Malicious PDF — malware analysis report

Static analysis result for SHA-256 a47fa4ded0c3a468…

MALICIOUS

PDF

78.4 KB Created: 2021-09-07 18:18:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 137f6c1d8c0a9f87d9f8c7a6b6fbbd1d SHA-1: dfadfa739116bbdfe8242cf3fd2cf3fabb4751e4 SHA-256: a47fa4ded0c3a46838257fe0dc2907fa3b1ad6b57b249a0da4df9775b80b2040
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file with embedded JavaScript, which is a common technique for executing malicious code. The presence of a link farm pointing to compromised WordPress upload storage and other disposable hosting suggests an attempt to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://alyansdugunsalonu.com/userfiles/files/78993463728.pdf In PDF document text
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/mv328stj8hn89il3vuc9f5lpd3/ruretazekigafabegos.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/52707460543.pdfIn PDF document text
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/k3l86mv2pcgiel4qn13l8q0qe3/fokitin.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609840abe20f4---38901158361.pdfIn PDF document text
    • http://1137.jp/app/webroot/js/ckfinder/userfiles/files/33661227043.pdfIn PDF document text
    • http://kubabus.cz/novy-web/upload/file/wobuw.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202106120422113531.pdfIn PDF document text
    • http://innotec-industrie.be/userfiles/file/66608014193.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3dd52bfb9---tilesudediwidowu.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/71af0ad422e25c7107c790d9d04f7f8b/mozenekigumanuf.pdfIn PDF document text
    • http://interstroy96.ru/uploads/files/gavawekuraveligimomebepa.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/jojexejoguvozadededifub.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16095c8ac1c57d---foxavatapikafe.pdfIn PDF document text
    • http://lisahyatthealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/160abf518c8d7b---genalizewi.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070b8d281cab---34327684430.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/d16fd90a6c22ecc624ae8f1706c9acde/67611721813.pdfIn PDF document text
    • http://www.advokat.com/app/webroot/img/fck/file/5862760827.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cc4fedc940---91344445307.pdfIn PDF document text
    • https://mk-sito.it/uploads/file/57740648903.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/68733222542.pdfIn PDF document text
    • https://israelonthehouse.com/wp-content/plugins/formcraft/file-upload/server/content/files/16100a19da172a---pepujiwer.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=science+worksheets+for+grade+3+pdfPDF 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_off0000cfe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE1 11280 bytes
SHA-256: cc1d155826f94e2ef1af7f67ed9ec92f0a9a41c5e2a16fa4090b2f31610d069b
font_01_sfnt_off0000ea33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA33 16272 bytes
SHA-256: f241fe4808bad66480efe4e1acbf6f11abff1150ce1e4c27613ec6fa35a82882
font_02_sfnt_off00011405.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11405 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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