Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f034be6db1c915b…

MALICIOUS

PDF

88.7 KB Created: 2021-06-14 07:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 754d8ccd9d03a9a1274d254ec16cb8e2 SHA-1: 6009c6baa82111cc88b57370e1f2f3494c8dacf7 SHA-256: 3f034be6db1c915b45f49aef200ed2692fa501265b8fa9c3a5337f152d2d2c74
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are likely used to redirect users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 https://smidgel.ru/uplcv?utm_term=signs+and+symbols+by+vladimir+nabokov+pdf
    • https://acrgroup.nl/userfiles/file/17553074465.pdf
    • https://www.xcelsus.de/wp-content/plugins/formcraft/file-upload/server/content/files/16091b807ee277---36984430855.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a95724ae746---66771227706.pdf
    • http://musorcentrum.hu/files/article/file/sisenileketusezaxefowobiz.pdf
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ba6aa8cb96---79533149687.pdf
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609304680d561---35475290883.pdf
    • https://a2designbg.com/userfiles/file/dezexop.pdf
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/57596fe1cf28f269643013abfc984d18/9658011321.pdf
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/993e961644f7f88b86f52f5ebf45b55e/pixavasugaduwu.pdf
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/pm0lct510tjtc32m6b5dkroru0/jopamidaba.pdf
    • https://www.electriclighting.com/wp-content/plugins/super-forms/uploads/php/files/baf6f8afc08deb78905f2123252bd640/24718599207.pdf
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/fufunevoge.pdf
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/9uo6ko5cbqjdpp8c9m9t3gpdv6/gelixozuvefu.pdf
    • http://anhuizpyy.com/upload_fck/file/2021-5-2/20210502152115736364.pdf
    • http://bitite.lv/media/txt/122/file/selezapovudunevo.pdf
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/vp51a42irf8b8vsuujvr24d3j6/dekurunilobite.pdf
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/jo3mqre4ou2stgmabfdoa9d8d1/mukexipigurab.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011c64.bin
2ae3a29606b3cb06ac25dcfaad65c6f484b9fefb5838a5cc101dc64c71ad0413		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 5828 bytes
font_01_sfnt_off00013031.bin
e33b565ffb0c2f1a573e49ca4c70051f0f21a1a1b27deecca8895ac2f56d352b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13031 11036 bytes

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