Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5792817e5629f6a…

MALICIOUS

PDF

81.8 KB Created: 2021-09-01 08:51:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 03fb714c2435b5fa98de93014c51e477 SHA-1: 6f38e3516f20b64c82d770577a88a85a4728cdbe SHA-256: f5792817e5629f6a3da28b71e0478153638234fae6516006f8ec8c2786e5b28a
156 Risk Score

Malware Insights

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

The PDF contains a large number of links pointing to various websites, many of which are hosted on compromised CMS uploads or disposable domains. This behavior is indicative of a link farm, likely used for SEO manipulation or to host phishing content. The ClamAV detection and ML classifier strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

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://lekkermooi.nl/userfiles/file/lofiwesixomofufax.pdf In PDF document text
    • http://e-pisanie-prac.pl/famprojekt_z_serwera/images/file/nekunemikutigoxibuso.pdfIn PDF document text
    • https://cicadit.ro/UserFiles/file/jogovadip.pdfIn PDF document text
    • https://tyko.pl/userfiles/file/figalugirema.pdfIn PDF document text
    • http://utopiasacramento.org/clients/0/07/071cdeedc048305be324eb10ab8031d4/File/8127482099.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609222f45f900---jabukujurubutuva.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/3407086210.pdfIn PDF document text
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610ae5ac8168e---jijujumivufunu.pdfIn PDF document text
    • http://www.ashtralmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070f36ad8e49---wavuxew.pdfIn PDF document text
    • https://aquafilling.com/userfiles/file/18179115732.pdfIn PDF document text
    • http://ort168.com/upload//ckeditor/files/mukelirivejofun.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/2eue5mghfedei4eof2fkck15n6/49390741371.pdfIn PDF document text
    • https://grupo-kayros.com/userfiles/file/27333790391.pdfIn PDF document text
    • http://www.moyekolodin.com/files/67755742130.pdfIn PDF document text
    • http://demenagements-remond.fr/userfiles/file/20210811020847.pdfIn PDF document text
    • https://grandhotelbulgaria.com/userfiles/file/dovejeliditenibulijoxavu.pdfIn PDF document text
    • http://apcmagon.com/userfiles/30843097460.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/495caf893ee5dcb212f8403df6eae741/47778728702.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe3f90f818---313716119.pdfIn PDF document text
    • http://winterwonderlandzundert.nl/uploadimages/files/32056491973.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d3e59d7dc---totegasarisopuzinon.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/gf2br0c1daduev1gjd3bqkca47/45795405844.pdfIn PDF document text
    • https://www.hed-endo.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160daa4df3ad9a---27534275376.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/3981ac9ba4dab0fad5783cb8848ddf57/fofilofapipenopo.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/gulekakafu.pdfIn PDF document text
    • https://www.loscam.com/lib_common/ckeditor/ckfinder/userfiles/files/vebubofigowedorage.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=build+on+your+land+llcPDF 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_off0000db40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB40 17948 bytes
SHA-256: 5b8d15fd145ea163855689addb4ef61128f5fd49d602ce92faa7325c59024b84
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 10232 bytes
SHA-256: 456ac489b88e840b040094a0e59501375a56bee460ae52f04d2b72a5637f440e
font_02_sfnt_off000120a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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