Malicious PDF — malware analysis report

Static analysis result for SHA-256 3839ecce0829acac…

MALICIOUS

PDF

78.3 KB Created: 2021-10-12 09:05:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 4293f890f57c56441d2cf83b6984a2d9 SHA-1: c0b3367e2caa4d991fdecf50ab2a11bf7520e439 SHA-256: 3839ecce0829acac4a5a0c84c7767bc39660ecc294c5404b7c4032466a838ee0
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript suggests it may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/427c9272883ecf092db770628bb88c6d/vusoralum.pdf In PDF document text
    • http://kalistechnologies.com/userfiles/file/vikatamajetelawi.pdfIn PDF document text
    • https://www.oalysa.cz/ckfinder/userfiles/files/63830235127.pdfIn PDF document text
    • http://salonlomi.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613000a7c4ce4---kikukowigitujoziwibobozib.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/161454aa60988f---vepozibawomutufuponapuj.pdfIn PDF document text
    • https://automatisme-portail-bordazzi.fr/userfiles/fichiers/52647158117.pdfIn PDF document text
    • http://kurumakaitori-one.com/js/upload/files/18771176968.pdfIn PDF document text
    • https://zweefvlieg.net/userfiles/file/fafibafixovesabumatevogox.pdfIn PDF document text
    • https://markyatirim.com/resimler/files/wakipowuredekusabojat.pdfIn PDF document text
    • https://ofcourselc.com/admin/uploadsfile/jinumiterumapipavija.pdfIn PDF document text
    • http://textstricker.de/benutzerdateien/67386694914.pdfIn PDF document text
    • http://lnyuanzong.com/uploads/files/20211008132407.pdfIn PDF document text
    • https://www.frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/72058633952.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/lekozetulazid.pdfIn PDF document text
    • http://aztkgbv.love-mrt.com/upload/files/nixijugufuwowipajozati.pdfIn PDF document text
    • http://sunnysolutions.it/uploads/assets/file/94634941129.pdfIn PDF document text
    • https://allora-tour.by/var/upload/file/pireligarajujivokugun.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/welasizubesikotolekigug.pdfIn PDF document text
    • https://btsis.com/upload/ckfinder/files/72193840250.pdfIn PDF document text
    • http://ingmarcofaedi.com/userfiles/files/pizefoforowajewovet.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615b629677f36---lorizifutuzidasigir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/tgwjJlsMqHc/uplcv?utm_term=down+syndrome+associationPDF link annotation
    • https://easyown.ddproperty.com/datas/files/boboxuru.pdfIn PDF document text
    • 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_off0000cd8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8C 10688 bytes
SHA-256: 2173b647db72d879b1252c4ad195b91eb149ca75b1e6ce11ce0ace0d6d0360cf
font_01_sfnt_off0000e622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE622 17488 bytes
SHA-256: 5a15bf3550a6de5e4e442699616c0233010fbe6b047449c0a3f5526916ec1e56
font_02_sfnt_off000113b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113B7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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