Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbd18ef4c72ebb99…

MALICIOUS

PDF

79.9 KB Created: 2021-09-09 14:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f2d8468495708fcf502e2bb778580626 SHA-1: 52fe087c167b0721fb66d564a686faea74091477 SHA-256: fbd18ef4c72ebb999d50d0c48ebf35e7f7c923a1ede92fd12d57ed14cf6d348c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to multiple disposable hosting sites, with one URL specifically identified as a compromised CMS upload. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload. No scripts were extracted, but the structure suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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 http://hoteldanang.vn/uploads/images/files/jugupamazapovu.pdf In PDF document text
    • http://ls12368.com/userfiles/file/fegatugisigelagizerovesej.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/606ffd6544cbba1a2581927ac96e9062/lipewekijidaxevolunej.pdfIn PDF document text
    • http://dansungsala.com/uploads/files/filifudanokotijup.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613753576e795---rikizekaxinenamosenewutoj.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/5222442188.pdfIn PDF document text
    • https://led7.ru/file/43837588780.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ab0c2d001---6988951236.pdfIn PDF document text
    • http://magooferta.pl/uploads/fck/file/senefawijuke.pdfIn PDF document text
    • http://dierenwinkelindex.nl/images/uploads/90541772014.pdfIn PDF document text
    • https://clearpatth.com/userfiles/file/69198175669.pdfIn PDF document text
    • http://visusmarble.com/images_upload/files/fuxukuj.pdfIn PDF document text
    • https://dp-silver.com/userfiles/file/72176525284.pdfIn PDF document text
    • http://zh-huaxun.com/uploadfiles/files/18750803475.pdfIn PDF document text
    • http://zamgph.com/uploads/file/040453157080.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/73402486308.pdfIn PDF document text
    • https://lazerom.pro/media/file/65356083005.pdfIn PDF document text
    • https://www.domosystem.gr/ckfinder/userfiles/files/tijakonivenafakuxazozovo.pdfIn PDF document text
    • http://maekuangudomthara.com/ckfinder/userfiles/files/97033881255.pdfIn PDF document text
    • http://generale-bureautique.fr/gdb/files/file/pidavesebivigedevevat.pdfIn PDF document text
    • https://evocative.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613297b2e1abf---20757124899.pdfIn PDF document text
    • http://perksys.com/userfiles/file/58784801611.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=justice+league+download+hdPDF 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_off0000d1ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1EA 10724 bytes
SHA-256: ca0bfdfbb0c82d0e28197ac1a1417ccb107850d2f5c42d30103850c8f8a6916c
font_01_sfnt_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 17960 bytes
SHA-256: e81602f1a85610ea77d1856c6157dbb4ce87ee91e60e9d3b4cbaf33633645e06
font_02_sfnt_off000118d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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