Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f121664b04c08c5…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 14:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 40c60fc5ab112a6e2b3b07bed051595d SHA-1: ef8329dedee0983c0e685093879c8864d8e7ead3 SHA-256: 8f121664b04c08c5e3c02c8226a72c95d82005f0da213d3b8cbbb780a616293d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 7

  • 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.
  • 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 https://sbmhavacilik.com/userfiles/file/wuguvinobowikoda.pdf In PDF document text
    • http://colorfusion.us/admin/images/file/38071025497.pdfIn PDF document text
    • https://stpetejazz.com/wp-content/plugins/super-forms/uploads/php/files/tq0q7ph489g3ee1s0cmtrkvi1s/wexalo.pdfIn PDF document text
    • https://www.premiumtrade.ro/ckfinder/userfiles/files/93767824282.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/gegonafufefo.pdfIn PDF document text
    • http://yetisirkaucuk.com/firma/files/limodejirige.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/87050041390.pdfIn PDF document text
    • http://madinaboys.com/easydo%20v2.00/files/uploads/47949171574.pdfIn PDF document text
    • http://neo-net.info/giganet/files/file/89695415657.pdfIn PDF document text
    • http://autothudo.vn/upload/fck/file/68904720758.pdfIn PDF document text
    • http://www.mediagrand.hu/data/editorfile/40659187697.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133d344e0c95---41478948186.pdfIn PDF document text
    • https://eguiders.com/uploads/gejobalorugob.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/5740100217.pdfIn PDF document text
    • http://farmina.ru/uploads/files/wizivinewufapuwukejenoki.pdfIn PDF document text
    • http://lecostationery.com/files/file/wetini.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/52780995133.pdfIn PDF document text
    • http://cartopack.com/Images/file/vifetokeloxedexezewege.pdfIn PDF document text
    • http://pyramidplaster.com/file_media/file_image/file/nimenikuwevima.pdfIn PDF document text
    • https://tndvn.com/js/ckfinder/userfiles/files/46346374102.pdfIn PDF document text
    • http://brighterhealthcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/dnkk21i250u5opbrna77gnjrhm/tasidifelawin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=watch+conjuring+3+onlinePDF 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_off0000d748.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD748 10736 bytes
SHA-256: a667edc5c01637ee0cd47b1c2a456f7f9a90676a74a835a2e7f17cccbd82e7f0
font_01_sfnt_off0000eff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010803.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10803 17968 bytes
SHA-256: 06e0e251623d5d30d0b588ac3ed7a5b0cb38ccaea6857d8cd99c864f3d82d759