Malicious PDF — malware analysis report

Static analysis result for SHA-256 a33ce26f5c53fc51…

MALICIOUS

PDF

98.0 KB Created: 2021-05-03 13:26:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: f4c376b40b76b80ed60a476c980974b3 SHA-1: 7d8c504ae81761ddbe1818b12033654dd0f32ff0 SHA-256: a33ce26f5c53fc516e90bf479bc92ba67f66ea053a40d156aa9afc4051d2cd6a
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised CMS upload directories, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The presence of multiple distinct hosts and the use of 'utm_term' parameters in some URLs further support the link farm and potential phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cc0acce88f---52686813552.pdf In PDF document text
    • https://amalighting.com/wp-content/plugins/super-forms/uploads/php/files/ccce6aeab6a79ffe4af1104a5e64e047/kobisipuzusazanazudu.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079b15c6d63a---92407546752.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/54135ece8cb468dbaf95206c546ebbb8/guwod.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160824116c006a---ponamutusajupiwovoburokof.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/dowedokadun.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16087ed0d30a6c---51060572232.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/166f92f8d863e8ca4d78a378f2f3928e/gaxosewabeleluvowu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/7a68b7b715e7e6be8bceb6162cc8c4d6/repideragipitizedavodobir.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/98969767297.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/tqptc5lhm9onoa0au3qi67qvb9/92393359862.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f2d74045fc---mezinawetuniriwatuje.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/cebf2bd55c27074d90b13700db8f745e/difokowejorabevori.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/9mnckf0js91o49sinv93d6s710/91482323241.pdfIn PDF document text
    • https://www.harasportcenter.com/wp-content/plugins/super-forms/uploads/php/files/cg6p8mr9n2ooja7ucec7u9gifl/24692457524.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=backbeat+fit+500+manualPDF 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://scripts.sil.org/OFLIn PDF document text
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E16 3220 bytes
SHA-256: 6b86e638161a3fbfecdc358bbeae220209607f82105e05ceb28e29578f2244d1
font_01_sfnt_off000119b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B3 5272 bytes
SHA-256: bb2bc14b38b293b14d0c1051dfd3762754847cfc9c503646cd4a5429476fd5f1
font_02_sfnt_off00012b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9A 6192 bytes
SHA-256: b9392e50b3a5cbdfed0141ab96cab5e1950d7fe119fde2a28e2ec7ebd640ed25
font_03_sfnt_off00013bb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB0 12668 bytes
SHA-256: 19780462d4f5dda0fc5038da271d1e8aa122260a4e64a5bc37d990388cc4f34a
font_04_sfnt_off00016519.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16519 16108 bytes
SHA-256: 40b4972c50c88d393489be5bde3d81a1619b37e5b87fab5a2fbd656868057354

Open this report in the interactive analyzer, or submit your own file for analysis.