Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c2ec716a39fb713…

MALICIOUS

PDF

83.5 KB Created: 2021-09-10 05:03:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 42bfca77569d8739774afb61ae2c254f SHA-1: d4f43c1e03f1b88010c9517bd38a4b55cc24d342 SHA-256: 3c2ec716a39fb71342ebf679718efea160683756e6cea59dde26dc64e77e2f46
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The 'SE_BROWSER_INSTALL_LURE' heuristic suggests the document attempts social engineering to prompt the user to install a browser extension or update. Embedded JavaScript streams and numerous external URIs, many hosted on compromised or disposable domains, further support a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://longbeach.ilovepokebar.com/uploads/files/kasofulegutat.pdf In PDF document text
    • https://djennebeads.com/nbloom/fckuploads/file/jadanajakufesilej.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/83983677858.pdfIn PDF document text
    • http://smlstripedbass.com/home/rock/public_html/ckfinder/userfiles/files/40498739085.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130f897e2c9d---limunevalofebu.pdfIn PDF document text
    • https://rh4-h1tapi-turbo.com/contents/files/6116289835.pdfIn PDF document text
    • https://castilloexterior.org/ckfinder/userfiles/files/80066318225.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/68891598345.pdfIn PDF document text
    • http://maquinandoysubastando.com/dleyes/admin/fotos/file/vabitozu.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/766148538.pdfIn PDF document text
    • https://vico-real-estate.com/ckfinder/userfiles/files/buxujotudigolokim.pdfIn PDF document text
    • https://mpressivelabels.com.au/application/third_party/ckfinder/userfiles/files/nagigagabigutazufopiloniw.pdfIn PDF document text
    • https://lotusmarinevn.com/upload/files/2690880655.pdfIn PDF document text
    • http://ekhoron21.mn/uploads/files/molekokan.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/8880660562.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612eece88206d---99161892317.pdfIn PDF document text
    • http://alpha-th.com/userfiles/file/77058102513.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613272c32c046---17254826968.pdfIn PDF document text
    • http://lawyergz.net/uploadfile/files/bufigulafetipex.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/36360924225.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/xuzokopipovumewoxipusa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=file+explorer+android+2.3PDF link annotation
    • https://grupo.iberia.com/js/ckfinder/userfiles/files/51022619392.pdfIn PDF document text
    • 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_off0000dfb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFB5 10556 bytes
SHA-256: d75c446a7d220af6d46b33945553dc8e3af682eef443ca18d893ee03bb548849
font_01_sfnt_off0000f7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEE 18784 bytes
SHA-256: 33401644006b001c03ae490af63119debafb5aed6fa11a876099d73183add350

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