Malicious PDF — malware analysis report

Static analysis result for SHA-256 83da5750ede70403…

MALICIOUS

PDF

85.0 KB Created: 2021-08-13 20:45:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: e9a46204537a159890f53fe864a89426 SHA-1: 39d6861afd4a46059241f2667e3bdbb4a5565075 SHA-256: 83da5750ede7040306002684c13c882d01b5d472a04a3658609377ac20909191
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 compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://abwingsmd.com/uploads/files/gejev.pdf In PDF document text
    • http://royalwedding.jp/images/blog//file/pezokavoguzovem.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/1a0bc1a3c729388766ba90429ac2c627/ranigoz.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/5745673004.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/96def60aad906030d0e0ddf3120aef64/64341486473.pdfIn PDF document text
    • http://www.ochoadentalcare.com/tacgestorcontenidos_ochoa/documentos/file/In PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096d5e7d1aad---povamileputep.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/pisojofe.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d2b8c3e026b---voxazilixavixunujeruxal.pdfIn PDF document text
    • https://clap-bas.com/userfiles/file/jolasite.pdfIn PDF document text
    • https://infypos.com/infyposcms/media/68525558523.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/77817614739.pdfIn PDF document text
    • http://hourinkan.net/js/upload/files/tidimobekinegalupipopex.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/53debcc89c795c02bc58a19cf4391d70/buledife.pdfIn PDF document text
    • http://vdadanang.vn/app/webroot/assets/files/78151771586.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/b2db27bcb27240e14e0eb9f66413b93c/46424557421.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/47379667306.pdfIn PDF document text
    • https://daynexweb.com/upload/ckfinder/files/xatajejoladogufibawabo.pdfIn PDF document text
    • https://championsforchildren.org/wp-content/plugins/super-forms/uploads/php/files/4c6b59a7b76ac885a015b041cbc945f9/bifovusoremapaxabu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4fb67e9ab---visizuwibij.pdfIn PDF document text
    • https://nepalipublisher.com/ckfinder/userfiles/files/vawowunawuzazaxuvidupabu.pdfIn PDF document text
    • https://pioneerlift.com/upfiles/editor/files/62409579540.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=uyire+movie+mp3+songs+free+download+starmusiqPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE686 11532 bytes
SHA-256: 521472c706722c1fe1bfa02c9adaa6cf0612d24c385bbb0959b918e6d867db97
font_01_sfnt_off0001016f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1016F 16936 bytes
SHA-256: 63b2b43c01ffa7f1ae2dabbfd1a2bf28f70cc6fc25b2beadae6c5762fe4c23b2
font_02_sfnt_off00012dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1