Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a1448a24eda6c5d…

MALICIOUS

PDF

82.3 KB Created: 2021-09-14 05:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c19d8ce14ed04f93156bea118fdb8636 SHA-1: f34f3151d56be4a4af01e3ade9d691668e95a5f1 SHA-256: 4a1448a24eda6c5d38466cdb6ecd869538e3ab5415a67e48173c0d1a562ba7d3
156 Risk Score

Malware Insights

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

This PDF was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress sites, suggesting it's part of a link farm designed to lure users to malicious content. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure and URL targets indicate a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/1aa80c6701c2848b469741cb90155de8/5478828923.pdf In PDF document text
    • http://effektfilm.de/files/file/majivoxozegat.pdfIn PDF document text
    • https://innovativallatgyogyszer.hu/fileok/file/92970596124.pdfIn PDF document text
    • https://krainaogrodow.eu/zdjecia/fck/file/96658447625.pdfIn PDF document text
    • https://wita.lt/images/files/43303487898.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/nunefewobibuvemeruvi.pdfIn PDF document text
    • http://knupress.com/pds/editor/file/40530490590.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/41831124665.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/dokaxikokajapesapuwa.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/42510437776.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9becbc147---bajafuwujitaxupofesu.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/83627790452.pdfIn PDF document text
    • https://champion-osk.pl/userfiles/file/rirori.pdfIn PDF document text
    • http://oiseau-bleu-morzine.com/userfiles/file/54636320514.pdfIn PDF document text
    • https://markiza-trade.ru/admin/ckfinder/userfiles/files/devodituvenuxitezat.pdfIn PDF document text
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/0r1t6fl69e44ppll3hg2v3rs8b/64863872546.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/19797312237.pdfIn PDF document text
    • https://eownauto.com/uploadpic/files/zajubiwizolixiwogujafez.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/purinipiwajunidugexej.pdfIn PDF document text
    • http://turinhotelcompany.com/userfiles/files/fiteduroxukilukinekebo.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/koseluluravigele.pdfIn PDF document text
    • https://isleo.com/i_photos/file/34711050533.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138215131ad5---21951925259.pdfIn PDF document text
    • https://groupunsur4.com/contents/files/vubowuzi.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/74205172440.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+hide+photos+in+gallery+androidPDF 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_off0000db2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB2D 10864 bytes
SHA-256: 45c50034f68634b94cfbc6b4ead417c09b082f3a5d14f154a9f9843209843df3
font_01_sfnt_off0000f404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF404 18420 bytes
SHA-256: c049fd0bbdd7ae33a518aa88de513c3ef8e8782d3a8ef10897ba9868895d7938
font_02_sfnt_off0001235a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1235A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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