Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c986fa9110be289…

MALICIOUS

PDF

100.4 KB Created: 2021-07-27 18:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4422bae230686dc6fdd816c9a15027e0 SHA-1: 04f683ef945658cb09dbd3d8ac56726c126cc99c SHA-256: 2c986fa9110be28974f0733422caa328b51558f7d5e23373fa0955ad94193bf9
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress upload directories and disposable hosting sites, suggesting an attempt to redirect users to malicious content. The PDF's structure and embedded links are characteristic of phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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 http://csss77.com/clients/d/df/df7f2fdc42e243c7a03c192a8228c0be/File/ginid.pdf In PDF document text
    • http://mikailang.net/userfiles/file/20210504085256_1478819199.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16093b2414105f---pozafilogu.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607556477c50d---65302836094.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6f3dba582b---61918202730.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c8470b3544---kadiworarezonapimawinebe.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/ccd7b2be0aa1ce149df478414964bf7e/gusoxudamotavoxe.pdfIn PDF document text
    • http://ytovietnam.net/ckfinder/userfiles/files/dozebapunebobuvabopaso.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3cd0f8fd58---kutelexoromimakikuvivuvub.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/3l5aeshnao5prt25onit87rb3c/fovupa.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/komekusonaxilab.pdfIn PDF document text
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/160804aee32791---34594386565.pdfIn PDF document text
    • http://anandamsanyal.com/userfiles/file/xelopizigutitobuzenigaf.pdfIn PDF document text
    • http://all-pass.com/folder/editor/file/faxuvirigasejazorigabosi.pdfIn PDF document text
    • https://foulardfotografando.it/file/runotom.pdfIn PDF document text
    • http://hamkr.com/userData/board/file/sakewuduruxadujobotatut.pdfIn PDF document text
    • http://samtekelektrik.com/files/42894751538.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/lopedipamanutavudabewojas.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210703_DAC37E6F9093034E.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7808db2d63---fevigobesatemipatiruduso.pdfIn PDF document text
    • http://tlxzkj.com/uploads/file/090642327498.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/f03ce38410118554d2e1176491d902ae/tutofusanepigupuju.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=obstructieve+shock+behandelingPDF 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_off000123db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123DB 17220 bytes
SHA-256: e8d84dc85c2c762d8cda1bb46cb315732ad8408aec4967a4d41c3b7c7bbd8cf8
font_01_sfnt_off00015027.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15027 11072 bytes
SHA-256: 2ff92d0767b03ff814dc335674afb627090c185c43f541c8161ecd3e57252818
font_02_sfnt_off000169c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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