Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbba76c5965eeb41…

MALICIOUS

PDF

40.8 KB Created: 2021-09-06 06:17:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-23
MD5: fe9770858e2c4ca4a781873ba3f942b1 SHA-1: 3ad7d04599633372ebf0b8878a3a2b1205548ef2 SHA-256: cbba76c5965eeb41a1bf5cc6e9a7e840acd76af2fe7c001a28a40f4fd2919fbe
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

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

Machine Learning

  • Nyx PDF Classifier malicious score 0.8310

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 40 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://avela.md/userfiles/file/75563473019.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/457bf5993bd370145ea3861b1e0fff94/78054528399.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/28487296544.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/nurabi.pdfIn PDF document text
    • http://keralabiblesociety.com/fck_uploads/file/77166547958.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/0d9886c50ecd9d34ed2b40da89ec0e19/lanejenoromodumotuju.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075fc40976ad---6767351215.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/6afve60blq7l2j4k0knqfav1a3/kalajatefowuzumijifisulu.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16108f05e90b9e---26881191427.pdfIn PDF document text
    • http://starlightcelebrates.org/clients/4/43/43e9139217482d7666ce300faf566241/File/fivij.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/9622e4ba2acb1be463c264d2e6017a4c/dinufufusodukezijagitov.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/9gnmvmikff9hhaahvogp09a870/dagogoroso.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d4156cc0665---74359245485.pdfIn PDF document text
    • http://halaljones.com/uploads/files/58503904291.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/4684fd2b1ede6dacde0bc1845fcdad1a/gutusetipolezabifimus.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/lowakebu.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609630ea397dd---wavogino.pdfIn PDF document text
    • http://roycraft.ca/userfiles/file/35602951516.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/pibif.pdfIn PDF document text
    • http://prvugkh.ru/uploads/files/junawosuduwizisajuzeve.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e51ac9342---82133581938.pdfIn PDF document text
    • http://jakebenmd.com/clients/0/0e/0eef9d569b11303d075d19626cc6f958/File/sobuzeza.pdfIn PDF document text
    • https://101doctor.com/uploads/ckfiles/files/60cIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=just+in+time+production+project+report+pdfPDF link annotation

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