a21c5fd560a6f6963ba7cedab2745eb6c530d4a136ddcd02
font_01_sfnt_off0000d344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD344 16416 bytes
SHA-256: 5643e6f7d71cf94f681b915eaa2e72095aa66a9e5d0cb20709ed11551d890a04
font_02_sfnt_off0000fdcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1