Malicious PDF — malware analysis report

Static analysis result for SHA-256 a51696553c3cfb2e…

MALICIOUS

PDF

80.0 KB Created: 2021-09-04 05:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d0141586507670f5799631ef0efc806a SHA-1: 0271d3a4c7f98720f326624bbeda574a38ee4df1 SHA-256: a51696553c3cfb2e65366a36a3c0dbbd515e43b7dea2fe852f3373a54a436631
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or credential harvesting. The embedded JavaScript is likely responsible for redirecting the user to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://www.hagensmarketing.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089e6f793812---sumezifoletizugilinone.pdf
    • http://vitanova-cattery.com/upload/file/50896915149.pdf
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609733755f3e3---69483326200.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/5376f12a7933c08673a6602f31dd9d68/82676708866.pdf
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce841bd093b---mizuribase.pdf
    • http://augsburger-dartliga.de/uploads/file/15868990066.pdf
    • http://garage-ys.info/js/upload/files/48349084826.pdf
    • http://sea-cruise.ru/ckfinder/userfiles/files/bokeguxugati.pdf
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ef5bcb2c92---lujolubukitojevadokowib.pdf
    • http://amirafouad.com/uploaded_files/file/10697500405.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c17fd02e1e---jufozivulutaludebuwi.pdf
    • https://eventpro-kontraktorpameran.com/uploaded/files/47997426693.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/kmto8bsvg7l9n7sgpd9j32ncef/30011202408.pdf
    • https://zemiigori.com/uploads/file/fejotutiwi.pdf
    • http://boki.hu/editor_up/nuwemawemipitenibubiwimad.pdf
    • http://alburigiott.it/userfiles/files/sifamipiwek.pdf
    • https://systematix.pl/userfiles/file/16282738772.pdf
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0ae8cfc69---39851781108.pdf
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16079969f2b9de---terugawevi.pdf
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16087e8574eedf---josub.pdf
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/79e523ef0e358a8783a640c93e8dfc52/18889532885.pdf
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/78q4js2mvc5knae7v8hjenvqg9/laxigibatapimuzulov.pdf
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/d5e9c3fcf4a549ec65df159810368e67/26122236774.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=chilli+chicken+recipe+in+tamil+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_off0000d6c9.bin
0323eadfd7873c33aaed4c893a471af2e25b6bd28bdf8cd4c42edc5cc5b01915
pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C9 16656 bytes
font_01_sfnt_off00010215.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 16792 bytes
font_02_sfnt_off00011a2c.bin
664a47d7aec365a55a1add32fa3a6d30a335dfebb65b2305e8f7788cf2227f60
pdf-font-stream PDF embedded font (sfnt) at offset 0x11A2C 10720 bytes