Malicious PDF — malware analysis report

Static analysis result for SHA-256 a71f49597ce2d4f7…

MALICIOUS

PDF

96.6 KB Created: 2021-06-27 23:28:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 1c299f108c8031d37e9b3bc758a21b62 SHA-1: 30c444466c06f903228c783d4a2a20702cb2461c SHA-256: a71f49597ce2d4f7d8bd8a982667064363b117c7bfbec41095a96a1e41d0c090
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the presence of numerous external URIs and the overall heuristic profile indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://huntic.ru/uplcv?utm_term=list+of+ground+nuts PDF link annotation
    • https://svetpoznaniyaonline.ru/wp-content/plugins/super-forms/uploads/php/files/e298ccef93e802db8e716d26267ae44a/gafutotolojamed.pdfIn PDF document text
    • https://teenvolunteerdallas.org/wp-content/plugins/super-forms/uploads/php/files/beb76cf2d31e0b8181b8c226e0915fa2/47097976769.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/53398589835.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/dae84aaadba212d5d9a7e664a07db089/vakavunoge.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a85df7c6541---57022152843.pdfIn PDF document text
    • https://www.jscorporation.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/1609809332f8b5---muguxagefuwejab.pdfIn PDF document text
    • https://ambientltg.com/wp-content/plugins/super-forms/uploads/php/files/449cb1ba3630536b80945d525a6459f1/tebimu.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/b6ff0374370ba16315edba91b120b709/32968205231.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/153de3bf5b6763fe174a064586d1c8ae/dajizogafaje.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/t35aln6a74rdddm26pnc76j2nc/12253408344.pdfIn PDF document text
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/ab5d7471013b0cc5424c724c29c55580/7926037840.pdfIn PDF document text
    • http://csim.jp/ckeditor/uploads/files/durumovubesusogivi.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/vonanutujasabizomune.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/e564aeb8e36a6b6512e3fed7425ea9dd/sawonavogivener.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/6iaetnnt19uvfuvuabg4vogfq7/vefijesomitufujexelu.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/pawevizuxulami.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1608088d7c4614---25044559282.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/1dlbhmpqrupngqjej94r3mrup8/jifubofotonakijuvejifap.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a21112c60ee---walekurakubozekefori.pdfIn PDF document text
    • http://aiskreunion.com/clients/b/b4/b417c2091670ce0b0d78f4b231aea02c/File/vafuleririz.pdfIn PDF document text
    • https://law.myvzl.com/wp-content/plugins/super-forms/uploads/php/files/sj1jll7fehf9c8445ctt6nc5um/jasimon.pdfIn PDF document text
    • 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_off00011b1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013332.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13332 10244 bytes
SHA-256: d4d3a5c227ea10cd58b04738129539aa102cdb2e87f8849c59b957ac28e211e4
font_02_sfnt_off00014a1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A1D 16824 bytes
SHA-256: e7697ff2e1f0d174b8954f62726e051a4b297b5078c3823d154b203a61b86119

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