Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00dfa155e59eab3…

MALICIOUS

PDF

70.6 KB Created: 2021-09-26 15:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 906f62468b1753d8a81075925547aa03 SHA-1: 69d613c3bd1038a2ca842469edda5a6c7cabbbe3 SHA-256: f00dfa155e59eab3105b3384fa604c507b26279ab59dbc3d6db5f77aa781edde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised CMS uploads and disposable hosting sites. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://burchiellati.com/file_fck/file/90399439360.pdf In PDF document text
    • https://s-h.cc/uploads/files/202109260457257457.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/810610daf40213dc42725ba4bb97794b/31457949557.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/51085054155.pdfIn PDF document text
    • http://benly-carson.com/product/files/47653939786.pdfIn PDF document text
    • http://nemalipics.com/ridixulonofabe.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/71f1b05fc983fd195356684f888d15f2/71188774821.pdfIn PDF document text
    • http://theonejsc.com/userfiles/file/73534517886.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/julubagezezuju.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/1615036b891c7b---newirogu.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/653ebb45ab27235635fbd92e632e0c0e/71596415195.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/95833382399.pdfIn PDF document text
    • https://funbugs.ie/userfiles/file/sanolipepojemokar.pdfIn PDF document text
    • http://andreuma.madteam.net/ckfinder/userfiles/files/bufenawe.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/xuvawep.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ec19cd9268---mudinesoridifof.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/77642682956.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/8872600480.pdfIn PDF document text
    • http://xn--90aoj0agf7cq.xn--p1ai/uploads/files/28984924346.pdfIn PDF document text
    • https://galerie-louise.be/userfiles/files/wikagabepigedokeve.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/161397a79910ce---66792683364.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mac+photo+to+pdfPDF 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_off0000b03e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB03E 10068 bytes
SHA-256: 8f382246d4810ab65ebd1d5c2f56f9398b18ecd96b149c38a9ca235b06c43915
font_01_sfnt_off0000c6cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dedf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEDF 18184 bytes
SHA-256: 47726db0ab10fc9c45dd4b90f040d83ec897d2d2ba4a1f00169d6e6e8777d998