Malicious PDF — malware analysis report

Static analysis result for SHA-256 a186ab8cffb185e8…

MALICIOUS

PDF

79.8 KB Created: 2021-09-19 14:47:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: aa9580fd71e5ff79040c8d78082a13ac SHA-1: fdc2b8d29958d0e097cdb8c1de1999c8279e0c36 SHA-256: a186ab8cffb185e851517420998e20d2c169e8b1ee9eae690747e60c596c5848
156 Risk Score

Malware Insights

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

The PDF contains a link farm that points to multiple disposable hosting sites and compromised CMS uploads, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious content or exploit kits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://venefoil.com/ckfinder/userfiles/files/welutuledebopu.pdf In PDF document text
    • http://hbaoge.com/upload/files/97816669623.pdfIn PDF document text
    • http://sungwoo-n.com/userfiles/file/getanujolobupiv.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/30823145578.pdfIn PDF document text
    • http://geoman.cz/data/file/11536636668.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/xupobefajokazajon.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a3da477a9f---kepamexesivamedeted.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/fevop.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/58793453229.pdfIn PDF document text
    • http://mrrb.nexgendevgroup.com/files/64926676992.pdfIn PDF document text
    • http://oreoltour.ru/sites/default/files/file/12532317077.pdfIn PDF document text
    • https://rippa.pt/files/file/limoferuzoronarek.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/854b8adea83c14434558eb87b7ac06c8/pumorov.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/denewadivesetexatodek.pdfIn PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/j2pti30l9itg74jv9mem7lgpls/29831032935.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/rukapawekogekemoxekuwuna.pdfIn PDF document text
    • http://cupta.org/userfiles/files/20210904115045.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/bikosuzidamam.pdfIn PDF document text
    • http://midel.me/userfiles/file/goxidisajujigopapoloxedo.pdfIn PDF document text
    • http://marymo.ru/uploads/files/vebuv.pdfIn PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/20020012241.pdfIn PDF document text
    • http://ride-on-earth.com/images/blog/file/supilefamizasobeziraz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=shameless+season+11+episode+9+123moviesPDF 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_off0000d12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12A 18176 bytes
SHA-256: 026ab71510e33982d9dc25ac06d43e153377cc45c10e85cb959ee658bf1dfa44
font_01_sfnt_off0000ffcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFCF 11112 bytes
SHA-256: 8780caad12fd8ba46eea6cff3adeea4296cb3ec426f110739961e24ed6bd43bf
font_02_sfnt_off0001199d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1199D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1