Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f39f309a89ca010…

MALICIOUS

PDF

51.2 KB Created: 2021-09-26 03:54:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1cdd51dc6aa5bb33ce5731978fcb4922 SHA-1: ac77a6fc08fc426cda6a6b60fd0c3bc7e6aa4ae8 SHA-256: 6f39f309a89ca0107317f5b1a9f564ad41120560746bf7bef49753713ae8bdd7
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm with numerous URLs pointing to external sites, many of which are hosted on compromised WordPress installations or disposable domains, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8920

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 http://costruzionibulagna.it/userfiles/files/lezimonigawoxodasod.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138387ed2c99---zigaxifa.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c3d8bcf4ecfede1f060819cb96eccbaa/gupunos.pdf
    • http://cukiernia-waltar.pl/qcms/userfiles/file/zovenozakedanodekug.pdf
    • http://krr-nfe.com/suratnfe/UserFiles/File/55832450585.pdf
    • http://iweldbot.com/ckfinder/pho/files/97464302327.pdf
    • http://sangtaoad.com/uploads/userfiles/file/dedanasutasusurugemenexo.pdf
    • http://metabolit-plus.ru/files/file/sigupujorijef.pdf
    • https://tyko.pl/userfiles/file/79774486917.pdf
    • http://ceresasrl.it/userfiles/files/pabuzebuk.pdf
    • http://llux.vn/uploads/files/59779501741.pdf
    • http://dobermanncz.eu/files/piwoxoge.pdf
    • http://bukhatirhomes.com/userfiles/file/kereduvegizenexilujupiwe.pdf
    • http://mbfeed.vn/upload/files/95254441419.pdf
    • http://dialog-seversk.ru/jsplugins/ckfinder/userfiles/files/52033259325.pdf
    • https://trainova.com/userfiles/file/beguximolokazo.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613cdef6a248c---50153616760.pdf
    • http://jiehuist.com/userfiles/files/48457491689.pdf
    • http://axi-hohenstein.de/userfiles/file/82504263468.pdf
    • http://sincaremedicaltour.com/js/upload/7123270966.pdf
    • https://aristi-trap.com/upload/users/files/92899756766.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=turn+on+mtp+mode+android
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000afa2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAFA2 16792 bytes

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