Malicious PDF — malware analysis report

Static analysis result for SHA-256 55602c05d751d0a0…

MALICIOUS

PDF

89.5 KB Created: 2021-09-08 10:35:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bfba8e5950503e6b1315eb566b7c289e SHA-1: 95628cb546c58e684e0eb5ac3aafe1cd2cb8884f SHA-256: 55602c05d751d0a0b4eb6f0a7072b7db7c1d9089b63e88724ba67340da3a4ea8
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified by ClamAV as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing campaign. The presence of external URI heuristics and link farm indicators further supports this. No scripts were extracted, but the PDF structure itself is used to host these malicious links.

Machine Learning

  • Nyx PDF Classifier clean score 0.1534

Heuristics 5

  • 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
  • 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://ranjitabiswas.com/userfiles/files/60924243554.pdf In PDF document text
    • http://skncn.com/u/files/8526834277.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609459982d532---85265972598.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/tipawa.pdfIn PDF document text
    • http://cmorshomecareassociates.org/uploaded_files/userfiles/files/vedasubeviji.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/6766690352.pdfIn PDF document text
    • http://lmyc.net/clients/875386/File/49240920014.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f84c6570396---xuraditedilafuz.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/tukupozoxamikufemodazaf.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609834db9f227---vuwimuloj.pdfIn PDF document text
    • https://naucharts.com/ckfinder/userfiles/files/vugizoxi.pdfIn PDF document text
    • https://zoorichi.com/temp/fckeditor/file/gitawirozekemavoxo.pdfIn PDF document text
    • http://naturallabs.fr/userfiles/file/43852753523.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/2568d8211d5e63fb32ab1590b0782ef8/51497480010.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a4216bca7---78315003052.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b85ef33acbf---siparunetu.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075769009b36---litolibipilo.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609db965e4bec---xowatedazoraveziroludumug.pdfIn PDF document text
    • http://xn--b1afklwjc5g.xn--p1ai/ckfinder/userfiles/files/fuwixinotasajavigama.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160739d7b6c69a---vejawizotadekitavukabug.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/nilaluripekononoxamawiko.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbf0fcb2ab5---pafuzilukexikewubarubidu.pdfIn PDF document text
    • http://sbsinternationalschool.org/sbsisnew/userfiles/file/86522313402.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/79893327723.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-12/20210512073420259308.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=bizhub+363+manualPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12894 10448 bytes
SHA-256: 4aa500b6823e61b3739c690824edd1eb55ecbff1cdc7987f65372bbb2c3a3678
font_01_sfnt_off00014006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14006 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1