Malicious PDF — malware analysis report

Static analysis result for SHA-256 caaabde9d4ce77bc…

MALICIOUS

PDF

81.3 KB Created: 2021-10-09 09:15:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 899db5b886e6562d0860f89e09981a4b SHA-1: 851593a6e03da2900f7b2d532faabd946f819ade SHA-256: caaabde9d4ce77bce8e76b62bca168f58b6d6fc5809d4fc7cfd903091c6c8ea5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised CMS uploads. The presence of JavaScript and the link farm suggest the document is designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/1e72e1de99485c5baf9bf45ff57d21cc/53629031013.pdf
    • http://odontoflash.eu/userfiles/files/23340766989.pdf
    • http://tjjjsh.com/uploads/files/48773656269.pdf
    • http://faradtvandor.hu/picture/userfiles/file/40587701218.pdf
    • http://www.somdattabasu.com/fckimages/file/67839804867.pdf
    • http://qdjshg.com/files/file/tuwetazutirimigiwineken.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614ebf3ab28c9---49024191540.pdf
    • https://ohcsi.com/ckfinder/userfiles/files/pilevapirigejewiri.pdf
    • http://pazzo.jp/js/upload/files/76858957289.pdf
    • https://itandem.net/ckfinder/userfiles/files/45150238412.pdf
    • http://www.jysunshine-hotel.com/up_files/file/36416332358.pdf
    • https://nomortiga.com/contents/files/gamudexowesiselipajivige.pdf
    • https://dogathermalhotel.com/resimler/files/fujugabed.pdf
    • http://zezoalza.com/ckupload/files/12743847826.pdf
    • http://usateatop.com/_upload/files/19753156472.pdf
    • https://bachson.net/upload/file/63932279580.pdf
    • http://smart-ventures.ch/upload/Editor_Images/files/19802095415.pdf
    • https://elsa-daulte.com/ckfinder/userfiles/files/78635856384.pdf
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210924_DB888120C1AFF424.pdf
    • https://quatcongnghieput.com/uploads/files/ronaxesusuxib.pdf
    • http://www.naturhalles.fr/fckeditor/userfiles/file/rururuv.pdf
    • https://aiwatopup.com/ckfinder/userfiles/files/jufarisig.pdf
    • http://fnathservices.com/upload/file/dowokavaxus.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3206b5d6eaaf3f4d9a40ad5ef452bb0b/32719686762.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=energy+levels+periodic+table
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7f9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7F9 16792 bytes
font_01_sfnt_off0000f00b.bin
6b7eaf1d020eb72d8a7c58fed399d7d554060f874255ae650856e7f1c68ef06b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF00B 18096 bytes
font_02_sfnt_off00011e1f.bin
e8290f5e85f57ff9f353f3101355df5708f4fc0d85464fa98e787df0375359a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11E1F 10992 bytes

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