Malicious PDF — malware analysis report

Static analysis result for SHA-256 9909c46608d6d1e4…

MALICIOUS

PDF

71.4 KB Created: 2021-09-25 07:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3cfb57e0b9cd872ae275d49b6b85d822 SHA-1: de0a1e97119b11e6df525d1442e201e69602c41c SHA-256: 9909c46608d6d1e47daf05a30f0723dd7e96a36f0acd0385711c6c1c6fe4bd16
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and flagged by an ML classifier. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to potentially malicious content. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • 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 https://chcial.ru/uplcv?utm_term=android+tv+call+of+duty+mobile PDF link annotation
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145163c60073---zilekesomigamejuke.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f86c57de3e---4039348.pdfIn PDF document text
    • https://www.luthier-auxerre.fr/ckfinder/userfiles/files/nenepokotejatenor.pdfIn PDF document text
    • http://haokunchem.cn/upload/files/xuwijuru.pdfIn PDF document text
    • http://kfnmsz.com/upfolder/e/files/20210921180757.pdfIn PDF document text
    • http://gruaszarate.com/ckfinder/userfiles/files/vozekifukikokekida.pdfIn PDF document text
    • http://screen.by/images/file/dedozipuxafafanezele.pdfIn PDF document text
    • http://duetsepolno.pl/userfiles/file/52967055004.pdfIn PDF document text
    • http://utcsp2.rustyramone.com/uploads/files/rerajuxu.pdfIn PDF document text
    • https://manorhair.com/uploads/files/202109181034279510.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/movelenadobagejozodidogov.pdfIn PDF document text
    • http://westhollywood.ilovepokebar.com/uploads/files/71802249512.pdfIn PDF document text
    • http://indecomavo.pl/userimg/inc/75182846609.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/46463678609.pdfIn PDF document text
    • http://veiligheidssloten.nl/ckfinder/userfiles/files/lovinupirogonowevax.pdfIn PDF document text
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/18164743208.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/42690661560.pdfIn PDF document text
    • http://studiolegaletrotta.eu/userfiles/files/76460221304.pdfIn PDF document text
    • https://bda.ch/ckfinder/userfiles/files/javekadamigufikapidadiwam.pdfIn PDF document text
    • http://artvideo74.ru/upfiles/files/simapa.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/zakotogek.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/f4947e01b4e79933bdea029ddde6d519/38361245185.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613dde9be54c3---94900464960.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/d4691ec18ff621327bb63f6a5d3b0c61/xirubabakar.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_off0000b241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB241 10868 bytes
SHA-256: 01f813256310a898da24b491938dded63c5aaf7e0bafccc06ad4d4146337fb22
font_01_sfnt_off0000cb66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB66 17456 bytes
SHA-256: 490327bfe746b38d98039ecbd44cb590ff2fa52f96835a65244cbf0a55400185
font_02_sfnt_off0000f847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF847 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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