Malicious PDF — malware analysis report

Static analysis result for SHA-256 71c3ef0d87f71f68…

MALICIOUS

PDF

71.4 KB Created: 2021-10-01 13:14:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: f62a133fea532ac9b4c5497628445d7f SHA-1: d936b031ed573c67736e397729b679d3ec34cb07 SHA-256: 71c3ef0d87f71f68c9192964823f8e9589a81e8c4522656eeed74c628d204a5e
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and link farm structure suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=android+emulator+for+app+testing PDF link annotation
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/zatixexukesesebafifu.pdfIn PDF document text
    • https://sonerofset.com/userfiles/file/mivifise.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16152e5afbbf1e---32880874351.pdfIn PDF document text
    • https://alkoplast.rs/files/22493302641.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/zikuzixisepebake.pdfIn PDF document text
    • https://alemarferries.alemarsnp.gr/ckfinder/userfiles/files/37671325652.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/26012063757.pdfIn PDF document text
    • https://www.carnesvarejo.com.br/assets/ckfinder/core/connector/php/uploads/files/nadogurunafokusomile.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/d50ea645ab54eae0950fde2c5858b25a/26222213276.pdfIn PDF document text
    • http://ramenzoni.eu/userfiles/files/1094190810.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16147f15f09ca6---sifuzewepelezufulukadu.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/a146f7028c7f7d0ca0eaba1136e1d04f/7764329512.pdfIn PDF document text
    • https://biothiennam.com/media/ftp/file/kazekosavoxawazositilosa.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/42768436520.pdfIn PDF document text
    • http://santiagoporter.com/js/ckfinder/core/connector/php/files/vevabosutif.pdfIn PDF document text
    • http://keystoparadise.com/userfiles/files/83923230455.pdfIn PDF document text
    • https://padservhosting.com/userfiles/file/feborizupibebevarovegoko.pdfIn PDF document text
    • http://daydeothe.vn/rich_editor/file/62678245501.pdfIn PDF document text
    • http://ajisushionline.com/uploads/files/12197278489.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/98808251905.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16145652d76c8b---36648859638.pdfIn PDF document text
    • https://ptogel1.com/contents/files/bunudafawuxaromoxizudu.pdfIn PDF document text
    • http://laserinnsbruck.com/static/pivomikower.pdfIn PDF document text
    • https://phr4u.com/files/xitobizaromixofazotaz.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_off0000b40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB40A 16588 bytes
SHA-256: a2adeab05d7a572e52911fd5286b639c9367feb36fcc1743c6f4359921c00e84
font_01_sfnt_off0000de98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE98 10924 bytes
SHA-256: 2842a3cb95304fdf8b19310c72b2dda3a3661856edb07657008d3601cff90836
font_02_sfnt_off0000f7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.