Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccceaf9da74ba0f1…

MALICIOUS

PDF

69.8 KB Created: 2021-09-11 22:29:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 86498ac3e33aac07b7432241119c94ee SHA-1: b81cb0907507bdec90df7a9cde04c12e82a8de7d SHA-256: ccceaf9da74ba0f1ec2226bfe7a5e75d5546d7744dd4ca2f1533cc8053f1865d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to compromised WordPress sites and disposable hosting, masquerading as download links for OpenVPN. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a phishing or malware payload. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a phishing lure designed to trick users into downloading a malicious file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.praasia.com/file/files/fuzunugevusolazo.pdf In PDF document text
    • https://stollerco.com/testingsites/advantage_aviation/assets/media/file/sinoropirelemaridodif.pdfIn PDF document text
    • https://eirai.org/editor/ckfinder/userfiles/files/5147545923.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/a65a4583f6f445fe2cc7b46725b0b7df/zujejibitarol.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/14b182162ff5806cc18519029c543dea/50271619892.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/25038555833.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1ff516ff---24493340755.pdfIn PDF document text
    • http://anquocrealty.com/uploads/image/files/60695989770.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/16426185764.pdfIn PDF document text
    • http://bbpcosmetics.com/admin/upFiles/2021-9/file/pitoborebiwapekawo.pdfIn PDF document text
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5b0a46bcb---52863174437.pdfIn PDF document text
    • https://gemma.lucien-sv.info/uploads/files/613875d20b4e4.pdfIn PDF document text
    • http://kingbikeonline.com/images/upload/File/sotomisufizifojelivevunes.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/25871953247.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/5342249245.pdfIn PDF document text
    • http://bergfin.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136f26ca59ab---92534853407.pdfIn PDF document text
    • https://relleno-acidohialuronico.com/wp-content/plugins/super-forms/uploads/php/files/8e63a4c835ea22f37878b2e0ef4a2165/88945920158.pdfIn PDF document text
    • https://expomediainc.com/upload/file/mutal.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/lowozinobeposexuk.pdfIn PDF document text
    • http://thuocamakong.net/userfiles/image/file/60190387712.pdfIn PDF document text
    • http://valeneighbors.com/userimages/wawigiwitinizuduxokosi.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e56e112d6---43081563161.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/161332094bf9f3---bigedibuviwinuv.pdfIn PDF document text
    • http://ihdbd.org/upload/files/baragapopaxi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=download+openvpn+for+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_off0000b597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB597 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA9 14568 bytes
SHA-256: 185453a0d90ab20070951df049e07ac3b9507d782950afa75fc15e8f5ba83ab2
font_02_sfnt_off0000f224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF224 10376 bytes
SHA-256: 0cf2061380749628ab5a15b0a72e79ea81199b63c3c429acfd49f238be3b8bf6