Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8f19c380cb0d74b…

MALICIOUS

PDF

76.4 KB Created: 2021-09-21 05:17:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b5b7159e2f65d412097bee01fd75aea SHA-1: a368c11d4ac85edf1f82dfab8123acdeceddbdc7 SHA-256: a8f19c380cb0d74b246aae23b0e4ac5f3c7a10f8029e6a3feabd0904e3dbf10b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous links to external websites, many of which are hosted on compromised or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or redirecting users to malicious content. The presence of embedded JavaScript suggests an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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
  • 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://yuanfuconstruction.com/ckfinder/upload/files/muxijalo.pdf
    • http://eaupureinternational.com/userfiles/file/89681601289.pdf
    • http://rockycheng.com/ckfinder/userfiles/files/vabezepogotetadoku.pdf
    • http://frigotechreina.com/userfiles/files/53128714840.pdf
    • http://superfishinglewood.com/uploads/files/fogukiv.pdf
    • http://baheth24cars.com/ckfinder/userfiles/files/taduwosikavetite.pdf
    • http://quangcaosms.org/media/ftp/file/kowuzive.pdf
    • http://ovecollection.com/royal/admin/images/products/file/80073492949.pdf
    • http://winteringlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/10169753677.pdf
    • https://austdoorcaocap.com/upload/files/3928089024.pdf
    • http://svb-volleyball.de/userfiles/file/nujigizidobonovenumuru.pdf
    • http://duepassidalcentro.it/userfiles/files/37336302672.pdf
    • http://ventilyatsia-v-sochi.ru/ckfinder/userfiles/files/42066344273.pdf
    • https://pu-sk.com/app/templates/js/ckfinder/userfiles/files/16652884494.pdf
    • https://ms02bet.com/contents/files/gakitatavipuwa.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/3a56a77096a8cd4851810f3476f9e540/nuxorilozemanubugomemod.pdf
    • http://herodumpsterrental.com/wp-content/plugins/super-forms/uploads/php/files/68c24c9223a1ea3b3fdfe99908b76ce7/50452606998.pdf
    • https://angelsforwarriors.org/userfiles/files/vupinezatogenuju.pdf
    • http://tomgiongvip.com/uploads/files/file/wazabuwuwuzoguwemekoxetix.pdf
    • https://normec-cm.com/ckfinder/userfiles/files/32942975691.pdf
    • https://lekkermooi.nl/userfiles/file/kibewuwosewigenufaxa.pdf
    • http://ajtoablakcentrum.com/_user/file/kilegowisiwuxolakumat.pdf
    • https://binarbaidtrading.com/public_html/userfiles/file/teziwabidowesutazudodob.pdf
    • https://www.superioreagle.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405a2460f91---30680246402.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=words+that+start+with+c+and+end+with+z
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c85f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC85F 16792 bytes
font_01_sfnt_off0000e076.bin
d5be7897190fabaabc98f7a4394c37a38e9198e0162c5aa2404d5be69cc75e2f
pdf-font-stream PDF embedded font (sfnt) at offset 0xE076 10560 bytes
font_02_sfnt_off0000f899.bin
90e8394beed5cee1f57f26b9923c1906d1cfa709d92bcc2d3c872dedc83df38e
pdf-font-stream PDF embedded font (sfnt) at offset 0xF899 16788 bytes