Malicious PDF — malware analysis report

Static analysis result for SHA-256 239d8c7685315a85…

MALICIOUS

PDF

76.3 KB Created: 2021-09-05 23:03:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 8884e7b056d129d2a0a823ccf2d732f6 SHA-1: 8bd81fafc30b7fd5ba5971ad485cede5b058999d SHA-256: 239d8c7685315a85949b4c125a4d04a588f87fd77a86ab030ae3d2326a5e660c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple PDF files hosted on compromised WordPress sites, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were directly extracted, the structure and embedded URLs are indicative of a phishing lure designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://flooroverstock.com/admin/userfiles/file/dawema.pdf In PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608218c63e010---49155809689.pdfIn PDF document text
    • http://texmet.pl/userimages/file/27798928305.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c53b17345b---78419062502.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/63654958320.pdfIn PDF document text
    • http://szao-spb.ru/images/news/file/6159603712.pdfIn PDF document text
    • https://nabijdefossa.nl/upload/files/wufuso.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9abcdc0---31960085368.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c78bd585b32---zonogofusugojeno.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/xofar.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bec0010dea5---sumisujusobevem.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/27053981174.pdfIn PDF document text
    • http://villa-margherita.biz/userfiles/files/55649167743.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/704ikkg9sq7sj8stb8nag8vfl5/22527507600.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/636f39db917092ec66b3661349b4630e/84394595776.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/u03s8s8g90unc46enm975v36db/19489343671.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-9/20210709091350549941.pdfIn PDF document text
    • http://global-gypsum.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb2b830a574---4415796169.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/c7347246e0a387144ab97f3c1cfe975b/26596461470.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/37367760761.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/gesufululov.pdfIn PDF document text
    • http://raiders71.com/clients/4/41/4134020f2f298c111575624a380fabfc/File/48252965295.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/nikelowura.pdfIn PDF document text
    • http://lucann.com/Upload/file/23176929982.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=building+maintenance+technology+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#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_off0000cb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB5C 11064 bytes
SHA-256: 9d6dbc32626f3f01801db95a13f5708bac637f2f04c74a7dd31436b25913625a
font_01_sfnt_off0000e4c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fcd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD2 17676 bytes
SHA-256: b7ab8de00bee1985157f0d3bc164c78dc03a38833da0dba8e112a669f529ca08

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