Malicious PDF — malware analysis report

Static analysis result for SHA-256 c69a45aaf44475a6…

MALICIOUS

PDF

86.4 KB Created: 2021-09-10 22:32:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8065e87eb6c4c34af2e8f3e0c7c5dfc SHA-1: ac1bf9984f04c5c54fb0224c5519b1537137ac11 SHA-256: c69a45aaf44475a6b181ed73705aaa10204bfba4bbaab5a4bf53bda2683df9b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating an attempt to manipulate search results or redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://clinicaveterinariailmarzocco.it/userfiles/files/zatudutit.pdf In PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/34305152027.pdfIn PDF document text
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/saluzinav.pdfIn PDF document text
    • http://ihdbd.org/upload/files/99603914847.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/maxepuziretisatumesed.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1613244b551f3f---serakokev.pdfIn PDF document text
    • https://mabuksusu2.com/contents/files/34076667216.pdfIn PDF document text
    • http://dongzzang.com/userfiles/file///jemedibudidiw.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/7374671173.pdfIn PDF document text
    • https://luminex.pl/upload/file/99226160532.pdfIn PDF document text
    • https://kaimano.it/file/9715463179.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136714122d68---18677592904.pdfIn PDF document text
    • https://confidence-ist.com/ckfinder/userfiles/files/dowoledefizugiko.pdfIn PDF document text
    • http://karimeh.com/public/userfiles/file/36072639065.pdfIn PDF document text
    • http://pronobile.de/catalog/file/bopisam.pdfIn PDF document text
    • http://auburn-properties.com/userfiles/files/jorepetobuse.pdfIn PDF document text
    • https://inchiriereelicopterromania.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161330c65e35b8---wolutarivakarenexedimolo.pdfIn PDF document text
    • https://www.ksmt.edu.np/assets/ckfinder/userfiles/files/zizuzamilovadasanu.pdfIn PDF document text
    • https://easresidence.ro/app/webroot/files/userfiles/files/ramolezesuluvozipanupodet.pdfIn PDF document text
    • https://dom-titan.rs/files/foliladufopokazodif.pdfIn PDF document text
    • http://istihdamhaberleri.com/upload/ckfinder/files/49475408400.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138e8f9cc5a5---pirukonulunadumi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=how+to+see+private+account+photos+on+instagram+2021PDF 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_off0000e944.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE944 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001015b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015B 11312 bytes
SHA-256: 0b690af18cde60b3988051680708c26e15bcce79b15d20cc89025877c25550b1
font_02_sfnt_off00011bdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BDF 18292 bytes
SHA-256: c21f0bfd412f105f387fdf611acdd16ed9fc3e20dee6545c4926fb533b536f4b

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