Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd9e75950e877a4…

MALICIOUS

PDF

97.0 KB Created: 2021-09-12 14:00:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: c15f893cf90f769a99b169d930cdc486 SHA-1: 2e1261bd5959cb9de95d6c6cc75a29788aefd929 SHA-256: 3cd9e75950e877a4182765d738a43924591f71ac9328d567c8eb76f08401023e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external URIs, many of which point to compromised or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a non-clustered link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://studiochiodo.eu/userfiles/files/85216262375.pdf In PDF document text
    • http://peetersinstallatietechniek.nl/upload/files/sojirejineligavubosus.pdfIn PDF document text
    • http://www.greenfield-sustainability.com/images/files/71805626768.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/37422158605.pdfIn PDF document text
    • http://hokkaido-love87.com/app/webroot/js/ckfinder/userfiles/files/fidemafulojo.pdfIn PDF document text
    • http://semanbio.com/upload/files/97476700456.pdfIn PDF document text
    • https://titishop.co/upload/files/91320162386.pdfIn PDF document text
    • http://www.lasallelille.com/admin/ckfinder/userfiles/files/vumejimeme.pdfIn PDF document text
    • http://domki-kopalino.pl/pliki/sotorivurufagikorubexutev.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/pamajabibujurexukarezab.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b31b353e66---1093913999.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/fegezulanopeli.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/doravukatiw.pdfIn PDF document text
    • https://bettenbaehren.de/wp-content/plugins/formcraft/file-upload/server/content/files/16132066d03516---ziwijovezawukuso.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/19991567745.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/1613521f956eaf---sosubepivuzamiteneti.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/76374069285.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16132fc595443e---17541232196.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/memozabifaponodokopazaz.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/70820114130.pdfIn PDF document text
    • http://dspec-car.com/js/upload/files/gadimu.pdfIn PDF document text
    • http://hankyunget.net/userData/board/file/fuzutani.pdfIn PDF document text
    • https://grup-insaat.com/userfiles/file/21225769870.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=vector+calculus+problems+and+solutionsPDF 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_off00011526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11526 18296 bytes
SHA-256: 496b144cb495466b45e6da47a5e298e645a5ba0c1213ee69e116f1fb4bab0048
font_01_sfnt_off00014535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14535 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015d4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4C 10884 bytes
SHA-256: f356aa60620e65741a96f8a6f4b2528728041917ba827422d5b539f1f9f4062f

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