Malicious PDF — malware analysis report

Static analysis result for SHA-256 9393774d993c0e4d…

MALICIOUS

PDF

114.1 KB Created: 2021-06-28 21:17:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2721b35b7b5e8c7b79b3a170ee92665a SHA-1: e751d04a957b2ae0dd4d6f17a3791a647c4fb618 SHA-256: 9393774d993c0e4d9bc5dee9943b111a79371082f20ef1a5beaa26b1508f3e1e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and by an ML classifier with high confidence. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting, likely intended to redirect users to phishing pages or download further malicious content. The presence of embedded URLs and the nature of the link farm suggest a spearphishing attachment vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://paillasse.hu/userfiles/file/91146165373.pdf In PDF document text
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/1434c9402e6585833b0e778c64bc15c0/jokabutikot.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/19182466430.pdfIn PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/7cc0f030a1c3e236af245a72fe0b0adb/lukesavexenuguduvavugike.pdfIn PDF document text
    • http://canadanur.com/resimler/files/89921847951.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c2e0924a20---72172341102.pdfIn PDF document text
    • http://mtcclassof81.com/clients/0/0a/0a45bd3013a8cc77df817aa526a911b1/File/65111091073.pdfIn PDF document text
    • http://chocoenglish.com/_UploadFile/Images/file/nosalalowedijoruxabivip.pdfIn PDF document text
    • https://efnnma.org/files/file/muwoxezewiranati.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b3ce6dcba9---68186115677.pdfIn PDF document text
    • http://heninrealty.com/userfiles/files/38676370145.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160badbaa8fa60---kabojak.pdfIn PDF document text
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/3d0b64cf9016dece678a64d5a89d6e03/nadikinegig.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160959c4d14389---bulenolut.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/2a95ccefc85bd2d217d97333e276e298/88670889431.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834dcd6d7b3---jajovomofiv.pdfIn PDF document text
    • http://inncredel.com/uploads/pivegasojipa.pdfIn PDF document text
    • http://nexxosrealty.com/userfiles/files/90084443766.pdfIn PDF document text
    • https://heyratacademy.ir/file/vozuwosevimobewokedalumun.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/91ic4tdhc5md43er4sqmt8otev/wugusidulodiva.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/xuwapizipeweburosebufuker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=the+cherry+orchard+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015215.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15215 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00016a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A2C 10284 bytes
SHA-256: d137199d7d9bfbe72cfe04f368a9de2152f08a04f7994f126e09278d2bced3ab
font_02_sfnt_off0001816c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1816C 25092 bytes
SHA-256: fa392d4a291e51297f49c62406dd99fac373a559094ae88a8850fbceed80ef1e

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