Malicious PDF — malware analysis report

Static analysis result for SHA-256 d670733315834843…

MALICIOUS

PDF

79.6 KB Created: 2021-08-21 06:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b3f734070be1b6da9bc68b8cd6abbf68 SHA-1: d8d77bae8d703c3409e0ae9bfe90ec8c82c9ffe5 SHA-256: d6707333158348433fc0fe5e81489977e71f9b36df8dc69befd4c0f5a3c6df14
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to websites that appear to be compromised CMS uploads, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the file being identified as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/54a7ec3f6e51a6627c0f96946bf5989a/10228799974.pdf In PDF document text
    • http://www.kymkarajok.net/tiedostot/files/86878471491.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e7e43aac4---79951368300.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/6313757905.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b48eb82ceb4---74192459359.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/nadokukewafotizafa.pdfIn PDF document text
    • http://mientrungpetrohotel.com/users/files/66042750755.pdfIn PDF document text
    • http://accronline.com/userfiles/file/sunarokuw.pdfIn PDF document text
    • http://an-ocn.ru/ckfinder/userfiles/files/kutefezodelugumolotu.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/3c25045da820a8f03de677c4c7bdfb12/33039700025.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087bef0ca95c---mudinovaxowoxiwefopa.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/wutinekumaris.pdfIn PDF document text
    • http://tasarimak.net/ckfinder/userfiles/files/tekobeni.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/2v00b8knh6i8ni08lrqm3465c6/14607907392.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a92f891bdd7---zutajekapotiwutejata.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/nujuneretok.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/99514767064.pdfIn PDF document text
    • http://cgt-fo-csc.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607658e6ba2fb---49922570525.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/4a0bd0df6d1cb630b298e52d623b8ad8/zadukujugagukaneve.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/1593597409.pdfIn PDF document text
    • http://goref.ru/files/file/99277932380.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/161067bfdc5769---9515673508.pdfIn PDF document text
    • https://www.llgnjinc.com/wp-content/plugins/super-forms/uploads/php/files/031ce2b01c455309151bf70fddae1f7d/xufabawozovow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=sentence+editing+worksheets+3rd+gradePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD492 11028 bytes
SHA-256: 6b9a3b9348546ebfb669c6f607d7afa4d44c50b37f93b722eef747ab2b1a3a4d
font_01_sfnt_off0000ee18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE18 16444 bytes
SHA-256: a9fa81547236bd2ba0001a06f9050898a7f734ec344d16d6af146b2720707ae2
font_02_sfnt_off000118cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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