Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c052c2346e2bf96…

MALICIOUS

PDF

98.5 KB Created: 2021-09-02 17:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: d732d81936b0fdb893b0a5eca2982f39 SHA-1: 49ae40929ac91967805e3553e86a49fe27716861 SHA-256: 0c052c2346e2bf967c9d8814ef759ad002084276675358e6839a4b36b983a997
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF 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. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript may be used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://krisoc.ru/uplcv?utm_term=epicyclic+gear+train+nptel+pdf PDF link annotation
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a6c2d4267c2---6148455656.pdfIn PDF document text
    • http://bigsvatcharasith.com/userfiles/file/23329712923.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/27863667908.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081d04a4f9a2---40332706344.pdfIn PDF document text
    • https://ecoquimica.cl/dinamicos/uploads/file/sibupedafasosuwomolox.pdfIn PDF document text
    • https://dm288.com/slicice/file/xabelosoruzoni.pdfIn PDF document text
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/zaxasigawegabesi.pdfIn PDF document text
    • http://4bx.pl/public/file/23338528045.pdfIn PDF document text
    • https://www.criteriainvest.com.br/wp-content/plugins/super-forms/uploads/php/files/hudd9f9h1dp6nm9p1ie2ibop4g/63380329654.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/pefig.pdfIn PDF document text
    • http://teifsepahan.com/files/file/31715235988.pdfIn PDF document text
    • http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16079993dd328e---47446043557.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a2736f8323c---38400105969.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18b7295370---54572181436.pdfIn PDF document text
    • https://cambodiadriverservice.com/userfiles/file/92157886501.pdfIn PDF document text
    • https://colegiumaniucarei.ro/ckfinder/userfiles/files/fesiwupifanapober.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/87574631953.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/xapexonolegajudefonegivu.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/94642356294.pdfIn PDF document text
    • http://rotarylaspalmas.orgdocumentos/file/81653408992.pdfIn PDF document text
    • http://jentretiens.ch/uploadimage/35208935423.pdfIn PDF document text
    • http://garageanything.com/js/upload/files/94060009501.pdfIn PDF document text
    • http://koryosushi.com/uploads/files/79998773544.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607598023b36a---sagijebebexisovoxik.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

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_off000119f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119F6 10604 bytes
SHA-256: 9e3326a82d76d5957a757bdb0746a913735a6f8c2104997fea7f76aa70dd62da
font_01_sfnt_off00013223.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13223 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014a35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A35 18860 bytes
SHA-256: e2c2a5118e2518daf8712739e953e27154386da56dd842268824be3146187bab

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