Malicious PDF — malware analysis report

Static analysis result for SHA-256 24c89f0aad99888f…

MALICIOUS

PDF

70.5 KB Created: 2021-09-19 14:57:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d40b2b2855986c28791a4a8ba1d1539f SHA-1: de6d4dca0bf74b66e5263e79cf672065b9885d0f SHA-256: 24c89f0aad99888f3bd32765801d33f42b15ba261aa16cac9a87c6330ebd099a
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external websites, some hosted on compromised CMS platforms. The presence of numerous URLs suggests an attempt to distribute phishing content or further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://queure.ru/uplcv?utm_term=sad+animes+to+watch PDF link annotation
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/lizanugilun.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d2c5d62a9---difijigawenakitote.pdfIn PDF document text
    • http://etasystem.net/userfiles/files/wotuliwoj.pdfIn PDF document text
    • http://yuqiaohome.com/uploads/files/202109180027316029.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210914070311.pdfIn PDF document text
    • http://bennett-legal.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/lapovexelumev.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/3mvq04uo5q99o9qf5l3toaogli/78053435341.pdfIn PDF document text
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/1613a1f712a1cd---bijigemajekodaxoxigukazu.pdfIn PDF document text
    • http://8njl.com/userfiles/files/nofipejulofi.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/jetolojo.pdfIn PDF document text
    • http://epicridesnepal.com/files/muduzalamovomukogusofa.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/jorejuza.pdfIn PDF document text
    • http://modernplating.com/userfiles/file/5417326742.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/19905533441.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/luretetek.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/mikozibevu.pdfIn PDF document text
    • http://www.jamesbgriffinlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb926e108d---milowevotobalulapabazugof.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109071257252761.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/9ca9b0911dd08c805a1870b77cbb58e1/3182789659.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/97686649805.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/75319814646.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbfb12b20c---wufulorijajalalonij.pdfIn PDF document text
    • http://ogcdc.org/uploads/ck_upload/files/butenejugugenojor.pdfIn PDF document text
    • http://yuc-fac.com/uploadfiles/20210906205812.pdfIn PDF document text
    • 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_off0000b56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB56F 10648 bytes
SHA-256: c778a2b925b36848fcf0c811f17965fd1953c814757af6e612ce0b0cf28d5149
font_01_sfnt_off0000cdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDAD 15320 bytes
SHA-256: 454317ffdd5b5e72fb6c34a6456553378142f4aff5f653a4fe972492f6d89786
font_02_sfnt_off0000f49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF49C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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