Malicious PDF — malware analysis report

Static analysis result for SHA-256 5afadbd14620f89b…

MALICIOUS

PDF

83.0 KB Created: 2021-07-20 03:42:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 579a5a310f20ead6192e6f20a8b15e1c SHA-1: c44ab689d979a2b4a3c3277a26a5a3c441964b46 SHA-256: 5afadbd14620f89bb119d2a55a9365a45ab9f74460c759a1d08a328af6fad44a
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. It functions as a link farm, directing users to multiple external URLs hosted on potentially compromised WordPress sites. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, suggesting an attempt to obscure the true malicious infrastructure. While no scripts were explicitly extracted, the nature of link farms in PDFs often involves JavaScript to redirect users, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://probeg2000.ru/files/userfiles/files/65493801267.pdf In PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607153a742b56---23519320814.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/345afc1f3f84782340b7476f7d9c07fd/gagixitade.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/8iv65d5bb93vj0l9v8tirhdkvs/11209529703.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608980354cfa5---27065651024.pdfIn PDF document text
    • https://medius.sk/userfiles/file/97477025683.pdfIn PDF document text
    • http://www.heksan.com.pl/file/ziwisalanufugu.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3606509b6---82683732507.pdfIn PDF document text
    • http://profesniprukaz.cz/ckfinder/userfiles/files/debamamikevegodojixav.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/79785716751.pdfIn PDF document text
    • https://grand-forge.ru/wp-content/plugins/super-forms/uploads/php/files/ea0b82469bd86f997c349263cae0e625/85853448345.pdfIn PDF document text
    • http://chukgoobok.com/files/fckeditor/file/58611761277.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8377cf554---52788161111.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/1407425f182bef907398ce9ee9ae5146/xupivosibidoga.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae74e429b02---nufetepinusu.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/16087b891b8a02---13120160363.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/85300306473.pdfIn PDF document text
    • http://club-integra.ru/userfiles/file/nolusujejesekuzabupigetej.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/99ccf3a1aaccf93b1a1286976b177af4/95032199234.pdfIn PDF document text
    • http://ahsaipu.com/v15/Upload/file/202154847424174.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609874a6d87e2---96289899457.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/dbfad7a3f317c7ff8d0c8b30a167af01/6330148908.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57693c303---87342555578.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=muthu+hd+video+songs+downloadPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e48b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE48B 16236 bytes
SHA-256: bd2cb1ee02a8181348a8bd672f7e119ba43dc84f37554b37fdd0262af202ad86
font_01_sfnt_off00010ec0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 10672 bytes
SHA-256: c22b46d1f42b03c748bb927a3a67cbffe6a7ee24aa59ac58ae624bff75685d1d
font_02_sfnt_off00012707.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12707 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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