Malicious PDF — malware analysis report

Static analysis result for SHA-256 4459313ec69c73b4…

MALICIOUS

PDF

71.6 KB Created: 2021-07-01 09:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 0bddd0da6f43a87bba94ded1cf088bbd SHA-1: 7b2113aaf3195f203b30574db0e88aee27f3bb8c SHA-256: 4459313ec69c73b450bec07472e9a234c5e6df48b0a37fdbfab2031049ada9c9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. The presence of multiple link farm heuristics and numerous extracted URLs, many pointing to compromised WordPress uploads or disposable hosting, strongly suggests a phishing or malware distribution attempt. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.europesolidaire.eu/userfiles/files/mejibiliji.pdf In PDF document text
    • http://botosani.ro/img/uploads/file/baxug.pdfIn PDF document text
    • https://reaga.net/js/ckfinder/userfiles/files/59300656376.pdfIn PDF document text
    • http://wirheiraten.de/images/file/1645723675.pdfIn PDF document text
    • http://apricomm.com/userData/board/file/tazufifililelelitaderu.pdfIn PDF document text
    • http://catgarner.com/clients/873270/File/sumagalokuwofivagimugafeb.pdfIn PDF document text
    • https://www.reachcast.ca/wp-content/plugins/super-forms/uploads/php/files/e2e0802e6c7aef7bf76919a2e0b4778e/burodilulojat.pdfIn PDF document text
    • https://aneri12.cz/res/file/15788364040.pdfIn PDF document text
    • https://faktxeber.ru/resimler/files/gajilasisutezifalulini.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b839aec6397039f43ac85af6e1c2ce12/nuniganutovo.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d637b007fd---81295551721.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/zekigagomiduronum.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f58fa9b407---tadiruliguvozofuzinuwujez.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a894617c47---45637651503.pdfIn PDF document text
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3331b65f4---91016493026.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607710de024e9---29868039714.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/kipakirobenatokedorivo.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b63e72703dd---donibifi.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/d47u19orgcp2s6s3sk3dg2dkb0/nixoxigadivisejejugu.pdfIn PDF document text
    • http://mtsp.by/userfiles/files/nuzaxubumomez.pdfIn PDF document text
    • http://zge-led.com/luodan/images/userfiles/file/sosetexoxurejeremubu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=resting+and+vestingPDF 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_off0000b99e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB99E 10268 bytes
SHA-256: 2dbe7d8e2f1a1bb4a834b734736ede8e0895c906fc659e802c3be9247e4913d5
font_01_sfnt_off0000d0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AA 15904 bytes
SHA-256: 5185c3dcf2faf09cea97e4b85db75ec8eec059af5d5e7f69e7422538c2202a70
font_02_sfnt_off0000f995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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