Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e41b13b925306dd…

MALICIOUS

PDF

81.2 KB Created: 2021-08-01 02:30:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7a46a427acdde093f86c62dead68e635 SHA-1: 2d932167e7bf9ec386b784b9814ae8a13f1ee4ff SHA-256: 1e41b13b925306dd864241c6905e3c39334525b1f51a1ab05b176f6dfc67e9ad
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that point to various websites, many of which are hosted on compromised CMS platforms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware-hosting sites. The presence of multiple link farms suggests an attempt to obscure the final destination or to leverage SEO poisoning.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/j89gpt11n0ivvc6841i04ka65o/43100079486.pdf In PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2560aa76a---4120065062.pdfIn PDF document text
    • https://htchninc.com/d/files/salokapufap.pdfIn PDF document text
    • https://www.dars.bg/ckfinder/userfiles/files/4021523172.pdfIn PDF document text
    • http://kiszelyugyvediiroda.hu/docs/file/90299832371.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc24451a6d---vukusidali.pdfIn PDF document text
    • https://svltv.in/userfiles/files/41011680505.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/22094049587.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c812f5a73d---vuguvebikixuwalanewinize.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/b92ad4dedf347dc5209481c6884bd9b2/sotuve.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/seminodepidetuwikusadig.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16089b71172e79---40449319510.pdfIn PDF document text
    • https://rescue.bg/wp-content/plugins/formcraft/file-upload/server/content/files/160bfb4fe4eed1---3599637942.pdfIn PDF document text
    • https://camelcarpet.org/d/files/lizamu.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/reredaxok.pdfIn PDF document text
    • http://murphysbeads.com/clients/54316/File/xewefijixesazizi.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/ng69dmplhm0g294f1qtblgb8h4/88855786258.pdfIn PDF document text
    • https://fallsplat.se/file/52547420621.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/8671a29b8804df47fae169be3ed7a735/26995599277.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c066025015c---gowopasefogunukolalurobin.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/rabubolixu.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/99532319285.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/30359bf52d1281c23dca9f01558ae9f4/rezelejolilulobizoxosaka.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a0635352ac8---vipadoniguvomunogopitanej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sherlock+holmes+2+full+movie+download+in+hindi+hd+720pPDF 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_off0000d48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD48E 11500 bytes
SHA-256: 552fb236eda9e5ead4a1a2cdf19aff70f0c986180c5c63c85e4f06d0a404b5c3
font_01_sfnt_off0000efbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107CF 17112 bytes
SHA-256: 4f40a01fac089f817a7b6243f81b9378c6b9a1be7a0a571b9ce6bcb8fd26c9db