Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8e43f5e3c30f7c…

MALICIOUS

PDF

83.5 KB Created: 2021-09-04 20:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 47ecbe894cd8a5d4018a0be87dda74dd SHA-1: d35210a37e9a4d89f3e88169f4dba373f259a8a3 SHA-256: 2f8e43f5e3c30f7cdb994fad9e91efc25be31e92005c8ab40f765bb285bcf2b1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. It contains a link farm with numerous URLs hosted on compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded URLs and the nature of the heuristics strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16102d40f9902b---tegabesexerubanegivapew.pdf In PDF document text
    • http://allaboutdowney.com/userimages/1296755794.pdfIn PDF document text
    • http://giayviettri.com/img-ftec/files/risawureju.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/dazotenesanenomiximefavur.pdfIn PDF document text
    • https://transcendenceit.com/wp-content/plugins/super-forms/uploads/php/files/95bf6e4b673d8641c1b87cab6075b264/sikovosekurokefesuf.pdfIn PDF document text
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922eebbba41---23275204371.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/9564174aaec15b1ad50e09850a860982/worizelusemoxesesuvux.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607690a7afe44---59761972808.pdfIn PDF document text
    • http://turexpert.md/userfiles/images/file/3181085693.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/75499f51a0d7bbf5826f3fdc7326539d/93633930169.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/6q10adgp6r94pmll5bvc4hb2f1/85296880472.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/47269417312.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abdf22aa506---40757157408.pdfIn PDF document text
    • http://assotechne.eu/userfiles/files/54865018139.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/86253091550.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16082559f40df4---98937295080.pdfIn PDF document text
    • http://cityclick.it/userfiles/files/76351456905.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4f655a00c---393585109.pdfIn PDF document text
    • https://rajakedua.com/contents//files/10574102405.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fd082610eb---maxetumowifajofekitabo.pdfIn PDF document text
    • http://gwtcs.org/Content/uploads/files/52479921603.pdfIn PDF document text
    • http://anvlaw.com/userfiles/file/34881991044.pdfIn PDF document text
    • https://eccdc.org/application/webroot/userfiles/file/wanufivabilidoken.pdfIn PDF document text
    • https://ovalpolycoats.com/media/biresexulutatipare.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/12107914881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=upsc+agriculture+optional+question+paper+2016+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_off0000e1a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A4 11508 bytes
SHA-256: 3dd12628b532b711b7c2bbd6678da59ae386ba33b015f2874f049d91cfea0fa6
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 16932 bytes
SHA-256: 2fc7bd5ce1043917143852cac9a36d8ebd2d247a5deb75943ea574850e0cb097

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