Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d445768abb52ae8…

MALICIOUS

PDF

120.8 KB Created: 2021-07-03 10:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8921c85968b1e080435b30a104237bfd SHA-1: 28da229fd6824ba6e2a95022683671f3fab5b8e4 SHA-256: 6d445768abb52ae81e33e5022661f1f0db7c24df50b208e76fe8983e1c330a2d
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's structure and numerous external links are consistent with a link farm used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://minerva-collection.net/files/files/sufimaxijoroluwanope.pdf In PDF document text
    • http://buergerforum-tirol.at/file/gexopedug.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608f68b456fdf---82502335462.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/zurasaxiwerokemapi.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/wimitiwozamu.pdfIn PDF document text
    • https://sensesgrouphk.com/louis/STARKGROUP/ckfinder/userfiles/files/76278008249.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/d8c569440452efbde41708cbe9e97aee/46602480339.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/cfa43ad31933f72acd08200adef01e4a/97166955941.pdfIn PDF document text
    • http://innotack.com/userfiles/files/8992190601.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/tugojagajotafodapuv.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/16094f76a5fd58---jexelepoga.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1623235684.pdfIn PDF document text
    • https://infoenergie-loire.org/userfiles/file/pasis.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd19f08bd59---biwobilinuxilagapibi.pdfIn PDF document text
    • https://kermoulin.com/userfiles/file/xokudukolotufukotufival.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160924e711efe3---19410732712.pdfIn PDF document text
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/fafbb8bc9c7abb9a150079ac9c3120e6/45537207832.pdfIn PDF document text
    • https://www.frankcapassoandsons.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be697b47303---12659080284.pdfIn PDF document text
    • https://nestsearch.in/admin/uploads/file/28802124647.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607e7ca551932---24479087076.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1607e284b63aa4---22530118324.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=indian+legal+history+book+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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17675 17280 bytes
SHA-256: d5cc749a2de0cf44b640487f4a96928c9586548a404e7819358c9effada3eef3
font_01_sfnt_off0001a31b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A31B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001bb32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BB32 11076 bytes
SHA-256: b7a18a4923f60c3574f3bfc4b88a3def5941c4dbae95aea35b737b007ea739a0

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