Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5c38712dedc017…

MALICIOUS

PDF

73.9 KB Created: 2021-10-02 22:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 32b318a0a467f4c5f7d75006002f6178 SHA-1: 27c5e30577bd62999f82a3dfe0d1b07516f13f77 SHA-256: 5f5c38712dedc017181d3c4a46c8cf93ede63ddc7777dd9f2513d319ac01ad83
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure, but the presence of multiple distinct hosts and the nature of the links strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9914

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://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0919e0ad5---livakabeworejewutuxigo.pdf In PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16144dfaf8e28a---nigizubenatejenalumuxo.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/32920140631.pdfIn PDF document text
    • http://www.moyekolodin.com/files/maluxewi.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/nh6ji4rsjcv7emakjqma2pjqcu/kerisujezutewedanipekesuz.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/nerasusin.pdfIn PDF document text
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613c19f6bdb15---xemoja.pdfIn PDF document text
    • http://bangladeshceramicsociety.com/uploads/editor/files/62945481581.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210922161339.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613702436d2e7---naxusojakisulize.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/savej.pdfIn PDF document text
    • http://najlepsietorty.sk/uploads/fck/file/45756489823.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/92904281025.pdfIn PDF document text
    • http://svb-volleyball.de/userfiles/file/9763661912.pdfIn PDF document text
    • http://www.wallisandemmanuel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ead3423536---82557421784.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/kufejurozilebag.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/didijogajo.pdfIn PDF document text
    • http://herningbadintra.dk/app/webroot/upload/files/janone.pdfIn PDF document text
    • https://posh.hr/files/37927473333.pdfIn PDF document text
    • http://antichigelsi.it/userfiles/files/maduvubezawediwafopowi.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/95723083163.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161310990130ed---sovusozani.pdfIn PDF document text
    • http://parkety-patemal.sk/files/file/benavi.pdfIn PDF document text
    • http://appinaris.net/ckfinder/userfiles/publics/files/filajifuvigotolivukol.pdfIn PDF document text
    • http://erkerlaender.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614ec2f78dd26---pasevizewa.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/wegopezububagidug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=ielts+speaking+topics+with+answers+part+1PDF 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_off0000b8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8AF 10832 bytes
SHA-256: 427d7f8e0a995c2952ed720e9dc51cff5cd266cb5af6a30a0097bf1def51cbd2
font_01_sfnt_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 18484 bytes
SHA-256: 55cb8e0af8f3c6964f2402355b18a6c4aabe9634fc43487de9bc2e60d35831be
font_02_sfnt_off0001017d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1017D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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