Malicious PDF — malware analysis report

Static analysis result for SHA-256 94a43896c92c404a…

MALICIOUS

PDF

86.2 KB Created: 2021-07-31 11:51:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: cafadf094c88e98326591ffd32008694 SHA-1: aa98013d3c479ebda31a629159b1aca5946078b2 SHA-256: 94a43896c92c404a8a9875266ed2f8995e2674a746ede6a51b8fc07e319331c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many pointing to compromised WordPress sites. These links likely serve as a link farm to redirect users to malicious or phishing content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://smidgel.ru/uplcv?utm_term=last+date+of+assignment+2+submission+aiou+spring+2020 PDF link annotation
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16081ac56ce833---51278535161.pdfIn PDF document text
    • http://hrudolf.com/userfiles/xarenikevufuneretixewomo.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/71872472227.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/86151020203.pdfIn PDF document text
    • https://tecnicadovolante.com/images/file/84904365343.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e29e7848202---lakofatizetetuvaniko.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/41affabbb533b0df66ec4eaad97a5673/risofuvagozufumi.pdfIn PDF document text
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/b1a245cb4d8da2a2f89459cb66405ab1/43182013194.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0eff84d54---33482132783.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12ca5c70f---13586421774.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/gonifuwopopaki.pdfIn PDF document text
    • http://oticonshop.net/ckfinder/userfiles/files/tiwitojoxusobov.pdfIn PDF document text
    • http://logiccpacma.com/ckfinder/userfiles/files/66944881481.pdfIn PDF document text
    • http://epicridesnepal.com/files/tofuvezitobinagidulepuzum.pdfIn PDF document text
    • https://motelandratecuci.ro/userfiles/file/xenisalawifugiwutuweb.pdfIn PDF document text
    • https://people11people.com/uploads/File/37113185411.pdfIn PDF document text
    • https://ryokanclub.com/FileData/ckfinder/files/20210730_B95562CA3A8DB2D1.pdfIn PDF document text
    • https://blnk.eu/userfiles/files/dupetifumojaki.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/of8pljf7l1mss7700ifsmh8aba/96481967728.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///vuvovabiwel.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/95785575925.pdfIn PDF document text
    • http://epoch-making.jp/js/upload/files/jebosonakogigijunidoju.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_off0000ea4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA4D 17536 bytes
SHA-256: 475cca9522307294c3de82cba3db15463af7b693743b260cd5a8f433fc3be768
font_01_sfnt_off000117b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117B4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FCB 11236 bytes
SHA-256: de0ced4318fa3bc39b8e1bc96611dee7a68815e61b68366dca635069a293cd31

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