Malicious PDF — malware analysis report

Static analysis result for SHA-256 7837a76867076c84…

MALICIOUS

PDF

102.0 KB Created: 2021-08-11 10:42:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 384417203c86029687d9347b6603724c SHA-1: 598e2cd4e35c4919b707a4da6cac42988aa9183b SHA-256: 7837a76867076c840917a6a912900fe104f51b4b280cde2c71526c16633ca852
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised WordPress sites and disposable hosting. The ML classifier strongly indicates maliciousness, and the structure suggests a link farm designed to redirect users to potentially malicious content or for SEO manipulation. No scripts were extracted, limiting the analysis of direct execution capabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

Heuristics 5

  • 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 http://slphs66.com/clients/e/e6/e62fa13cff665df70d7481f632b33819/File/45024591615.pdf In PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/e6f2428595c7154dbfa4ce1a311f5f84/76843243524.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/35a4d59cf3c0d8677a7fb756437630c2/85619694436.pdfIn PDF document text
    • https://ikitellirezistans.com/upload/files/lojeboluwirosivubi.pdfIn PDF document text
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/38788sj14qu2iqk89hiab1c0ep/lukotujenugesajujesen.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/maviwojapobaxo.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080bd3d5f150---votoji.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16105ba3b2d34f---tenugalorurerawe.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/160da224dae8b5---zuvovejetadawekuviginip.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/v402qnbkr76oj9oqviu414u690/digiwefufa.pdfIn PDF document text
    • http://springgalleryng.com/Images_upload/files/pidesim.pdfIn PDF document text
    • https://ahha.az/userfiles/file/delimar.pdfIn PDF document text
    • https://freshchannels.com/home/sites/freshchannels/public_html/ckfinder/userfiles/files/3154511021.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/tozipapujobuke.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/160f9aef9a71d9---82681460484.pdfIn PDF document text
    • https://dubaimotorcycletours.com/uploaded_images/files/rijijedabugegebiket.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/009136cb43b974a3e9dd3b2b7c5a8cc3/kopono.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/90644604652.pdfIn PDF document text
    • http://airsoft1.ro/files/file/82624424.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd9afb9ea7---86677470724.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/gigekatufizovozimumo.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/136715af01eaf0b3ad00322439ac3531/jelivurad.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/43da7e33c01765b64e09bfc680790fd6/27968130132.pdfIn PDF document text
    • http://ubestsports.com/imager/files/20210803165954.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f2c402bb10f---43350457748.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=marriage+alliance+biodata+format+in+englishPDF 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_off0001299a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1299A 11056 bytes
SHA-256: 71ed073af9e15b1968297bf7bdd7f921cd7a3869163fb6b34fa67d1625f99ba2
font_01_sfnt_off000142e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142E8 17644 bytes
SHA-256: 201fc51f8099369093634ff81ce9b557bfdd4689d004a5cfdf9280eacf25bc3a
font_02_sfnt_off000170c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x170C6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.