Malicious PDF — malware analysis report

Static analysis result for SHA-256 902b775a7a993666…

MALICIOUS

PDF

62.6 KB Created: 2021-09-26 18:18:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5be387c10d89d06eb794240c56f63686 SHA-1: c34c708a9c937322ecba618769d0fda44ff5d665 SHA-256: 902b775a7a993666cebcaa893772c6a135040aca3b7ffdbdf242f35889a82918
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript, which is a common technique for executing malicious code or redirecting users. The PDF also includes numerous external URIs, many of which point to compromised WordPress sites, suggesting a link farm or phishing lure. The presence of JavaScript and external links indicates an attempt to download further payloads or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8412

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/02aba4a772e2211f2da2a0948c192cd9/87909512201.pdf In PDF document text
    • https://whereestar.com/marinarubicon/admin/file/90160045881.pdfIn PDF document text
    • https://miminku3.com/contents/files/zidokevekifu.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134da2caf188---16276835060.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/xerugadogedalozetalurema.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/29594683667.pdfIn PDF document text
    • http://someteme.com/archivos/_20210902011706.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/88925547466.pdfIn PDF document text
    • http://dienlanhtruongson.com/upload/files/75856494094.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/51051692679.pdfIn PDF document text
    • http://dxqzx.com/ckfinder/userfiles/files/20210910_200206.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/xitebufabepuwobopulid.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/10342309623.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/63479461675.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142001237f1c---nedabuno.pdfIn PDF document text
    • https://jimsdelibrookhaven.com/demo/jimsdeli/admin/userfilesfile/zologewela.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/11432562969.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/93840170139.pdfIn PDF document text
    • https://safarekhoob.ir/basefile/safarekhoobir/files/belivekivaxabuwubir.pdfIn PDF document text
    • http://rockycheng.com/ckfinder/userfiles/files/23117715600.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/51098976416.pdfIn PDF document text
    • https://ebal.ro/app/webroot/files/userfiles/files/rejomirufidulebokuf.pdfIn PDF document text
    • http://biosystech.com/pdsFck/file/15714824854.pdfIn PDF document text
    • http://rivucota.com/upload/files/nipegatozajegufad.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/39721941884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=avp+evolution+android+downloadPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB12 19668 bytes
SHA-256: e18166323e1e4c72733e3584b4d067a08b6465d9c6f96614ce0e88305020a06d

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