Malicious PDF — malware analysis report

Static analysis result for SHA-256 c59067ec9163eaf6…

MALICIOUS

PDF

77.0 KB Created: 2021-09-12 21:20:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 01c5f0735c4a63c06a50326f500ecce0 SHA-1: 138b5da9b198b68d9ce8c0eea4b58e53f2622dbc SHA-256: c59067ec9163eaf6c8b0ff5c1a1af663f5539c47f12391aa12c192c17d46f330
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains a link farm pointing to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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 http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/relozagivibeve.pdf In PDF document text
    • https://fiscalonline.ro/app/webroot/files/userfiles/files/20020012241.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316569060e0---guredofafe.pdfIn PDF document text
    • http://www.buildonhope.org/file/5594791529.pdfIn PDF document text
    • http://duoctruongxuan.vn/userfiles/image/file/xeditekonobuguxakexa.pdfIn PDF document text
    • http://thienthaopc.com/upload/FCK/file/ritelowuneroluwe.pdfIn PDF document text
    • http://a-b-i-s.net/layout/bilder/file/vexesewegawonoke.pdfIn PDF document text
    • http://devison-matras.com/upload/file/79323210437.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16136c44610e94---22263081831.pdfIn PDF document text
    • http://retailpark.bg/uploads/wysiwyg/files/56675035779.pdfIn PDF document text
    • https://whiteplacard.com/UserFiles/file/92345734152.pdfIn PDF document text
    • http://foxgraphics.paulsfashion.in/files/61690317730.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202195951202478.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/34818733949.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/mufak.pdfIn PDF document text
    • http://mopron.ru/upload/files/43434955141.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/hpd07m1nctv45k0qlj3utjjbla/29279277862.pdfIn PDF document text
    • https://hyundainhapkhau.vn/upload/files/65934566549.pdfIn PDF document text
    • https://www.mftelhas.com.br/adm/Editor/ckfinder/userfiles/files/21610047032.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/16136cce4b7676---46683881241.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/duruzakabofow.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137dd47e9aac---15086439492.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d512f18bbc---sawafejarokaserisuvo.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/ziserox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=snaptube+video+music+downloaderPDF 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_off0000c7e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7E7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dff9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF9 17424 bytes
SHA-256: aa25196908fc7982a258445e0d2db37d8fac4bbd77547d51b40d589dbd459572
font_02_sfnt_off00010cd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CD6 11144 bytes
SHA-256: 350f3508ca3a1205236d656e2fac58210380cdad56d6d54510ecb00bf6357276

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