Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8efbe6ed1c87afc…

MALICIOUS

PDF

79.4 KB Created: 2021-09-01 01:12:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 62c7450ffe3510b77aec1df92b3775da SHA-1: 8b005078d4a05ee62e4c7a61eed8ab62e23241f1 SHA-256: c8efbe6ed1c87afcd607ad6cea7e514d190e9643b6b36825269f9fee6372081e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to distribute links to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://oniceh.ru/uplcv?utm_term=pdf+to+word+converter+download+pc PDF link annotation
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/3b182d78eff0b68017fccc35916699f9/21042044839.pdfIn PDF document text
    • http://thanhlapcongtykiengiang.com/upload/ck/files/jugirixesozu.pdfIn PDF document text
    • https://burmesecatclub.nz/wp-content/plugins/super-forms/uploads/php/files/894106e287acd4d3c13beddf50811b58/nunukarebogebalotamej.pdfIn PDF document text
    • https://taechoclub.com/FileData/ckfinder/files/20210811_3C5ECC614667A7D8.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/tozizelebeta.pdfIn PDF document text
    • https://arhometutor.com/userfiles/file/bejufipuminozitapove.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/jokijugeniwijos.pdfIn PDF document text
    • http://xn--80aaaaadfwa5aftjhxrkcrg8iwc.xn--p1ai/pict/file/gagusi.pdfIn PDF document text
    • https://higher-reason.com/wp-content/plugins/super-forms/uploads/php/files/fipgdjt5q36sji22g5lt2sf71j/32354739100.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/furokufukazes.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160945b8f73013---ledexamuvosa.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/6135209548.pdfIn PDF document text
    • https://muzeumkonstancina.pl/attachments/file/96376646125.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/eaf56b59de9a47be94d4fae731b94adb/14833837775.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/14958712325.pdfIn PDF document text
    • https://dotcomtravelegypt.com/userfiles/files/96058447135.pdfIn PDF document text
    • https://wasael.com/userfiles/file/40177833211.pdfIn PDF document text
    • https://nikken-engineer.jp/export/sd205/www/jp/r/e/gmoserver/8/6/sd0748886/nikken-engineer.jp/fckeditor/upload/file/83015600726.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/37143074d91c2cd164e5f45cb61d5fa8/36216770923.pdfIn PDF document text
    • http://ramayafaith.net/clients/64268/File/resuderizisom.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/64c0beb6ed3880a852ece50ca6d5c07a/vasaxoredakonugajeze.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/27919700589.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_off0000d390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD390 17088 bytes
SHA-256: 828eabfb69e7dc1924213546e7d3e8f96238a6f1a6f7bc039edf4a8a8b541da4
font_01_sfnt_off0000ffd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD8 10508 bytes
SHA-256: 51b52fdfa16ccffbc8663acd4c35f0cb5f6c6f75dd5d2fa5ae2f7ff022f35675
font_02_sfnt_off000117f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.