Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c65af8334f53ea0…

MALICIOUS

PDF

85.2 KB Created: 2021-09-01 01:55:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 10838640bf7a40e56d0a6c732d5a03ab SHA-1: de6cae19fdbdda00a43a433c9009bcac0a7f1e0b SHA-256: 0c65af8334f53ea01a06b30b01fafa8bb3e3edf1df0c891d163bcb9d96191c9c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file contains numerous external URLs, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://oniceh.ru/uplcv?utm_term=making+bread+in+stand+mixer PDF link annotation
    • http://esebtekstil.com/resimler/files/12110204603.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607bfbb37f94b---52576639891.pdfIn PDF document text
    • http://89928386.com/uploads/files/202108180441337409.pdfIn PDF document text
    • https://ip-kamera-rendszer.hu/ckfinder/userfiles/files/jatajaz.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bda553de74---tetamikopaxoxixiras.pdfIn PDF document text
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160966896dba3a---davamubi.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607b40816a55c---niveriv.pdfIn PDF document text
    • http://fashioneducation.ru/userfiles/file/gatefomu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd1e8c584---bokolozutatuviduga.pdfIn PDF document text
    • https://miguktour.com/FileData/ckfinder/files/20210625_1B38ACA4C39E2E30.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/422512e722e24fe65fcfbdaf63b4bd06/kivijuzetezujo.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091027899c09---45510815084.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/mo3fnobpp1phddeqsip3s6li1u/78201949780.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/8b6ce03421085b6c1a9db2188e7172f1/74485958457.pdfIn PDF document text
    • http://uptownfallschurch.com/uploads/files/8697192152.pdfIn PDF document text
    • https://branchennachweis.eu/userfiles/file/72639801818.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/dawosopezada.pdfIn PDF document text
    • http://tekizolasyon.com/ckfinder/userfiles/files/37034452260.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/81658446278.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ad51e7429e9---31633249573.pdfIn PDF document text
    • https://garyjetcenter.com/wp-content/plugins/super-forms/uploads/php/files/3211bc257f3b54cdb0f04fbcd81a2d21/vexogaxu.pdfIn PDF document text
    • http://phannhan.vn/files/usersfiles/files/sizerinogovijubenum.pdfIn PDF document text
    • http://lindendirect.com/tempimg/file/13913007390.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/d8bfa0ae8d5f849bf6626ebc392de5ad/76066383497.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_off0000e8ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8AD 17348 bytes
SHA-256: 83bee490f888c184bbc538b8eaaf86c75df1ec3de70250dc51c54e5a7d350e1c
font_01_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012dac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DAC 10752 bytes
SHA-256: 9b620ff5ca80a3317e1cb6d4c3deae578f7961c8fd9b3ea9071e7eae02d3ed4d

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