Malicious PDF — malware analysis report

Static analysis result for SHA-256 334d5ac6cf2bbc82…

MALICIOUS

PDF

71.0 KB Created: 2021-09-04 11:56:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: efdde92356241c0851c11bab4b0cb31a SHA-1: d5a2f8bc0a2b534fa0241baaddf0ef28a2692b65 SHA-256: 334d5ac6cf2bbc822469ce3bbb8c40ebc060c1e7923c188077861dc2c95dfe23
156 Risk Score

Malware Insights

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

The PDF file contains a link farm with numerous URLs 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 for phishing or malware distribution. The presence of multiple external URIs and the link farm structure suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.tocbirsen.org.tr/ckfinder/userfiles/files/labunawugafapotax.pdf In PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160c8582b52f1f---10372892167.pdfIn PDF document text
    • https://joyfool.art/wp-content/plugins/super-forms/uploads/php/files/9d80058b46a9f7bc1e99e66b97972d6c/ninugurupeni.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/76208d5a08227d23a6a5086ae9f3b982/77194950344.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/nnno3ahmlhqcorh5dhmk4i746e/89890444297.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/967f283a9fa2642e8d6ffe4fa01b1028/18789885218.pdfIn PDF document text
    • http://sacoorhealth.pt/site/upload/file/87077011026.pdfIn PDF document text
    • https://snqrsl.quebec/upload/editor/file/kinabotefesodavo.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/81212288908.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/7dpo99p8frej05aubm66djhnh6/31018740515.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/bb79331e51580deafc651e169b729d04/kesakaputo.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/79656930275.pdfIn PDF document text
    • http://www.ausafrica.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080c0269a6b9---nuduxepuful.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/6528351684.pdfIn PDF document text
    • https://jager-ig.tw/up_photo/file/65468278.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/29820070653.pdfIn PDF document text
    • http://steakpluspizza.us/userfiles/file/29540838837.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16074362400ef5---busagijavunofibedu.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/kixuxajowurugorur.pdfIn PDF document text
    • http://ddservice-bmw.pl/userfiles/file/31077500173.pdfIn PDF document text
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd58783016883f92c3cadf9a57a70717/92058747377.pdfIn PDF document text
    • http://trunglam.vn/uploads/userfiles/file/zutonogevokumi.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/rokejini.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=pdf+globalization+and+its+discontentsPDF 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_off0000b571.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB571 10752 bytes
SHA-256: dd42652ec043bbae74e30b8b99cdb82c7ccdfbedb6e462c5abc66dc59a471a7a
font_01_sfnt_off0000ce25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE25 15660 bytes
SHA-256: e677540cd0b0ba2bb4ee6a0336b73c5b92c816a0712d2e2d5c6f52403cd22443
font_02_sfnt_off0000f676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF676 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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