Malicious PDF — malware analysis report

Static analysis result for SHA-256 e266c89fb66fae55…

MALICIOUS

PDF

77.1 KB Created: 2021-09-10 05:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 9d3118b88c1a9925e30527d28711e95e SHA-1: 89dc3c5d0518d8a0c762a470e2344680d32fc8af SHA-256: e266c89fb66fae552795b3e48606777e4294257edb927882e2197db8a3091400
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of a link farm pointing to multiple distinct hosts, some of which appear to be compromised CMS uploads, further indicates a malicious intent to distribute or host malicious content. ClamAV detection as 'Pdf.Phishing.Trojan' reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

Heuristics 7

  • 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.
  • 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 http://sindikat777.ru/ckeditor/ckfinder/core/connector/php/uploads/files/38543376698.pdf In PDF document text
    • http://kingsauto-bar.com/js/upload/files/57928081037.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210903090508.pdfIn PDF document text
    • https://warsztatgdynia.pl/app/webroot/media/files/11894727768.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161371854d447c---sojisidozob.pdfIn PDF document text
    • http://zeminyerkaplama.com/upload/ckfinder/files/99910715737.pdfIn PDF document text
    • http://estatepie.com/files/userfiles/file/zetejukibofenukejivadumo.pdfIn PDF document text
    • http://swiss-ex.com/images/blog/file/32864120400.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/ruzejikelavagomukojivamok.pdfIn PDF document text
    • http://buyyoutubecomments.com/ci/userfiles/files/8096763341.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/jabenenutum.pdfIn PDF document text
    • https://www.igescanada.com/ckfinder/userfiles/files/33643132760.pdfIn PDF document text
    • http://gelinyuanyi.com/upload_fck/file/2021-9-7/20210907182403691453.pdfIn PDF document text
    • http://beganijewellers.com/ckeditor/ckfinder/userfiles/files/beririkewarazubalonisaw.pdfIn PDF document text
    • https://drainscovers.com/wp-content/plugins/super-forms/uploads/php/files/091889b940fe13e413194dd0f16f4af5/37174949767.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/fevetoj.pdfIn PDF document text
    • https://komunalno.vrgorac.hr/files/vavugosipekuwuleso.pdfIn PDF document text
    • http://etre-belle.su/images/file/zaguwitejixizem.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/7701463156.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/161398589b5fcc---90836409498.pdfIn PDF document text
    • http://luxmeterthai.com/ckfinder/userfiles/files/sojaw.pdfIn PDF document text
    • http://factorycontrolprojects.com/userfiles/file/pekifol.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1613076d63c67c---kanikinukore.pdfIn PDF document text
    • https://feldmann.pl/userfiles/file/19453995661.pdfIn PDF document text
    • http://omgmediatank.com/userfiles/files/40292197141.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=lords+mobile+tower+defense+hack+mod+apkPDF 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_off0000bddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDDF 21128 bytes
SHA-256: c7319477765cc7b41c4090209b2943841b5d8cfa04c66f25feb66afcf0594dd3
font_01_sfnt_off0000f51e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF51E 11160 bytes
SHA-256: 55b74d9658203fafcafefc824b3244ef0f67c752bfa0e8a1b91e14ad871376e5
font_02_sfnt_off00010ed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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