Malicious PDF — malware analysis report

Static analysis result for SHA-256 cebae5e5c0db4f7c…

MALICIOUS

PDF

79.9 KB Created: 2021-09-19 07:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1819301f437f7833a8aeebbee0fbf91b SHA-1: e6de313da3eaeed88f89e529924c3796c68596eb SHA-256: cebae5e5c0db4f7c7996757b9b0d414cc90fbcb7f6cfe33e02fb67e3a1936032
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm hosted on multiple compromised WordPress sites, a common technique for phishing and malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous unknown URLs suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.akutrans.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146562b85f49---muwarovu.pdf In PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613259c2c2c11---2778703879.pdfIn PDF document text
    • http://tygodnikzuzlowy.pl/ckfinder/userfiles/files/39393319494.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/85157210857.pdfIn PDF document text
    • https://mashura.co/userfiles/files/fanaz.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/51996702291.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/revagib.pdfIn PDF document text
    • http://otworz-biuro-podrozy.pl/userfiles/file/57755208695.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/97185559228.pdfIn PDF document text
    • https://laznia-radom.pl/userfiles/file/takomigexefuviriki.pdfIn PDF document text
    • http://cosmoscm.com/contents/files/10500840137.pdfIn PDF document text
    • http://oreade-breche.fr/userfiles/file/nixevufovoxopikubudifenat.pdfIn PDF document text
    • http://psystems.gr/Administrator/uploads/userpics/OutPostImages/files/dojibopakato.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16139518453c5b---48685831524.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/saxetu.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/gapijavovomeva.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/93452616494.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/faliv.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/28141499771.pdfIn PDF document text
    • http://friulanamarmi.it/images/file/63311096463.pdfIn PDF document text
    • http://bajkolandia-leszno.pl/userfiles/file/sugiladetekape.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613284f88a3d5---diwoj.pdfIn PDF document text
    • https://ilexgold.com/app/webroot/files/userfiles/files/28515442114.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/gonelopigolupipe.pdfIn PDF document text
    • http://poongdung.com/FileData/ckfinder/files/20210917_C7B7A3123F19EF2F.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+little+things+filme+onlinePDF 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_off0000d511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD511 17540 bytes
SHA-256: 68f37b13b53ba312770db83bc0221902d68db4986989cf741f20dadc235d06de
font_01_sfnt_off0001028a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA1 10364 bytes
SHA-256: 03d49bce7a9b83e76900e4f087567eaaa942c3c8bf604bc6cc86df678da19743