Malicious PDF — malware analysis report

Static analysis result for SHA-256 3179f12ea04aae8f…

MALICIOUS

PDF

137.4 KB Created: 2021-06-21 03:07:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 96cf628372aa34841f03ae4877f6f3d7 SHA-1: 7ef8426567221b20df6a990c8f4b6b1692113fcd SHA-256: 3179f12ea04aae8f26fa288bf425a02a280069d023e88cb141b36a3dc4416c24
154 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The document body text, though partially garbled, suggests a lure related to 'Bno countersign form download'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8904

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 https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/32a517a9e319935d0963197386107d37/52646330241.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ae3fb2bf89---25901289528.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/33127867041.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/657c28337186b3ba25e2d43bf4336349/fodoz.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/f1023cae51ddb3f4fb9ab3c356d45d64/bazawotogezamamilafutuf.pdfIn PDF document text
    • http://thegroverestaurantnj.com/userfiles/files/85933075941.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210617212933.pdfIn PDF document text
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b78e72e7f96---susaluwizadesezafuferobif.pdfIn PDF document text
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16072503c6b6b1---sirejodufalugabovuza.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/7f7a6aaeef6ac6a165843fd266ce7a1b/rewuli.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/d95fde171e838kf1k7em1crda2/84390028772.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/d43f1bf68aaddc2076cb0de19509c3da/29581885368.pdfIn PDF document text
    • http://jp-photo.cz/soubory/files/mejabumivokolugafovomowi.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vixekogipililutikikitukap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bno+countersign+form+downloadPDF link annotation

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off0000de95.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xDE95 116534 bytes
SHA-256: 1a36ad4ea21cc8c69d82fc76a9dc0be8d19a871346a1f854db999bd426b00cf1

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