Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fc4ec29ed9ce459…

MALICIOUS

PDF

69.6 KB Created: 2021-10-04 07:54:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4069013a50c0191e1d1246e526fd1161 SHA-1: 2c68f256c1c80634f62433a3837d2ce4330b635a SHA-256: 8fc4ec29ed9ce459ded892549a46ee7eb7fd9f863f32b2b3db43d990696504ef
164 Risk Score

Malware Insights

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

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting vulnerabilities or delivering malicious content. Heuristics indicate it functions as a link farm pointing to compromised WordPress upload storage and disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification confirm its malicious nature, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://fatimaartwork.com/userfiles/file/tufubupipokivajone.pdf In PDF document text
    • http://alnadaoil.com/userfiles/file/ravulanagaf.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/dadopalatajupazuwaguziro.pdfIn PDF document text
    • http://a1-automotivegroup.com/upload/files/kejafiwazumevelanupo.pdfIn PDF document text
    • http://martonelektro.hu/files/file/lumimifudebuj.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/16142d78574da6---29126900815.pdfIn PDF document text
    • https://dermatologie-francophone.com/userfiles/file/jigajibe.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/kimobufiwobem.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/pukiputemote.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/tapuzakikamiwukoraru.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/55922053784.pdfIn PDF document text
    • https://zagi.hr/files/jawusetajex.pdfIn PDF document text
    • http://ukwoodrecycling.com/userfiles/files/didorujixo.pdfIn PDF document text
    • http://elencostruzioni.it/userfiles/files/bexedodu.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/ab4ca067b28928a7608bed5f037fbcb1/tawekawaligomitumo.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/62946436184.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161538a321d828---gigajomejawopusu.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/20594552997.pdfIn PDF document text
    • http://strahovka66.ru/userfiles/file/tumev.pdfIn PDF document text
    • http://druckmaschinenservice.com/uploads/fce/files/nirizagiweroluni.pdfIn PDF document text
    • http://medi-sen.com/files/files/xipakafamanaxanovaka.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/93235570024.pdfIn PDF document text
    • http://rowadhr.com/app/webroot/upload/files/wibomodunif.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/56289780727.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=signs+and+symptoms+of+epilepsyPDF 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_off0000b2b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cac7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAC7 14728 bytes
SHA-256: 78a7490d683345c84de22c6b4d56f208a9b4ed57b0da277c560a6869b2e3b674
font_02_sfnt_off0000ef9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF9F 10928 bytes
SHA-256: 6fb888845ca74d96546885be1f22c40dc3a8e2140e79973de4f63dc284c237e1

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