Malicious PDF — malware analysis report

Static analysis result for SHA-256 d775444c66962bf7…

MALICIOUS

PDF

104.0 KB Created: 2021-09-03 17:30:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5beeba0cb6c979e41da03a46bd91c1dd SHA-1: 6c037dcbba17ff9450620e77e53c040dc806e50b SHA-256: d775444c66962bf7a952a0c269eb781630f6e5b2b158a9a147be047a8cbc5a03
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of embedded JavaScript and a large number of external URIs, many pointing to compromised or disposable hosting, indicates a link farm designed to redirect users to malicious content. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9926

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 https://fiscalonline.ro/app/webroot/files/userfiles/files/74225162105.pdf In PDF document text
    • http://royalwedding.jp/images/blog//file/rojapopepodejafakube.pdfIn PDF document text
    • http://hiace-yoshikawa.com/js/upload/files/fapixudilezelaboferu.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/99018296953.pdfIn PDF document text
    • http://caycanhtuyhien.com/uploads/image/files/dugexugenefizitinova.pdfIn PDF document text
    • http://bioterapiazabiegi.pl/obrazy/file/lejepolile.pdfIn PDF document text
    • http://uticahighclassof78.com/clients/8/89/89c70e22fe5ad1405280b455f64975d7/File/60960184493.pdfIn PDF document text
    • http://georgeandmaryjones.com/clients/f/ff/ff66b05efb8f16ea353d8e6908bb1429/File/2406800483.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b802ef4f4c8---30978148336.pdfIn PDF document text
    • https://ezgoe.com/10005001208290177/ckfinder/userfiles/files/75329440223.pdfIn PDF document text
    • http://sanders-scottfamily.com/clients/26926/File/37958764854.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/1606d313c656de---2798271542.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cec4ad59445---14494808836.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/74339224652.pdfIn PDF document text
    • http://ucinnovation.ru/admin/ckfinder/userfiles/files/56378278045.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ca5be6228---33678521887.pdfIn PDF document text
    • https://laserbeautymachine.net/d/files/58135955612.pdfIn PDF document text
    • https://rsebolivia.org/userfiles/file/siwixunamurulusevalisala.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/sonafubafapafelas.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/15223847136.pdfIn PDF document text
    • http://gelikonline.ru/content/Files/79305447445.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/ffed28a81502f78d78edad2a81675794/mamomukufupiwufes.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/i1v4cr2s5m7agnr9qr55lchcns/fapimejepefin.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c8e1690600c---84663016786.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=servant+leadership+articles+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_off0001314c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314C 10736 bytes
SHA-256: 81e749b832c10ab61848bdc81621c5a43494fca763dc5760c50b9abd63bf0ddf
font_01_sfnt_off000149db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149DB 18760 bytes
SHA-256: dc34a274ad5c48e62b7fc5176bc2b3fa93e607ddbd2a920c2f2bacc7c6c91579
font_02_sfnt_off00017a60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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