Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef840e80c8bb855c…

MALICIOUS

PDF

73.4 KB Created: 2021-09-18 09:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 0f08fd42d2bd5cb1ffada86fca52f560 SHA-1: e327e90c4ba3c106691893015201e25b34707219 SHA-256: ef840e80c8bb855c12105ac6d175c2ae6ff54e0119910845740af8cb3a84c6cf
132 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URLs, many of which point to compromised websites or disposable hosting. The embedded JavaScript likely facilitates the redirection to these malicious sites, which are characteristic of phishing or malware distribution campaigns. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier suspicious score 0.4750

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
  • 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://pixomot.ru/uplcv?utm_term=launcher+for+tablet PDF link annotation
    • https://global-brand.net/userfiles/files/fuvovonosikenu.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/zubuwubafuwifazesilagik.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/miwivadujemuwabotiz.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/xired.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16137fe50676c4---midibizaxifetufijuvogoz.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/4aa0e0e5d310567539d04eb83ba1458b/47892878440.pdfIn PDF document text
    • https://sanipro.ma/app/webroot/uploaderfiles/9139265648.pdfIn PDF document text
    • http://emaaravm.net/upload/files/17961190081.pdfIn PDF document text
    • http://mega-stainlesssteel.com/uploads/image/files/mafifolebizipaxisutab.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/31124309338.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021982337247670.pdfIn PDF document text
    • https://derey.nl/app/webroot/files/userfiles/files/35577438956.pdfIn PDF document text
    • http://smart.sut.ac.th/tsme/src/lib/ckfinder/userfiles/files/muzopiligep.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/32563912973.pdfIn PDF document text
    • https://anesaportugal.org/upload/file/54340741424.pdfIn PDF document text
    • http://belgium-ex.com/images/blog/file/37265024973.pdfIn PDF document text
    • http://josepholszowka.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/puravaroranugipepanoro.pdfIn PDF document text
    • http://kant21.com/userData/board/file/63105946638.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/43218545526.pdfIn PDF document text
    • http://mos-craciun-inchiriere.ro/fckfiles/file/89806140501.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/07541d653fb7ae55ebe2f70e52a739ce/48012983233.pdfIn PDF document text
    • http://budropol.de/Upload/file/11698923720.pdfIn PDF document text
    • http://gorod-r.com/userfiles/file/dukisibize.pdfIn PDF document text
    • http://studiocalcinoni.com/userfiles/files/kidunopi.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_off0000d600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD600 17424 bytes
SHA-256: 2c7420638e6a486642dbbdc56c14b5280f41630f48e6c492db00f65563044647
font_01_sfnt_off00010371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10371 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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