Malicious PDF — malware analysis report

Static analysis result for SHA-256 e79d8eff6a133897…

MALICIOUS

PDF

82.4 KB Created: 2021-09-18 18:47:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3bd17548488bcf26c0db9a20576fe90c SHA-1: 775adf8e7da1144c142f6af971a282ef13a4d5e9 SHA-256: e79d8eff6a13389796be3b52e353439afab3cf1e2945a1a9d11083cdd9ce7d0a
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, so the rationale is based on the URL analysis and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://corpus.bg/files/fck/file/36054018498.pdf In PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/58lfklvme2bo6pkmd7jgds7uv4/dijitipamebalepebeguzuk.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140c93e004a8---vipivatiga.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/02de1276130b6f87d9b4da3a128b33b4/33654998325.pdfIn PDF document text
    • http://pmrs.ps/userfiles/file/vofojuvotimimezenede.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/xabepokisebamupojenaw.pdfIn PDF document text
    • https://xuanhongkhang.com/upload/files/99286456243.pdfIn PDF document text
    • http://watch62.ru/files/files/63738904758.pdfIn PDF document text
    • http://agriturismolionsfarm.it/userfiles/files/wigawepudoselazesedowi.pdfIn PDF document text
    • http://caytrong.vn/Images_upload/files/xozodufajewupegabutubepu.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/59130576421.pdfIn PDF document text
    • https://vientangluc.com/upload/files/malujerumi.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1631937400.pdfIn PDF document text
    • http://creativeindustries.ru/uploads/userfiles/file/79694435340.pdfIn PDF document text
    • http://inteko-tula.ru/f/file/mitexerovirod.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/tefitefegafadesasikude.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/dopevegesakatokovi.pdfIn PDF document text
    • http://kiajihlava.cz/UserFiles/File/ponebip.pdfIn PDF document text
    • http://aotwcasino.com/ckfinder/userfiles/files/40353924865.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/3207608721.pdfIn PDF document text
    • https://artbynela.com/uploads/file/20213264562.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/81016036764.pdfIn PDF document text
    • http://facyt.com.ar/ckfinder/userfiles/files/70605012335.pdfIn PDF document text
    • http://krupongs.com/images/file/40690878588.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=12th+maths+1+textbook+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_off0000dd27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD27 17708 bytes
SHA-256: 25f123d6e6cf6fdd92f94d6c9f75eefeec4189a8da229b3d44fe52b66011623c
font_01_sfnt_off00010b1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B1A 10828 bytes
SHA-256: 2d63a3b186da6e192260407674932924148617f5e8892f1447391239aaf9a59d
font_02_sfnt_off000123fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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