Malicious PDF — malware analysis report

Static analysis result for SHA-256 27d7a3f491dd1e2d…

MALICIOUS

PDF

120.9 KB Created: 2021-08-19 00:20:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: eda124becf3d471215e99ac1d93d3ac1 SHA-1: 0ed693eff79f26658bad19e925970ee89ff59980 SHA-256: 27d7a3f491dd1e2d585d84ccc977df216ea131bf0760b8811eacd3296d9aa68b
164 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection as a phishing trojan. The presence of embedded JavaScript and a large number of external URIs, many hosted on compromised WordPress sites, suggests an attempt to redirect users to malicious content or phishing pages. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure points to a malicious distribution mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://catamma.ru/uplcv?utm_term=slumdog+millionaire+full+movie+download+in+hindi+720p+filmyzilla PDF link annotation
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160c774c493c28---57514496131.pdfIn PDF document text
    • https://btsmstlucia.com/atomicsteps/upload/userfiles/file/venerigewiw.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/42694430415.pdfIn PDF document text
    • http://park-seversk.ru/other/js/ckfinder/userfiles/files/54552858082.pdfIn PDF document text
    • http://www.hkrns.org.hk/ckfinder/userfiles/files/fiwabamafokinevojatidok.pdfIn PDF document text
    • http://hoteldanang.vn/uploads/images/files/94413380694.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/gikifusunodafopitativ.pdfIn PDF document text
    • https://internationalmedia.com/userfiles/file/tafobotosi.pdfIn PDF document text
    • https://papiratisk.cz/soubory/xeripafanekovepilikono.pdfIn PDF document text
    • https://laflammerouge.ch/userfiles/files/takudufejuzoporusapeje.pdfIn PDF document text
    • http://ck-tct.ru/userfiles/file/sivotanikusozuxetelin.pdfIn PDF document text
    • http://www.redactordecontenidos.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bc284b26e91---muxolosupokoxepewofike.pdfIn PDF document text
    • http://ebiocell.com/uploadfile/file///2021061910490547.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/faruloxu.pdfIn PDF document text
    • https://istanajpdua.com/contents//files/zifezef.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607374337fbd0---93099642503.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966ed73d322---zopuga.pdfIn PDF document text
    • http://someteme.com/archivos/_20210728064136.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/gurunifinemotejufi.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608003685ac90---56280075933.pdfIn PDF document text
    • http://passaicvalleyclassof1957.com/clients/44362/File/32300887683.pdfIn PDF document text
    • http://ajivikafinance.com/userfiles/file/68479705688.pdfIn PDF document text
    • http://clinicaveterinariamontecchia.com/userfiles/files/44133498013.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/5e6c6023c9787304eedb3654f02a0aff/xewivavotikasiposo.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_off00017206.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17206 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00018a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A1D 11472 bytes
SHA-256: 5faacb0cc2676821a8648a29abfc406c3fef5238f80274d8dd17728294576c67
font_02_sfnt_off0001a4f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A4F9 18068 bytes
SHA-256: 874ba7f09c7b45cd119f7230bccc2ad736a301f275b898daa34232b18f647534

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