Malicious PDF — malware analysis report

Static analysis result for SHA-256 425a3be19775138d…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 13:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 727991dcddbba057d99e84be8fc44262 SHA-1: 33306057433a71c2f3397596aeff72ce6f5a770d SHA-256: 425a3be19775138d695bb447c1452db7b3fd2130d33cd0240f79abd235314bac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by a ClamAV signature and an ML classifier, indicating a phishing or trojanized PDF. It contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics point towards an attempt to distribute malware or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 http://mexvp.com/ckfinder/userfiles/files/napulejazawesuriguvol.pdf In PDF document text
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/0c4d11c9814ff6a532fc49670347faae/62497688238.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/39502232898.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/92574775676.pdfIn PDF document text
    • http://brlairport.com/images/file/kudiwur.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc0df546b87---senewev.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b57be2dac5d---liduluvovos.pdfIn PDF document text
    • http://www.canadavisaservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609da7a9e33fb---25275136887.pdfIn PDF document text
    • https://sharadsangam.org/UserFilesTwo/file/gifuwetefefezima.pdfIn PDF document text
    • https://bacninhonline.com/webroot/img/files/pijizibemudu.pdfIn PDF document text
    • http://chonburi33.com/userfiles/file/8220813590.pdfIn PDF document text
    • http://arablift.net/userfiles/file/kusozosevon.pdfIn PDF document text
    • https://www.sadcmedia.com/wp-content/plugins/super-forms/uploads/php/files/0kpre2l0ikkp5mol33sdn4u84k/wokilipirirenazovanurema.pdfIn PDF document text
    • https://pacantioquia.org/aym_image/files/jonadixidakekuwujosix.pdfIn PDF document text
    • http://artkulinaria.pl/sites/default/files/file/wajisudijejejamazij.pdfIn PDF document text
    • https://urbanplace.me/wp-content/plugins/super-forms/uploads/php/files/9514424899deec53c803d20b69fd2bdb/sosiwibuk.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bbcb5eadfa---bejelefovopuvoxorisobel.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/8b7133b5bf30d21f253922fd9f7eb709/fefamulolin.pdfIn PDF document text
    • http://www.bordadoindustrial.com/ckfinder/userfiles/files/38388675108.pdfIn PDF document text
    • http://lordbeaverbrook1973.com/clients/76835/File/8460714074.pdfIn PDF document text
    • http://parilka.by/var/upload/file/mabifukup.pdfIn PDF document text
    • http://www.annaleehuber.com/content_files/file/15955336218.pdfIn PDF document text
    • http://insidethedigitaltrend.biz/userfiles/file/purukaxixajenubi.pdfIn PDF document text
    • https://www.hotelrestaurantmacarena.fr/ckfinder/userfiles/files/74652108157.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/95280716822.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=correct+the+spelling+mistakes+worksheet+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_off0000d89d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89D 17348 bytes
SHA-256: 208a6b44d9675b8a84237be0351066b1ac46e2bbb9cdd65ec15d089a8ddcc7a8
font_01_sfnt_off0001057a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1057A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011d91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D91 11276 bytes
SHA-256: fd8b1c829b4d14c919bb91be2a9af6dc635863a5073c39ff21572899c1dc75e3

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