Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f5a9827634d25f…

MALICIOUS

PDF

95.4 KB Created: 2021-09-22 10:37:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ebe1dfdb5d49e1af22e80e8a73eec7d5 SHA-1: c67030a3f32ff374735081ce401269f0190090fb SHA-256: e8f5a9827634d25f18c3f23e1caf86a7d44f055806f7911babaa40ef69a71b9a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to phishing or malware distribution sites. The file's structure and URL patterns suggest it's part of a phishing campaign, hence the Spearphishing Attachment technique.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135ac8d81225---72809009557.pdf In PDF document text
    • http://iseveranscopy.com/upload/editor/file/mifafix.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/161401a7cb65b9---juzemubudunofikonufesozeg.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/4327832790.pdfIn PDF document text
    • http://edituj.cz/res/file/wubijowiguzebadojisam.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/25385347089.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/fonoxudagofidemotoxatuk.pdfIn PDF document text
    • https://alhurwallpaper.com/Files/files/xamefuzibefusiluji.pdfIn PDF document text
    • https://madeinstlucia.com/userfiles/files/basemamojotuxeloko.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/nesimixer.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/50483432050.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/debovonenagewawofubexowul.pdfIn PDF document text
    • http://helloslow.com/data/userfiles/files/sinuj.pdfIn PDF document text
    • http://cerritos.songhakbbq.com/uploads/files/57518284004.pdfIn PDF document text
    • http://ourdesign.hk/ckfinder/userfiles/files/52576269527.pdfIn PDF document text
    • http://rovitek.com/userfiles/file/dureja.pdfIn PDF document text
    • https://chanty.dacola.com/upload/files/zetaza.pdfIn PDF document text
    • http://girc.ncue.edu.tw/ckfinder/ckfiles/files/44844223483.pdfIn PDF document text
    • https://infrapanel-alegjobbfutes.hu/userfiles/file/36907005291.pdfIn PDF document text
    • http://sxnqx.org/upload/file/Fl202109030508113751.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/c385e2dbcedabf9c41d4a8e3d732cad6/58715531952.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/safapaxisov.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/bebivokafogogepan.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/vedivetetuj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=android+socket+examplePDF 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_off00011194.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11194 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000129a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129A6 17500 bytes
SHA-256: d281129f21bb153b7ad0d89d82966fd2dc30f3d9cfae756844d1894d474f2595
font_02_sfnt_off00015728.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15728 10852 bytes
SHA-256: bbe53684bc68d6388e978425c97c86ec184c863dc1a9927b69088f722abef389

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