Malicious PDF — malware analysis report

Static analysis result for SHA-256 d90eb1caf7c1058c…

MALICIOUS

PDF

69.3 KB Created: 2021-09-26 16:58:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 225481108d4bc8f6c9fd9a779c757685 SHA-1: 37885b4af60d705788862c3022421140afe5730e SHA-256: d90eb1caf7c1058caca9f7f6f11309ac5b06bbcd4966d6bd75807c3f7bd75df8
156 Risk Score

Malware Insights

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

The PDF contains a link farm directing users to multiple external URLs, with several hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to phish or redirect users to malicious content. No scripts were extracted, limiting the analysis of direct execution vectors.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://libertyrealestate.in/ckfinder/userfiles/files/wogexexenuvetujuxa.pdf In PDF document text
    • https://washlounge.in/ckfinder/userfiles/files/28021712409.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/delukobenopegoninurinojo.pdfIn PDF document text
    • http://joltiy.ru/uploads/files/24881539762.pdfIn PDF document text
    • https://organicfertilizerproduction.com/d/files/vifoxurutaruvijofoz.pdfIn PDF document text
    • http://galeriejacqueselbaz.com/userfiles/file/82757461783.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/30409132658.pdfIn PDF document text
    • http://www.firstpages.eu/app/webroot/files/userfiles/files/zojivalamonav.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/e382890eb5d30db460d376d2ac7247fc/89598856396.pdfIn PDF document text
    • http://irfanmakina.com/depo/sayfaresim/file/sigorekegafega.pdfIn PDF document text
    • http://viajaconsciente.com/imagenes/userfiles/file/sorelagaguwak.pdfIn PDF document text
    • http://mayepnuocmia.vn/data/ckfinder/files/86506890453.pdfIn PDF document text
    • https://bachson.net/upload/file/danubikewopujizuloxapiw.pdfIn PDF document text
    • http://flemingdecal.com/uploads/assets/file/16849185721.pdfIn PDF document text
    • http://mistral-paints.cz/userfiles/files/21397500939.pdfIn PDF document text
    • http://etpatatietpatata.com/userfiles/files/jajamunurifusoneru.pdfIn PDF document text
    • http://raegcafe.com/uploads/files/53996693538.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/perorupilolas.pdfIn PDF document text
    • http://telekommarketing.com/firme_data/files/kukugupapit.pdfIn PDF document text
    • https://5of7edwardstreet.com/assets/media/files/63876214769.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b71de2b051---mujigatewosa.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16131c7651dd03---63058609857.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137a62ed2a5f---28006707177.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=best+cricket+live+streaming+sitesPDF 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_off0000b204.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB204 10664 bytes
SHA-256: 83edb881068484104ac994d12ba11919524d22220478642bdc75a067b66f4220
font_01_sfnt_off0000ca77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA77 14776 bytes
SHA-256: 8af811cc9f0275277933b56c2eb27aa49ab349565bbc7123138e29d08cdfdd94
font_02_sfnt_off0000ef55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1