Malicious PDF — malware analysis report

Static analysis result for SHA-256 9676e9570233dac9…

MALICIOUS

PDF

134.2 KB Created: 2021-09-08 18:10:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9e153f0277eb915079c43e67d4236ad8 SHA-1: 56d3110a79a7d3ded7f7f9f5ef4c3d1f59862411 SHA-256: 9676e9570233dac935122ee089299e515bcfb3d4cbcf7c180d9b0c97fa598973
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://cructi.ru/uplcv?utm_term=critical+companion+to+william+butler+yeats+pdf PDF link annotation
    • http://rmgoals.com/userfiles/files/52754607117.pdfIn PDF document text
    • https://szabolcsipeter.com/userfiles/file/xefowinosozezisatas.pdfIn PDF document text
    • http://elsped.hu/files/file/vatutajetilabixe.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/tivesuwovusitikazes.pdfIn PDF document text
    • http://reichspfarrer.sk/file/55551649207.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613861c70f3bf---fozizonekakosuremezola.pdfIn PDF document text
    • https://senfina.top/uploads/files/kewuburun.pdfIn PDF document text
    • https://lensmam.com/userfiles/file/15821701174.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/rijodim.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/tutubowezujego.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/givumulamuwuloraj.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1612fccd9ea0f8---85079694482.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/re60otacgm15pgcbqhk9irvdq4/regexatutudakul.pdfIn PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/2135288459.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/4f40127e81772cbad5f10cf4f0939c45/67472094968.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/bezejedatinewajuwafo.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16130c1cdadd23---nefotamanepobetudajufuk.pdfIn PDF document text
    • http://grimastone.ru/files/zuvijaginaxado.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/kesunuteza.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109080452559609.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/80973816668.pdfIn PDF document text
    • https://wheelmartthailand.com/image/upload/File/torugagivigow.pdfIn PDF document text
    • http://tech-in.info/bramy/userfiles/file/78418783989.pdfIn PDF document text
    • http://montpellier-businessplan.eu/mbp/upload/images/images/upload/ckfinder/fowojasirisurenifogifowaw.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_off00019f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19F36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001b748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B748 21104 bytes
SHA-256: 498e8d11545dd83a201f0607b12bdab644c393d72ec7268f23c86eede522804f
font_02_sfnt_off0001ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE0F 11252 bytes
SHA-256: 25d457a8bddb7bdb1fcccbfb28db88d67ad667c5ca2ffafceccc653804a5af72

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