Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c899584f68ed44a…

MALICIOUS

PDF

78.6 KB Created: 2021-09-11 23:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 425d1a5e08480f654f97392398d951e0 SHA-1: aa5e8abf9f0f9305e51182bb0ae080627017cae2 SHA-256: 5c899584f68ed44aba475506b32d9a0dc0c9003f872acadd6fa9a59cc6563ac6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded JavaScript is likely used to facilitate the redirection to these malicious links, which are designed to trick users into downloading further payloads or providing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 7

  • 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.
  • 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://knupress.com/pds/editor/file/14314586807.pdf In PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/85311865418.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/dogabegoguloxemubavaz.pdfIn PDF document text
    • https://energooptima.hu/upload/File/68878510032.pdfIn PDF document text
    • http://www.radeton-cz.vasestranky.cz/ckfinder/userfiles/files/33280382726.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/fubinoredomefidizow.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0302b9830---58786017141.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c7b59ec79---viwobebuvenuweko.pdfIn PDF document text
    • http://orderbestwings.com/uploads/files/nunalemadijadigegedivipol.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/13306800857.pdfIn PDF document text
    • http://ropesadventure.com/d/files/zukakudanumalabakanuj.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/fug6rbb3p120lrrejc0f1bhf3d/75769413857.pdfIn PDF document text
    • http://faizleathergloves.com/userfiles/files/77234865651.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/161305fded856f---17809683485.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161399a05ceac1---maxevakonibezanikogufegus.pdfIn PDF document text
    • http://195exim.com/datas/files/70457389936.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/gexuxojo.pdfIn PDF document text
    • https://flims.atelierleuthold.ch/userfiles/files/todosofurutapejatetuwemen.pdfIn PDF document text
    • http://tavio.su/files/file/vimowufagetukir.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/99073811071.pdfIn PDF document text
    • https://www.mercedesbenzofaustinservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137379711f2b---katokegow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=8+ball+pool+shot+hackPDF 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_off0000d1bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CE 16996 bytes
SHA-256: bbd1e17f5275320fbd807668fd4c5dde128ec9aae9e286fabb5c4f6fb58e28e5
font_02_sfnt_off000115da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115DA 10384 bytes
SHA-256: ed2babd711b812c566ef335ee6e0bfdc999cb708814647f101b91f8ad3182585

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