Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2dc029d6bf65ab3…

MALICIOUS

PDF

69.5 KB Created: 2021-09-28 15:35:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef686fc494d0955b39612f0f3500473a SHA-1: 8805848b62e8b03a42789ba6bfd71ec33e1e0cd0 SHA-256: c2dc029d6bf65ab3a8bd6ebd1f2da9da5ef0ae67286aaf33f66c596f614bd943
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised WordPress sites, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of embedded JavaScript (T1059.007) suggests the document is designed to execute code, potentially to facilitate the redirection or download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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.
  • 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 http://bangladeshceramicsociety.com/uploads/editor/files/89002955640.pdf
    • https://turdv.ru/SITE/files/editor/file/leduvewazuridaf.pdf
    • https://partnermind.cz/images/files/kexedexixib.pdf
    • http://gdfsztal.com/uploadfile/files/ginukobunuzidizetejibuwol.pdf
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a3cec2db3---87516007917.pdf
    • https://flims.atelierleuthold.ch/userfiles/files/zajoxelon.pdf
    • http://engineersclasses4competition.com/files/others/nupito.pdf
    • http://wpklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/jikusexomir.pdf
    • https://xn--bren-mgenwil-gcbf.ch/sites/default/files/fck-uploads/file/21694776951.pdf
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614ad9789a83b---16341320153.pdf
    • https://pisangmanis.com/contents/files/wobetewasupinab.pdf
    • http://makaroma.fr/upload/file/75625219330.pdf
    • https://cafesca.mx/ckfinder/userfiles/files/sobosolodi.pdf
    • http://stcforanebanglore.smcim.com/www/js/ckfinder/userfiles/files/8605984220.pdf
    • http://xn--80aer5aza.xn--c1acndkmcarx.xn--p1ai/ckfinder/userfiles/files/21423899461.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/30739879875.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/r8qe4c1o6qephe25f0irc9dp20/selekarawugevutozufevakob.pdf
    • http://mijn-nederland.nl/userfiles/file/pefagavonerezewazadogaki.pdf
    • https://chowdhurytourism.com/ckfinder/userfiles/files/76429755274.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=android+to+pc+screen+share
    • 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_off0000ad47.bin
0c50fba8f9d53e21d78af7957b0fac0c546757fc1202575387d60e858437fd43
pdf-font-stream PDF embedded font (sfnt) at offset 0xAD47 10544 bytes
font_01_sfnt_off0000c543.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC543 16792 bytes
font_02_sfnt_off0000dd55.bin
2f57bdc083d0bc492484e07c09dcaa64fbd1f0b7fb19e2dccf30c12111de9e40
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 17128 bytes