Malicious PDF — malware analysis report

Static analysis result for SHA-256 383c5a9d892d8cdc…

MALICIOUS

PDF

89.5 KB Created: 2021-07-08 20:14:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b01fe6b850d378c48c67541e0897d801 SHA-1: fa2c6d3406f44bb3db0302d61ab36142f53bc341 SHA-256: 383c5a9d892d8cdc4ca26ed8cf4313e68d7a0f3a38431292bff4fe8c4b5e3e51
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious content. The heuristics indicate that the PDF acts as a link farm, directing users to multiple compromised websites and disposable hosting domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 https://irlanc.ru/uplcv?utm_term=misclassification+of+employees+as+independent+contractors
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/9740cadc24eca0aba4659479110bc03b/64983851775.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/mv340i6mu4oeeue94k00h7si8o/99457396304.pdf
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae44149219c---73844766266.pdf
    • http://autoset66.ru/admin/ckfinder/userfiles/files/3078325469.pdf
    • http://sola-brothers.com/userfiles/file/sajepum.pdf
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606eee73c154f---50300076776.pdf
    • https://augsburger-dartliga.de/uploads/file/wosezugavaxapoxuxebetebof.pdf
    • http://metalltechnik-kutschi.at/filuxafigukub.pdf
    • http://grandp.ru/userfiles/file/16104768978.pdf
    • http://creative-format.com/upload/editor/files/71599053502.pdf
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/zururotuxakebinokapi.pdf
    • http://logiccpacma.com/ckfinder/userfiles/files/93094167844.pdf
    • http://vanxuantravel.com/upload/files/95888997267.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5f68db5f8---zozamawebibuz.pdf
    • http://alhs1973.com/clients/64426/File/rogewagagisekokoru.pdf
    • http://lalitas-thaimassage-spa.de/wp-content/plugins/formcraft/file-upload/server/content/files/160892f905d6ca---wewujopemutidagokirikole.pdf
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/pk40kcpng6t81h7vqvjqo9p0vi/74600703520.pdf
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160757164570b3---piloxuwurezeratedusawojil.pdf
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/trnqn5oj6b7v0kb8rmtokjpoqp/lidafufijifunije.pdf
    • http://qiuyutv.com/userfiles/files/20210704014350.pdf
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607438a82d985---33107438012.pdf
    • http://ucity68.com/clients/e/ea/ea220da86df44fb0ae3b7c8e8295ccc1/File/45276145829.pdf
    • https://agatanorek.com/files/file/litobemakalokabonekutofu.pdf
    • http://nail-free.com/ckfinder/userfiles/files/nowujumanixijetitesos.pdf
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a6e77984fc---kidokixugalodi.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb39.bin
c08d7f11db45d5d824e252ee9f0afe690753dbe3f5a2632326d9ab4759673017
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB39 10888 bytes
font_01_sfnt_off0001146d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1146D 16792 bytes
font_02_sfnt_off00012c7f.bin
aaabef26302582547dbc4e9d9b2a0619434a2ba76505ebe31bdfa7278ebb457f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C7F 16708 bytes