Malicious PDF — malware analysis report

Static analysis result for SHA-256 428bbc3c46d4c39a…

MALICIOUS

PDF

79.2 KB Created: 2021-09-05 12:45:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 75127490109ecd2cc0266b32231e6df2 SHA-1: 004edf932b6267e69344b786859d5e93380a7278 SHA-256: 428bbc3c46d4c39a8e9d59dfb89dd0855a9f206a28b2b400894527b8477bcb90
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, with the document likely serving as a lure to external malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://archism.ru/uplcv?utm_term=short+vowel+sounds+worksheets+grade+1 PDF link annotation
    • http://wittlich-luexem.de/userfiles/file/lagakuxasuk.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/56a3329e6d68d2b60b132c6f39e10edb/namekagadanesuja.pdfIn PDF document text
    • http://basaritarim.net/admin/editor_resim/file/kijajezuxesataxozedirujo.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1611261c532bf2---gorodax.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/xifus.pdfIn PDF document text
    • http://matraholding.hu/images/userfiles/files/22101399523.pdfIn PDF document text
    • https://revapackers.com/wp-content/plugins/super-forms/uploads/php/files/llj9n3j9jctl09nlfa7gq04btl/85312570740.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/54789535556.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/purowotiror.pdfIn PDF document text
    • http://ktcz.eu/files/files/famadowiwuvodesiwor.pdfIn PDF document text
    • http://kondicionery-fryazino.ru/upload_picture/file/tuvipaxulo.pdfIn PDF document text
    • https://gpagroup.in/wp-content/plugins/formcraft/file-upload/server/content/files/160fbb13e1df91---ragavefenoxedevepov.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/80b551cb5879184c10d018093f45bab4/84846451283.pdfIn PDF document text
    • https://www.kiteschule-eckernfoerde.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ee69424f6ee---23805987216.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/73428588192.pdfIn PDF document text
    • http://conelser.hu/fck_uploads/file/88747118047.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/dikepiwimosi.pdfIn PDF document text
    • http://flagrant-desir.com/userfiles/file/70120179270.pdfIn PDF document text
    • http://gamjagolla.com/uploads/files/wipodulef.pdfIn PDF document text
    • http://ssatripoli.org/userfiles/file/56428194869.pdfIn PDF document text
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612195804a8a7---binejemo.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/9510370198.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966564ac0a6---totalodejavajasu.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_off0000ce91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE91 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e6a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A8 10904 bytes
SHA-256: e36354f8a8556db75f5cd3c2ba95e20dd49abf5109cdff4948e5bb08c212b57a
font_02_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 18408 bytes
SHA-256: 6a371e82ad3c11000ff207dcfae96f55ece78e91738500851c17a59cba56a3b6

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