Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc3a6c3396f5124…

MALICIOUS

PDF

84.4 KB Created: 2021-07-02 04:12:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b3033b69d003acc25112a95677db15c SHA-1: f3f64248caad10b2005d1b4735fe842e8e1834d7 SHA-256: 9bc3a6c3396f51244924f5a802e22bb6476b2f5d85d821ba5beb9f2939be23be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan. It contains embedded JavaScript and numerous links pointing to compromised WordPress upload directories, suggesting an attempt to distribute malicious content or redirect users to phishing pages. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c285bb7130d---devunarugefegatege.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091ff4634030---xomeku.pdf
    • http://s-moonlight.com/CKEdit/upload/files/88566127305.pdf
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/9732d08fe8bab9b0668bf4b6fc5191fd/11747477137.pdf
    • http://akinmedical.com/uploads/file/tudapomuv.pdf
    • http://paintmaster.hu/js/ckfinder/userfiles/files/92870536039.pdf
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/u3tlhnvd4brsbgsbqsh3c4iof6/gasiwimaxuxalurafapuxutub.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160715b79465a6---guzutexajexurufowoliwo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/40843a18e4d02ae9a7249f568ca89d60/17819932235.pdf
    • http://newtrierreunion1962.com/clients/6/64/64567561842b0bbd40b956adda0282a7/File/18187278460.pdf
    • http://emailreceptionist.net/userfiles/file/58122680957.pdf
    • https://ppuhperspektywa.pl/files/edytor/file/8761614400.pdf
    • https://666666.vn/upload/fck/file/97440842769.pdf
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/xogub.pdf
    • http://singlesync.com/userfiles/file/94528089486.pdf
    • http://nw-line.ru/generic/uploaded/38331213530.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/isaplhaenjd9pivn8gbtlcq7u1/koranolilajusilew.pdf
    • http://zonweringbelgie.be/ckfinder/userfiles/files/59157185617.pdf
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160993397161e0---78339939099.pdf
    • http://zonweringbelgie.eu/ckfinder/userfiles/files/96440012440.pdf
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160aa5554d4c82---jawomobewoxubizezoti.pdf
    • http://mundori.com/js/ckfinder/userfiles/files/59816556436.pdf
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087f3447ae13---gakisepu.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=a+well+balanced+meal
    • 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_off0000e6d7.bin
8b8dc411b74fce94868f71c287cb9bba164a140fb7e00c0e7c293e196e6b1837
pdf-font-stream PDF embedded font (sfnt) at offset 0xE6D7 10160 bytes
font_01_sfnt_off0000fda0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA0 16792 bytes
font_02_sfnt_off000115b2.bin
86857b3eb768144728b9cece96b09f392560c4574aaf4d73bd7cf92a878329d4
pdf-font-stream PDF embedded font (sfnt) at offset 0x115B2 17840 bytes