Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d547abe0315f3df…

MALICIOUS

PDF

76.3 KB Created: 2021-08-26 09:19:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8133733fc44c345e6aaa5dd54d023f9a SHA-1: a1b09b70c555abcf7db038bea306ba7587bb1e6c SHA-256: 9d547abe0315f3df16a018cb1cc84e88f3e8523518c66040fb3fdea138fbbe43
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file functions as a link farm, directing users to multiple unknown PDF files hosted on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The primary attack pattern involves luring users through a seemingly legitimate document to a network of malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://camgloberealtor.com/userfiles/file/5672704912.pdf In PDF document text
    • http://collegedelunion.com/clients/76066/File/72995604912.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/76685634848.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/83ef86027750d8630c18f609c96d5425/wamin.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/jepala.pdfIn PDF document text
    • http://twtipa.com/upfile/files/2021/07/17/68526626450.pdfIn PDF document text
    • http://techscreening.com/userfiles/files/komadovoribewogivid.pdfIn PDF document text
    • https://grancom.by/upload/docs/59748938392.pdfIn PDF document text
    • https://alllegaltask.com/wp-content/plugins/super-forms/uploads/php/files/s0p7ti4bh2v52le50l1b8o1a49/22275454938.pdfIn PDF document text
    • http://tai-group.com/upload/files/40931192049.pdfIn PDF document text
    • http://ascensionchina.com/userfiles/file/14014682546.pdfIn PDF document text
    • https://gregor-biffiger.ch/userfiles/file/lubarinat.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/purifibu.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a83643ced14---94093102027.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087fa0c139cf---mawovizirodenulov.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/nisepofatimamovevu.pdfIn PDF document text
    • https://luxmarketing.agency/wp-content/plugins/super-forms/uploads/php/files/p9i2ir2cufq655lnlk0ch794pu/27983517075.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da6b59a165f---53069299214.pdfIn PDF document text
    • http://tropo-design.com/ckfinder/userfiles/files/92468255938.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/aace417ca5a706447c899ca9a061b99f/37749999177.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/51299703089.pdfIn PDF document text
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609822a69ab7d---93330261594.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/ripafejako.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=whispering+pines+kissimmee+flPDF 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_off0000c70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC70F 17320 bytes
SHA-256: a94dcf6c84334cf5f62f5b19b20f9de5389df1e8d176564bbc72b004957abff9
font_01_sfnt_off0000f387.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF387 10508 bytes
SHA-256: 60afd8e559b5adcbda6662f23fee1b484000579153b98e7f0d07c65826052c36
font_02_sfnt_off00010b35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B35 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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