Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a4c772c40abd7a1…

MALICIOUS

PDF

87.5 KB Created: 2021-09-08 00:48:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fc9fe5594595cec5b0f255db851b95f1 SHA-1: 31936821127b80c75cc182f5a863458e569d275e SHA-256: 8a4c772c40abd7a12896fc02f764deb9732ce07030aa4f1ff25d2bc97065931e
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and link farms indicates an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16086e74c50c28---1983782292.pdf In PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/sakotiro.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744a2e181f4---leloserativej.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609b2ebb344df---63572070479.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-4-30/20210430235252209008.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16078a98412b61---fawutabujevegefega.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/504431f5f4e21be788bcce517c72f158/87003049031.pdfIn PDF document text
    • http://ksnjl.com/userfiles/files/49885223143.pdfIn PDF document text
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/7a797a7fcb4e453264823206de033b18/38220836601.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2f79c0adf---76579472506.pdfIn PDF document text
    • https://thisissati.com/userfiles/files/jamaribosoxetem.pdfIn PDF document text
    • http://messtores.ca/fck_user_files/file/jatalawusevawedukeziwotu.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/52455b5f06baa394ccd43cf9f31a0402/13518417191.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///95422191972.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9b6884a9f---jinerukimogisofarawege.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/58032c1d419c7e030ddf27bfb186b08d/xixarewogafawaworuve.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/27120822719.pdfIn PDF document text
    • http://danburyhighclassof1961.com/clients/b/b4/b42d7d7907ff1a67dd6fd366dd3c6775/File/darodiguz.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/sivfecvg82c8u44ecdpc4fe3p4/fajiletuvojoxikasisaja.pdfIn PDF document text
    • https://ancoraeducacion.com/images/tuziregizibidesexobiz.pdfIn PDF document text
    • https://gemwares.com/userfiles/file/25833699986.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/zazusemaxeduvinopika.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0038c98a955df85f15c025a89164722f/57061719315.pdfIn PDF document text
    • https://obermeyer-modemarkt.de/upload/file/matupopilawedanave.pdfIn PDF document text
    • http://guides2alpes.fr/uploads/file/memoweraxix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=obedience+to+authority+stanley+milgram+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_off0000eb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 11448 bytes
SHA-256: 167950231e6ceaad0861bd89cb197b245218a64f1b2519bcf25df636ff168f9b
font_01_sfnt_off0001060c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1060C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1E 18820 bytes
SHA-256: 74a9190fb60f73fbb5a8faf05aba1b99cdcdf03db751ba73f8c687359ea79499

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