Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a69d5c8d42379da…

MALICIOUS

PDF

84.5 KB Created: 2021-07-03 01:23:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 8451825d8ab23748747ea240bcb456fc SHA-1: 6f853424ad5246446efdea5b83e5c33c8d5d9f77 SHA-256: 4a69d5c8d42379da6ba76f838ce570e08c524ede5438c4d4865deca117a1939c
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.2676

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 http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/160beed2f6c6b2---39976027848.pdf In PDF document text
    • http://mientaytourist.com/uploads/files/nadefuvudizediwutubafipat.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1608ca76e539e1---41902619079.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0ac6e7dbfcecccba854e961560b9eb1/37802682541.pdfIn PDF document text
    • http://jatyn.cn/upfiles/202105/file/1621880898.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160add9bc806dd---70631218427.pdfIn PDF document text
    • http://www.associatedomains.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076126db51b9---4162520468.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/h18t6i0kkt9qn5raieedhcqblg/nirefivujudozef.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c49eacb688f---gewowofulopa.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e67a0e069---zojejebetopugol.pdfIn PDF document text
    • http://pokorny-podlahy.cz/UserFiles/File/tovowugevup.pdfIn PDF document text
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3c6c36740---62902898133.pdfIn PDF document text
    • http://qytbearing.com/upfile/file/lulotaver.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/160b24b218002e---mejafivuninukugo.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/2d1fa8f610cf8ffce1179bc859fd2177/budoxazo.pdfIn PDF document text
    • https://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608041282d0e9---kelelugijutakolitofer.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16070b9b75dda0---lemunirawowovu.pdfIn PDF document text
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0c70abef23---jafatot.pdfIn PDF document text
    • https://hafa-verein.de/wp-content/plugins/super-forms/uploads/php/files/7f2256b3d8c580b607547d95267089ec/tukekovuvusaluxalugowuto.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/fodiridimafonijat.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/xelazoramesasipelo.pdfIn PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/nbetdsurl3gc5a9iu86quok5c2/1051874243.pdfIn PDF document text
    • https://www.northwoodmedical.ca/wp-content/plugins/super-forms/uploads/php/files/oloon55a0i0m1m8oslalctu5mi/sibejazikapirijadafenovi.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608bf574b9728---mofuwopoto.pdfIn PDF document text
    • http://emirates-offshore.com/uploads/image/file/79025583025.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=patton+qualitative+research+and+evaluation+methods+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160980f7e99e5c---gufazawugitadobi.pdfIn PDF document text
    • 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_off000105b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105B6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011dcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCD 11196 bytes
SHA-256: 4b7e0344f9ce06c27fbc35930cbcee11cab6b1a010082834a893eef15f9c44e3

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