Malicious PDF — malware analysis report

Static analysis result for SHA-256 2221f8931ed3ae77…

MALICIOUS

PDF

87.1 KB Created: 2021-09-16 21:49:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bbe6723c250ce9f2e16794be27aab4de SHA-1: d86fe4af0fc529949079d231dadf4c1e233ed801 SHA-256: 2221f8931ed3ae77166258d803f8cb43ff9188971f10a23627774714518287a0
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to compromised WordPress uploads and disposable hosting domains. The primary purpose appears to be directing users to external, potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://crysiq.ru/uplcv?utm_term=how+to+get+image+from+assets+folder+in+android
    • http://yule-sign.com/upload/editor/file/20210914093140.pdf
    • http://ylplj.com/ckfinder/userfiles/files/wujasizoduzugedefapa.pdf
    • http://abwingsva.com/uploads/files/27138145840.pdf
    • https://liantoong.com/archive/upload/files/jenepinepuvewu.pdf
    • http://studioiulianella.it/userfiles/files/fitiben.pdf
    • https://genegurumiraclehealer.com/userfiles/file/64707328589.pdf
    • http://hmed.vn/upload/files/62127339783.pdf
    • https://atx-stroy.ru/wp-content/plugins/super-forms/uploads/php/files/e3df5798a7868fc411d033b70e44781a/63087867578.pdf
    • http://cdkuysuujk.handysociality.com/upload/files/64471335807.pdf
    • http://ngocvietbungalow.com/upload/files/tituwixodizavapavub.pdf
    • http://frutapac.com/ckfinder/userfiles/files/15468800842.pdf
    • http://energywork.pl/userfiles/file/maredafunusavewajare.pdf
    • http://denda.co.kr/ckfinder/userfiles/files/kegemetanagofegezisixavan.pdf
    • http://xn--42cfa4ewb0a0b3fwh.com/imageupload/files/14105425219.pdf
    • https://mimpishio1.com/contents/files/75752668213.pdf
    • https://frisch.ro/files/file/67911692478.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130ac389d2e1---27817033049.pdf
    • http://backupcenters.com/userfiles/file/60320569878.pdf
    • http://ledspectrumthai.com/ckfinder/userfiles/files/ximukataje.pdf
    • https://kirmatas.com/userfiles/file/45217716516.pdf
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161403817cae12---42935796901.pdf
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/falefebotexuj.pdf
    • http://sobateracota.ro/mm/file/87510523215.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef5e.bin
e6f77255f455d018814bd94aaabc5f19103ce8201b87efd1af5cd7362cdd59dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEF5E 17536 bytes
font_01_sfnt_off00011d8c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D8C 16792 bytes
font_02_sfnt_off000135a3.bin
e57a55386133e9ab7893b6caf28590ecb4ba58855c6df002243c1269c41b41d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x135A3 10772 bytes

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