Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8be20bcba244ffb…

MALICIOUS

PDF

101.5 KB Created: 2021-06-10 10:59:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: f9b0e8fd9965e1a9cbd7b89129d8fddb SHA-1: 197634e5d62348953d198e81d4c3ce23e2edc42c SHA-256: f8be20bcba244ffb9e68df328508e1d429609ba5b50c8c5382b93bd4049eb46c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to distribute malicious content. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports a phishing or malware distribution intent. While no scripts were explicitly extracted, the nature of the URLs and the heuristic firings indicate the document is likely a lure to download a second-stage payload.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4914

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://irlanc.ru/uplcv?utm_term=bhaktamar+stotra+sanskrit+pdf+download PDF link annotation
    • http://naturallabs.fr/userfiles/file/90362277473.pdfIn PDF document text
    • http://www.celso.org/download/dejaragekulatuzepi.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/24276790098.pdfIn PDF document text
    • http://adamslakeband.org/userfiles/file/54393332975.pdfIn PDF document text
    • http://budohurtsa.pl/userfiles/file/83150645548.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/dofixukimotatilo.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/k1dnhh2r9cqr25ki6f9vv0vs35/tatanop.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c9b3663856---kuterexukube.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/e67594e55f95eeb9e3f564dd1f71659f/buxalunijibew.pdfIn PDF document text
    • https://binhruamuinanobac.com/wp-content/plugins/super-forms/uploads/php/files/g0uipu66jkc6fli3vfm15nmcnq/rorefoz.pdfIn PDF document text
    • https://agenciaboom.com/wp-content/plugins/super-forms/uploads/php/files/g5tcof667jo6mq3aaki489u2d4/79761287188.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbb8784a919---fifetijubebizu.pdfIn PDF document text
    • https://finestblogger.de/wp-content/plugins/super-forms/uploads/php/files/kqu6i6lqdu32cp2s5u8neoh0kh/difotemifovanakizow.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/fbe8vul0h15op9q8no3mctqgl6/zipiridal.pdfIn PDF document text
    • http://gw73patriots.com/clients/1/1e/1ed986c9d410becccfd9995a8318e329/File/divefuxur.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011db8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB8 8736 bytes
SHA-256: 09a5215938b7f483d14bd19f22ba824cbf5b535bd91701997be7691678cdff21
font_01_sfnt_off00013abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ABF 5484 bytes
SHA-256: 260b5bd11013e2925831eb07efcde10628c0729729127bffd1bcf90ad033e129
font_02_sfnt_off00014d50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D50 11348 bytes
SHA-256: 19cae33837d5106f61d456c8084b6efe6b79fea9760f36b67164727d13819f1d
font_03_sfnt_off0001742a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1742A 18128 bytes
SHA-256: d7dffc9c82ba9304674f1cd2e41f8ef0156cd9a48de85cabf436750b340dd517

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