Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e97841170c1fec1…

MALICIOUS

PDF

92.8 KB Created: 2021-08-08 14:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 304e141023caf3741629c9624c1c45f3 SHA-1: 6e9ea5b12fcf1d7540935527039a16822ac19d1b SHA-256: 8e97841170c1fec18a3ae76dfe48d600363b9825d824dc31f6b2efd610e1649d
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious. It contains multiple links pointing to compromised websites and disposable hosting, indicating a link farm or phishing lure. The presence of external URIs and compromised CMS upload links suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/72dc22487813138f90fc03bc5e4955f5/sowijipufe.pdf In PDF document text
    • http://htygroup.com/upload/files/xovawuxijowupom.pdfIn PDF document text
    • http://accessibilite-salle-eau.com/ckfinder/userfiles/files/19643937428.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-29/20210429082221347219.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a34bc0c864---50997234902.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/siwimogemiwuxowube.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096315fd7e16---98483509414.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/nogaxizobarasina.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/895e8a1ad1ee5471e0c0c9a5cf639863/20779166554.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/samizuluponasisalakaxitu.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16096ffc636193---befutijim.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd3fc3d441---tagefojaxamazebonosajuba.pdfIn PDF document text
    • https://juegosinflablesarizona.com/files/dotabi.pdfIn PDF document text
    • https://carsen.sk/editor_uploads/system/files/xetizaruxosuxunazusem.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/posuvabagopagaledixud.pdfIn PDF document text
    • http://jpind.pl/userfiles/file/90390785887.pdfIn PDF document text
    • http://prochem.vn/images/uploads/files/sugonojozexap.pdfIn PDF document text
    • http://biaikatolikus.hu/files/file/furum.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/49277588775.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160720e4969d8e---putuz.pdfIn PDF document text
    • http://masterref.ru/editorfiles/file/75869897232.pdfIn PDF document text
    • https://www.caissedesecolesdu5eme.fr/backoffice/ckfinder/userfiles/files/8043842720.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/sejisolowozer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=do+i+need+to+print+out+my+boarding+pass+for+southwestPDF 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_off000103fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103FE 11340 bytes
SHA-256: 75877b208f1c55a96c6e107546404ff832a31c6d8419ac6d596be7d863b47b73
font_01_sfnt_off00011e20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E20 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013632.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13632 17724 bytes
SHA-256: 4c308adbc64ed6dd13c916aec0ddbcb39083cb236b169489ace9ee7ddf81f370

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