Malicious PDF — malware analysis report

Static analysis result for SHA-256 a95c0cad6aa00988…

MALICIOUS

PDF

85.7 KB Created: 2021-09-01 12:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e98321c16551caa3e214e281d2125e98 SHA-1: 9bab9420c64b77a10aedde1713f974c64ca4ea56 SHA-256: a95c0cad6aa00988362ec1ba738e12a11a0871aba2adce24209611de541a47f1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is classified as malicious by ML models and ClamAV, indicating it likely exploits a vulnerability or serves as a phishing lure. The document functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised CMS upload directories. The presence of these links suggests an attempt to redirect users to malicious sites, potentially for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 http://www.multigacos.com/admin/uploaded/fck/file/rixizodirat.pdf In PDF document text
    • https://zapcdn.space/web/img/podborky/files/nujenusowofemedojod.pdfIn PDF document text
    • http://sushrutproctology.org/ckfinder/userfiles/files/bilasam.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/zalokixibuwimedoxadomuf.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/d35c62b9f953c7803e20376de7c1f0b8/sakejobapa.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/fea0dff66f1c67e4444b192a8a7cf991/pureviborabamimifuzejataf.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/56036594855.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078a2b5352c4---fezojoxinutufevizagoti.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/52cad15e6d832605648b172b85b0e173/zuwedero.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-7-20/20210720232120272218.pdfIn PDF document text
    • https://aashianarealty.com/file/nopilujumizujonigidopa.pdfIn PDF document text
    • https://sancarspune.com/wp-content/plugins/super-forms/uploads/php/files/853b3b865fe6bbf1616bcfe61486dd35/zunegejemutozosipebi.pdfIn PDF document text
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/pvaocglm2rbvanlab6aclml8af/nelitoxofudaw.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/11700150271.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/160aacfd4b3987---wogukeninemebisume.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/kegogejororijo.pdfIn PDF document text
    • https://tabularasa.lv/sites/tabularasa/uploads/documents/files/poneduxubulidamabig.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/160dbb2a89a828---596816735.pdfIn PDF document text
    • http://www.netcorp.hu/data/editorfile/67476370606.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0ef23534e---50741876587.pdfIn PDF document text
    • http://xn--o79av69abka850ab6c.com/upload/file/202106201200487506.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=self+introduction+to+new+team+examplePDF 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_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 10976 bytes
SHA-256: 1940609db50dfa43b3e81b529688304ee7560f655eb3b2d8e5717b8b6b310c53
font_01_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 17652 bytes
SHA-256: 474c356148624f0f6f3ac1be1e7df82cd8c018aef52f961ec4df216ba2dd308f
font_02_sfnt_off000130bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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