Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad89f4f0e1477822…

MALICIOUS

PDF

97.5 KB Created: 2021-09-08 11:11:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7264248880d16a97f0941b0aabb35bb SHA-1: 3851985d302c6ef483f0baa18edb2b0540ec16fe SHA-256: ad89f4f0e1477822cc92b32550d4500b57cfb7c7b7ca4b794dad1f1a1d00f450
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised or disposable domains, suggesting a phishing or malware distribution attempt. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports its malicious nature. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL patterns indicate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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://oniceh.ru/uplcv?utm_term=overlord+light+novel+pdf+online PDF link annotation
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/22290611455.pdfIn PDF document text
    • http://abwcrainhwy.com/uploads/files/95973725201.pdfIn PDF document text
    • http://goldmustang.ru/files/files/83850492804.pdfIn PDF document text
    • https://madeirashopping.com/userfiles/file/texuw.pdfIn PDF document text
    • http://pet.nfe.go.th/m_site/ckfinder/userfiles/files/repapakobana.pdfIn PDF document text
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/0fe384bad556583049480eaf85d8a179/biwigunufajuzi.pdfIn PDF document text
    • http://sahrugs.com/userfiles/file/jajunidanifukeg.pdfIn PDF document text
    • https://alstar.uz/images/shared/file/26651520730.pdfIn PDF document text
    • http://eko-inwest.eu/upload/file/90874684547.pdfIn PDF document text
    • http://alphasigmaoverseas.com/userfiles/file/67236238901.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ojk09g715gsv7rbfcitq4pue65/81585793457.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/rabativiwanibid.pdfIn PDF document text
    • http://thienanglass.vn/upload/files/79013269201.pdfIn PDF document text
    • https://norservis.info/files/files/wegofoj.pdfIn PDF document text
    • http://eternoohydro.com/d/files/raguwofetu.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/d942d6b5ef0b1230c995867f959a19ae/3212052489.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608acc84eb83e---98572767849.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/98047708565.pdfIn PDF document text
    • http://ikra-ekb.ru/files/fckeditor/file/repilejewugusaz.pdfIn PDF document text
    • https://mut-zur-veraenderung-hambuch.de/userfiles/file/vanubosaxumuxutifepika.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/876b97cc90ca16d56bcf85e749ffc088/serijogurebojidiperarezev.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/76536866474.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/161120ab7c61bc---8378787550.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_off00010bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BB5 23168 bytes
SHA-256: 8b95b014f66d7baace068353caf5fa2aaf7c516002f6be77cc1622c00dcccd13
font_01_sfnt_off00014896.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14896 10540 bytes
SHA-256: e88edacc1dba4005f082dfa3ac4d97e673afec1da230c838f1d62bf05342f275
font_02_sfnt_off0001604e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1604E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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