Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea96febd7cf65123…

MALICIOUS

PDF

82.9 KB Created: 2021-09-15 01:30:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7e2b105d92fb6ef3f1ed40e198fd89bd SHA-1: ea4e47466bd1ff03e50d246b81a575d3ebfa2cff SHA-256: ea96febd7cf65123d859372883d1757f20a99107f214904e7e2a01969d33e60e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and a significant number of external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The embedded JavaScript likely facilitates the redirection or further payload delivery, contributing to the overall phishing or malware distribution attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://coretry.ru/uplcv?utm_term=how+to+record+voice+message+on+android PDF link annotation
    • https://pametnidom.hr/pametne_kuce/userfiles/file/35064824383.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/h46he6qkvvhr9tnsfgcgonb7bn/12710989305.pdfIn PDF document text
    • https://ataru.site/js/ckfinder/userfiles/files/nezeru.pdfIn PDF document text
    • http://104408017.linker.tw/files/juposuwutajevaponigo.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/63882835837.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/50666807002.pdfIn PDF document text
    • http://youngdongtec.com/userfiles/file/lusopur.pdfIn PDF document text
    • https://birudongker.com/contents/files/kibataze.pdfIn PDF document text
    • http://billsky.ee/files/file/79351479724.pdfIn PDF document text
    • http://elementyzlaczne.pl/media/file/fupajum.pdfIn PDF document text
    • https://jaukiaplinka.lt/ckfinder/userfiles/files/vakubo.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/kovovep.pdfIn PDF document text
    • http://nationalcoopadvisors.com/userfiles/files/gutesokopivesigubeben.pdfIn PDF document text
    • http://cck-brno.cz/ckfinder/userfiles/files/mivifuvazonofegilefovat.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/07t8t2mq5md42t00bea9ef0rfu/42491174458.pdfIn PDF document text
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/53a0daap9t50q89o7h3cp7kcrh/pexamepojovadazabuba.pdfIn PDF document text
    • http://africareview.in/userfiles/file/81733855038.pdfIn PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/34749161626.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/22274193149.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/giboj.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410ee8e8dc3---losugir.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614111b0d4f83---vorojepo.pdfIn PDF document text
    • https://propage.q-cloud.net/upload/ckeditor/pages/files/piripututoselavoju.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/tefavamigebugeponu.pdfIn PDF document text
    • 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_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 17152 bytes
SHA-256: b65ef1479827075631abd92b52ef3d45347b070b159a1050b747846d7c197628
font_01_sfnt_off00010c90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C90 10808 bytes
SHA-256: 4508a1ae414b3eefa807ce3f46a91b48cb17ebd90450d4d044320eac5e5d4833
font_02_sfnt_off0001254e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1254E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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