Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec86b230be78a2d8…

MALICIOUS

PDF

91.9 KB Created: 2021-08-07 17:08:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: e1fcb85e0edc62e8a22b27154c2d0a7d SHA-1: 7d5ef82bb51672fe2c952e131e446ad775f78a72 SHA-256: ec86b230be78a2d8622ef691a3c582b7fa1c87a28f5c2ee9293caaa1317899b4
236 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing and trojan threat. The document employs social engineering by luring the user to install a browser extension or update, likely to facilitate credential theft or malware installation. It also contains numerous links to potentially compromised WordPress sites and disposable hosting, suggesting a link farm used for SEO poisoning or redirecting users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/57dfb68fa7dd6d523c06d009b51d8d46/11366292408.pdf In PDF document text
    • https://aulacvn.com/upload/fck/file/bategemozuron.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/nonavireduvoxinavu.pdfIn PDF document text
    • https://ev-owners.jp/userfiles//files/25311736858.pdfIn PDF document text
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a9e198e77de---jixuzafesowamisovow.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/1607f40dd2df0f---13171598428.pdfIn PDF document text
    • http://www.conectadoscomdeus.tv/arquivos/file/luzomuzasulojukogele.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/2cb5e99a66afd913fe1889540a04566a/vijuvo.pdfIn PDF document text
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/9b86bea7d70657457b9c71d064d32288/piwenojipubidatobav.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/76d2970228ab41827fe502be175aead9/4927585274.pdfIn PDF document text
    • https://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/a23tedrkuf647bkotj9766gdqr/muponeb.pdfIn PDF document text
    • http://elitaliaweb.it/upload/file/bikazudobepalufazunado.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/19438379596.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/16089055607dd7---39907390091.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1838d944c---28993535375.pdfIn PDF document text
    • http://20thhelicoptersquadronreunion.com/clients/71358/File/giwevexolinuki.pdfIn PDF document text
    • http://nuocmambason.com/upload/fckimagesfile/477225c313bbe27a31b472b631ac67ed.pdfIn PDF document text
    • http://inwallendorf.de/userfiles/file/46419615924.pdfIn PDF document text
    • https://www.hkfew.org.hk/ckfinder/userfiles/files/joxojodupunimojajumenujiz.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/b7d52d30a828296efce0e7b033310211/mafufasuwufebukegajid.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/48662284351.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/4400850696.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=how+to+install+whatsapp+in+bluestacks+manuallyPDF 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_off0000fdfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDFC 11064 bytes
SHA-256: f9628a12d083b7388439f3c79fedc4a5716a28ac2e534aa8f5e3fb9629637682
font_01_sfnt_off00011762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11762 19392 bytes
SHA-256: 442408c9702aec3129fce5e5bba732e0d9a97dd5b6750741d46de76e25832891
font_02_sfnt_off000148cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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