Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcda7d408809770…

MALICIOUS

PDF

89.6 KB Created: 2021-07-30 21:44:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 699f3a3db9def2078c6773a4c26096e7 SHA-1: 00a02830921f52a1e8b0996fee2b462c7120cb67 SHA-256: 9bcda7d40880977017b11436d71bf9404b403ffe426e18439561303a9c42c130
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to direct users to phishing or malware download sites. The document body is heavily obfuscated and unreadable, providing no direct user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • 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://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160810a3da210a---nifazesibokenubojexik.pdf In PDF document text
    • http://www.logomarcanet.com/userfiles/file/43838100668.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/j2sl2crvne378mf92gnc1hj477/lafobapubexinadifele.pdfIn PDF document text
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4364f45513---96522870215.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/xuwuxekavudorebatufixon.pdfIn PDF document text
    • https://www.eos.org.eg/ckfinder/userfiles/files/golinifovipazevumiruda.pdfIn PDF document text
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/b529e62a250e7dda11e445f588a8a800/22969329440.pdfIn PDF document text
    • http://orhs86reunion.com/clients/6/67/6744625166a0df26c7abb40948833271/File/37113000072.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/32383615412.pdfIn PDF document text
    • http://heyumpnd.com/userfiles/file///junoj.pdfIn PDF document text
    • http://www.nomorcantikjoss.com/file/zizojakopajoveralol.pdfIn PDF document text
    • http://hhcreunion.com/clients/4/43/43f38dc94a4d709fe78decf5bd9d7370/File/50823920117.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/fede41c71ebf9b0652de1c9be23b2ab3/sutoxelem.pdfIn PDF document text
    • https://angelsstaff.com/uploads/file/28379288810.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/7166828516.pdfIn PDF document text
    • https://africanresearchcenter.com/userfiles/file/rukifise.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/fo2ki8m9a2oeni9ch2hf6rnhg3/sigujibenopusozitatosif.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/78b8f89a64e01468c8d23c58d8b19e59/tifijogi.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075024eb7ea3---18636388219.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/5a9bc6fae4459c566ff4ad465d81929b/jideseziweveranunibe.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/50629a72dbf466b19193dfdaafe2a8ba/damonero.pdfIn PDF document text
    • http://www.oteliapelsin.ru/ckfinder/userfiles/files/55540254651.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+work+harbor+breeze+ceiling+fan+remotePDF 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_off0000f858.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF858 10984 bytes
SHA-256: f55f6adbd8e4b40b7e1530b28c0c394d3ccd8772901f0b50b0ae70682eb3efe0
font_01_sfnt_off000111b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000129cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129CB 17588 bytes
SHA-256: 5dbb18482f839b2b48838b440b25a086aa7a13c817d9ed4a7f5835dd17fda8e0

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