Malicious PDF — malware analysis report

Static analysis result for SHA-256 c78b7fca15a2df4e…

MALICIOUS

PDF

76.6 KB Created: 2021-09-06 16:06:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 0302ddf3bddb196f37d1ffbebef0ddb2 SHA-1: 58e2e506813dbc409b4dc4710f72039ac8704cb8 SHA-256: c78b7fca15a2df4ec88385dd4cff146a14b84bf8c2868e2a1e08401b396390f4
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 7

  • 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.
  • 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://inbeeldt.nl/userfiles/file/79870407774.pdf In PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3ac3c2ff80f443f8bd7b137b3dd58eb2/ralisobusolemij.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/nvfh8smmedj753thl7l3ano5m1/15229658574.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/jekozuvoviwozonuro.pdfIn PDF document text
    • http://seamacros.com/upload/file/suvoluwolafijen.pdfIn PDF document text
    • http://4x4autok.hu/userfiles/files/18252799506.pdfIn PDF document text
    • http://vincitydata.com/uploads/ckfinder/files/pirasuriz.pdfIn PDF document text
    • http://jainfarms.com/uploads/golozemopovetipomixopug.pdfIn PDF document text
    • http://hz-karavany.cz/ckfinder/userfiles/files/zoxemuxudubagu.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/gavewufusulipukexekimum.pdfIn PDF document text
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/0ea2c1ba2e9cb0146b1836541e8cb114/86740476276.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/devosavozona.pdfIn PDF document text
    • https://marigabung.com/contents//files/89576779757.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/c3mnlqnjfavuuoui897b2mp4j3/xegubaxumuxurezukalef.pdfIn PDF document text
    • http://tourgrodno.by/images/content/file/jededepikaxomawesimirub.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1606f75fed95c8---kuxedukafifalowuwazanibe.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fe40d8901a7---84322451445.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/jufesikowaparuti.pdfIn PDF document text
    • https://linlinline.biz/js/ckfinder/userfiles/files/83535032447.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/79842715028.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/sesisipuwegimafuk.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=afmc+previous+year+question+papers+with+solution+pdf+downloadPDF 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_off0000c3a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3A3 17764 bytes
SHA-256: fa55f3a3ca075c2ec4f17fbfe60fb085df15fd48b6988579b4e6a8363c3f865c
font_01_sfnt_off0000f1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1D2 11376 bytes
SHA-256: 872071ccb48675f295a0a2b836ee14c91a127f9758255fd1a09c770efa55a024
font_02_sfnt_off00010c5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C5A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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