Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e580b745ac690eb…

MALICIOUS

PDF

77.3 KB Created: 2021-09-08 16:38:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8eaa830c4a39fe751977cbea84110a5e SHA-1: fd4229d6089aa891f9b9ac778b10855485974b59 SHA-256: 8e580b745ac690eb42374254e0683eabdf3a8a8f6184d9d37a3310d307e14036
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous links, many pointing to compromised CMS upload storage and disposable hosting, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is heavily obfuscated and unreadable, providing no direct textual clues to its purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345b1b51862---simegogemidetuwasanufeza.pdf In PDF document text
    • https://kar360.com/resimler/files/tonefewofugikasilalegubaw.pdfIn PDF document text
    • https://it-remarketing.pl/app/webroot/media/files/denevamab.pdfIn PDF document text
    • http://astprom.ru/sites/default/files/file/92308391739.pdfIn PDF document text
    • https://aiaciran.org/cache/fck_files/file/beledixaleramipuxenimim.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/jeretazuwurabopijopamu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/93820389cd42c2d3e2de3f2f420e3a5f/notekinunesowuvafuxupebok.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/161316304842c2---kuvinidabedegabudizapowo.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16132637861d8f---79015036617.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613849e6e102f---supofexajufiso.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/6533511547.pdfIn PDF document text
    • https://webaprint.be/img/file/46445065559.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/96231344558.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/80143262565.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/1751558329.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/busukalagemevutexunip.pdfIn PDF document text
    • https://people11people.gr/uploads/File/ditaxirosoborobal.pdfIn PDF document text
    • https://clove7.com/userfiles/file/75420903248.pdfIn PDF document text
    • https://camelcarpet.org/d/files/75310893792.pdfIn PDF document text
    • https://eminenceconstruction.ca/viking1/uploads/files/62616480856.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/31269571335.pdfIn PDF document text
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/23015169250.pdfIn PDF document text
    • https://jss-moms.si/upload/File/nudedelipizoduposapar.pdfIn PDF document text
    • https://hbphoto.ca/resimler/files/waxoxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=i+love+pdf+convert+ppt+to+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_off0000ccc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DF 10208 bytes
SHA-256: c504f95661aa1592095b6a63099291b65477c002867e33d46af93a1ce227ba1b
font_02_sfnt_off0000fbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBDC 16756 bytes
SHA-256: c48b3f39f7ccb37c0d150add25a017a404f7f488e66b2567166a6b4481d0aefb

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