Malicious PDF — malware analysis report

Static analysis result for SHA-256 926209c26e903d56…

MALICIOUS

PDF

105.6 KB Created: 2021-10-13 21:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: a944067a7c30ee3bb11c824d5e4dadb0 SHA-1: 34b08c72e7a27db5e3002abcb9677bca159313da SHA-256: 926209c26e903d56cd917704534830762f29b663d4737ee308c8a784c1cc5e9c
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many pointing to compromised CMS upload directories and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of a malicious document, potentially leveraging embedded JavaScript for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://mlspoland.co/files/file/11341241465.pdf In PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/73275109401.pdfIn PDF document text
    • https://podiummagazinenews.com/ckfinder/userfiles/files/winejuxobowuruv.pdfIn PDF document text
    • http://savoie-outils-coupants.com/ckfinder/userfiles/files/xetomomizumeji.pdfIn PDF document text
    • http://buyyoutubelikes.com/ci/userfiles/files/guvubo.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/23143285056.pdfIn PDF document text
    • http://thanglong.vn-greenenergy.com/ckfinder/userfiles/files/23388054971.pdfIn PDF document text
    • https://ikincielinmak.com/upload/ckfinder/files/12544238800.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae849f2c21---mular.pdfIn PDF document text
    • http://bakoca.hu/files/file/60727445949.pdfIn PDF document text
    • http://studiotecnicopetrillo.eu/userfiles/files/zanogoxivowi.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614da2d57b5c1---20765917732.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210923131807.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/kgfo3lj8b3tocu97ijldf0ua97/7795708991.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/20661471130.pdfIn PDF document text
    • https://euinsuti.uniluxgym.ro/app/webroot/files/userfiles/files/13687206873.pdfIn PDF document text
    • http://firesecurity.sk/userfiles/file/52315634186.pdfIn PDF document text
    • https://csn-alliance.com/data/files/likonefadeze.pdfIn PDF document text
    • https://norservis.info/files/files/zodabofatejagafo.pdfIn PDF document text
    • https://vinacoma3.vn/userfiles/file/lipig.pdfIn PDF document text
    • https://verticala.ro/images/userfiles/34735753534.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/43771617240.pdfIn PDF document text
    • https://gym-rectif.fr/ckfinder/userfiles/files/kikonenanakifupon.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/faufkeof877057lbu9d9acf6c3/piwuxobidatuketimapigepe.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/D9plVHj2VOU/uplcv?utm_term=hymns+to+the+silence+van+morrisonPDF 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_off00012f79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F79 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001478b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1478B 22108 bytes
SHA-256: 03b5e8f0b8aff2c16a61fe8520471b3a8391b290ead56eab0f9da4c6ff71c155
font_02_sfnt_off0001805c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1805C 10664 bytes
SHA-256: 65a4587f6da53d9ae99f91268c0f077d2f492fc5d28e6c0c638bfbfac469275c

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