Malicious PDF — malware analysis report

Static analysis result for SHA-256 04c99784273189bc…

MALICIOUS

PDF

79.9 KB Created: 2021-09-05 01:26:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 2c92ba144afba33e3d6e03281259346c SHA-1: 04588290324f58600b57a0ed88b1ed3b1c9bcb71 SHA-256: 04c99784273189bcfb1953c8fffad23e15d214762bca99d950ad977a5d5a6479
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified it as a link farm, with many URLs pointing to compromised WordPress sites and disposable hosting. These links likely lead to phishing pages or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098419ade4bb---memomiwusuzik.pdf In PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfe893260a7---54251032890.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/a6c9a57bbda99cd69297a081ed291151/paniforox.pdfIn PDF document text
    • http://rdasesores.gestconcursal.com/editor/ckfinder/userfiles/files/90519423243.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/resogulotivupo.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/e91d7c1430edea44490a7cdbe0a74966/dunanefajupuvafum.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/m9pc8572gtn506h7e4v51at067/67081239355.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/25746584847.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/d20a07e14ece1bbaa78b23072245196c/35697531999.pdfIn PDF document text
    • http://vinhhangvien.com/upload/files/sezulas.pdfIn PDF document text
    • https://xn--faades-mtal-n9a6a.ch/ckfinder/userfiles/files/55138781097.pdfIn PDF document text
    • http://boursemoi.com/userfiles/file/kovavixawuvogixobuzofojiz.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/53c308bb18793a9339330e5e8ef29c24/84031616285.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3d6a8aca1a---66241441824.pdfIn PDF document text
    • https://bataretak.com/img/files/file/tofufupudetukiresitupes.pdfIn PDF document text
    • http://ferrogep99.hu/static/media/file/rajajolamuwizotozo.pdfIn PDF document text
    • https://nadinerogger.ch/userfiles/files/sewowajoga.pdfIn PDF document text
    • http://www.masozilina.sk/ckfinder/userfiles/files/9357717981.pdfIn PDF document text
    • https://mediaskills.rs/files/gefufirewinireluxazubisuj.pdfIn PDF document text
    • http://zetrade.cz/userfiles/file/mujarojazolopadexijodit.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/34076808058.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=terapi+hordeolum+eksterna+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_off0000d3fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC11 10916 bytes
SHA-256: 9fb85c234a88908c2e94a6904f3e6675d43743abcfe12af3be54e434160a2574
font_02_sfnt_off00010523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10523 17544 bytes
SHA-256: 44a074aca054581dcbfe2e1d55a9d075f861b2fbe11ccde2777977c58c58c2b1

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