Malicious PDF — malware analysis report

Static analysis result for SHA-256 654492a360a2d2e3…

MALICIOUS

PDF

79.3 KB Created: 2021-07-30 07:50:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d503149e933db18609268edeb40b0a67 SHA-1: edcb1b98114796d09e84effc38139f2d707ebf72 SHA-256: 654492a360a2d2e3c98303a813cf4657ebdb4a4fd6dcbec242653565565227e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The embedded URLs and the overall structure suggest an attempt to lure users to potentially malicious websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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://lyzebrno.cz/userfiles/file/51546967200.pdf In PDF document text
    • http://lalinpress.com/ckfinder/userfiles/files/53328481293.pdfIn PDF document text
    • http://daechienglishpark.com/ckfinder/userfiles/files/vifavivewegakoji.pdfIn PDF document text
    • https://faltprasten12.se/anvandarbilder/70/files/16352006406.pdfIn PDF document text
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1607c04baab4cb---weximorimomololorisarebi.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/90796623025.pdfIn PDF document text
    • https://www.mybizwebsites.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb77660261a---52906714630.pdfIn PDF document text
    • http://jimmartinfamilyreunion.com/clients/35696/File/26957216372.pdfIn PDF document text
    • http://fedoro.ru/upload/file/73371014821.pdfIn PDF document text
    • http://uco-kampen.com/media/files/jafopotaxomudozexaxob.pdfIn PDF document text
    • http://nousgarage.com/userfiles/file/ketusojaxejivoxenilufiw.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f8543cce0f---kasatot.pdfIn PDF document text
    • https://avela.md/userfiles/file/webutofasigoz.pdfIn PDF document text
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/pawufekolef.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d32b0d101998fb8880dc728784bf2dd1/17707740987.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/balapopolupotam.pdfIn PDF document text
    • http://ferrocom-spb.ru/userfiles/files/zotefowatemiwamo.pdfIn PDF document text
    • https://nanyangtextile.com/userfiles/file/bugilonixinur.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210619_E7E8FB9E856ED489.pdfIn PDF document text
    • https://airbays.com/userfiles/file/dozomusazisegojefufomuzul.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160828636c147b---ruviwabolozi.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160980667d9ec6---muxarimefovutur.pdfIn PDF document text
    • http://indecomavo.pl/inc/17825793522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=10.+s%C4%B1n%C4%B1f+palme+fizik+soru+bankas%C4%B1+cevap+anahtar%C4%B1PDF 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_off0000cb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB9B 11392 bytes
SHA-256: 27dc2704bfb5d63407e39c5b0462eccc509f6c6fc6c19fec05a1cd05f67040d3
font_01_sfnt_off0000e60c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE60C 18988 bytes
SHA-256: 81e18ce0956b8f811ee904aef360ad2541a885e40cf3564ac32097de74b7505b
font_02_sfnt_off000114bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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