Malicious PDF — malware analysis report

Static analysis result for SHA-256 a66c76143f50e6ea…

MALICIOUS

PDF

111.8 KB Created: 2021-07-01 00:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 6cc9db6c3cae404917c43577fc2a7274 SHA-1: c8a571fddab8381562989bd2fb6c66ee84f413c7 SHA-256: a66c76143f50e6ea6c2c287e853770ebaa9e6d0745df0b1976168d902da5a9fe
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories, suggesting it's designed to lead users to malicious content or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://musikpark-live.de/userfiles/file/66303738190.pdf In PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/tatejejasaximojijunexe.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/160783648bafa8---3714321315.pdfIn PDF document text
    • https://xenang-mitsubishi.com/fckupload/file/fawiwasonuwobil.pdfIn PDF document text
    • http://elcampoeco.org/FCKeditor/file/69902078165.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/qte95lvi4seujd6bh2c0u0ksn1/82018108580.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607421efb86db---24658815149.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/41368361553.pdfIn PDF document text
    • https://takeorders.online/wp-content/plugins/super-forms/uploads/php/files/15n0bgkqpa97vfg1i8hctpfmcd/17192165519.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160c6108264e48---sabovowezujer.pdfIn PDF document text
    • http://www.goataxiservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd1a74791---95752048969.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aab65be2202---42786090447.pdfIn PDF document text
    • http://bartuceviri.com/userfiles/file/33559968694.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/d518889a9e9d38b73f0cb803de21e6dc/doxorinenegawaguj.pdfIn PDF document text
    • http://skkouty.cz/ckfinder/userfiles/files/nidute.pdfIn PDF document text
    • http://sdds.be/userfiles/file/21568086575.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/c96f8109cc6ef8a6a13fa4daddedd743/mewowewas.pdfIn PDF document text
    • http://prinsart.ro/uploads/files/64142248252.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3614cf6c6---ramamamusavek.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/44383462583.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/c58fc01179ee90d00447f73d9270c532/magazaxuvubiwexag.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/bopirefizonosir.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/vf8fe763hpd1ej7umns3bqmgi5/jevutatob.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160966eefa3bc3---97301347987.pdfIn PDF document text
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/4aee64f3aa8382adcd0d8e2edf2d04d6/64350045912.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=the+lord+of+the+rings+fellowship+of+the+ring+full+moviePDF 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_off000150b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x150B1 11000 bytes
SHA-256: 528c7fd427196f05e32f98a495ae33f0afbf84eacd7032a3bf8ad7d4e4ecdd84
font_01_sfnt_off000169e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x169E5 18180 bytes
SHA-256: ef210c2c325a44a0d12fff4411531818adffcba8206703fe894edd1f007074bb
font_02_sfnt_off00019908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1