Malicious PDF — malware analysis report

Static analysis result for SHA-256 b58f1acb8a40ae4f…

MALICIOUS

PDF

101.6 KB Created: 2021-06-18 03:53:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: db562753c8329278ce3060b0fbc93be5 SHA-1: 9438b406bd6634172928f080e8b595ff47e09ef1 SHA-256: b58f1acb8a40ae4f2f6b4efd368143d4fe182921bce24a70c05c967cf0afc12a
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's used to distribute further malicious content or phish users. The document body, though heavily obfuscated, contains references to 'Fairy tail dub free' and authoring application details, which are likely lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://fceresources.com/ckfinder/userfiles/files/sabejuso.pdf In PDF document text
    • https://igruppe.no/ckfinder/userfiles//files/roxazed.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/45a09c59905a9984a6a9b1fce12e3920/tusesetetalimajuzerejixa.pdfIn PDF document text
    • http://www.patricktennis.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160be31d3b2f87---89439712476.pdfIn PDF document text
    • https://postscriptproductions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a419bc8e368---14730810639.pdfIn PDF document text
    • http://pinzimoniofiumicino.eu/userfiles/files/vawotugipomarajaza.pdfIn PDF document text
    • http://www.alfainstal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1609de9ed0d223---nafine.pdfIn PDF document text
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607baaf43555b---dosajejelanikofinedijade.pdfIn PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607816387b24e---44557826908.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/4a42ab505cfb2e870babcdac800cebfa/binasi.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a833d88d06f---goxaduw.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079a74479613---megawufukixun.pdfIn PDF document text
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608c21e79bec0---dukobevutaru.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa6653b7d2e---medenajokorakolazofo.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/f6jpjgi8ra09n1ddg9ef4jlv9l/wumefogejibupukoke.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6eceb450---91761976496.pdfIn PDF document text
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/bd00a3ca19a4f72c99bc49f1697bde6f/nedimobavabebovebifo.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/68791892529.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fairy+tail+dub+freePDF 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 16024 bytes
SHA-256: b32f3cd6b93a35ff3b42be4afb0e63949712614e4fc5076527bfd86cab3ccb28
font_01_sfnt_off000139e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x139E8 4920 bytes
SHA-256: 9415f0832b05f909894dced8033ca1132fb77bd18d03602653fdcc477c50c5c9
font_02_sfnt_off00014aba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14ABA 12172 bytes
SHA-256: 6d2526b917e819fca8caabb4e56e3637d721f3f80ac4ffcb404948854798ef77
font_03_sfnt_off00017320.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17320 16148 bytes
SHA-256: 804829d1b1917b71a3ae35ba7b0c6f4a498771687878f410d88f17bcb7612d38

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