Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cde066c16cc3ed…

MALICIOUS

PDF

73.0 KB Created: 2021-09-05 23:38:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a3b9885e347cb7c5adcf761314c5ac99 SHA-1: e4764f33a3ca3dfa9bf9bc7cfb4392927113e1c2 SHA-256: 12cde066c16cc3edd8f93a372f23acc1f4d78f2674aae16adc8e12c12bc75f19
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate that this PDF is likely used to distribute phishing lures or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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.
  • 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://drafthe.ru/uplcv?utm_term=dandelions+eve+bunting+pdf
    • http://tavaszitura.eu/userfiles/files/61327434235.pdf
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/4034474960.pdf
    • http://broadgatecapital.com/userfiles/file/popanenatape.pdf
    • https://mps-india.com/userfiles/files/1303824992.pdf
    • http://anhuishangbiao.com/upload_fck/file/2021-5-12/20210512101915707953.pdf
    • http://dolekkoyum.com/admin/UserFiles/file/27535169845.pdf
    • http://giasuminhtam.com/Images_upload/files/29913845792.pdf
    • http://orkoien.com/userfiles/files/74389839255.pdf
    • http://msamericapageant.com/clients/873634/File/73542857035.pdf
    • http://guowangcable.com/d/files/jutegul.pdf
    • http://susanirvine.com/clients/82887/File/togozij.pdf
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/ocf1ka19ve3qg4ab010u763elg/67176786077.pdf
    • http://phdpecs.hu/userfiles/files/xufurolevukojubilu.pdf
    • http://alnoorcity.com/userfiles/file/87891357747.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609540b2110d9---15560563717.pdf
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/d302fgr50iae627svjs061igm1/tokalola.pdf
    • http://ranaghatpchsschool.org/userfiles/file/liwesidugerovasidutajofij.pdf
    • http://la-roofers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4d14e5cd4b---90101481691.pdf
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087f63c181ee---tobovitosedevarolo.pdf
    • http://dblbtech.com/userfiles/file/35547980822.pdf
    • https://larrialdiak.es/files/galeria/files/vagazugajotupebuvamori.pdf
    • http://guidesdugrandlarge.fr/images/import/file/nozonubabamufavid.pdf
    • http://worthingtonpark101.com/userimages/78727901130.pdf
    • 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_off0000bb4c.bin
b1a5a586c7adb64c1996429d633c01329376b0bcce9ac1936b69e2bec72543af		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB4C 16352 bytes
font_01_sfnt_off0000e5b0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 16792 bytes
font_02_sfnt_off0000fdc7.bin
102c1f4491f379a1d6b1d72de325a50b7267fe34a4a1bc35b3b61d2285a7e23c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC7 10880 bytes

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