Malicious PDF — malware analysis report

Static analysis result for SHA-256 f47f63eab6b5ddc9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-08 10:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ba7011e35dc15130b7962bbcba2f37f8 SHA-1: ea8603f24d5264fe775bfa86c77278e31c8f5bae SHA-256: f47f63eab6b5ddc933a2a8e03324bf765201d16b8f45e6651081fdf11f7d1413
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to compromised CMS uploads, suggesting an attempt to host malicious content or redirect users. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16086aa9d6a7b3---zujekofugadivugo.pdf In PDF document text
    • http://d2dgroup.net/upload/files/45133957656.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/josuputinasosajuno.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/160d1f99401880---witepoxukesax.pdfIn PDF document text
    • https://www.puskinas.lt/ckfinder/userfiles/files/porefodedusuwemetufen.pdfIn PDF document text
    • https://mediabandit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083f77d68a3b---wuwuwupirabovapemos.pdfIn PDF document text
    • http://henca.com/files/details/file/jepisujuwalirosowamega.pdfIn PDF document text
    • http://eatatrudy.com/uploads/files/30058314886.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/83891043666.pdfIn PDF document text
    • https://golf-tout-terrain.com/publish/page/file/vivokolonijetifof.pdfIn PDF document text
    • https://menu2uplus.com/images/file/lokodibewemilimagosirag.pdfIn PDF document text
    • http://systemsbiology.at/uploads/assets/file/jegebowig.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a830e1a1d93---75494692688.pdfIn PDF document text
    • http://iburgisidimarsala.eu/userfiles/files/xotininomidudoma.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/98300880408.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/61477967644.pdfIn PDF document text
    • http://danielbushreunion.com/clients/41596/File/rukojinakaderinevuloluz.pdfIn PDF document text
    • http://anpo.vn/upload/files/towamuzevuliruzami.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/temilofeduvaletaderusikej.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/kumabewanusagisobipino.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16096f69b136df---visuw.pdfIn PDF document text
    • http://szakkepzosiklos.hu/upload/file/gipidoxelageso.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/61497965154.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=patient+manual+handling+course+naasPDF 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_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 17308 bytes
SHA-256: a04892dfb6be0de800840a8fa03b42905433b8f4603fdac934357767ab5e87b6
font_01_sfnt_off0001013e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1013E 10920 bytes
SHA-256: 68a197e96583bc3c5a5889975a29a87c05af14a5400b9c3438fad54f192a36b6
font_02_sfnt_off00011a14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A14 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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