Malicious PDF — malware analysis report

Static analysis result for SHA-256 8299be987e7f1e60…

MALICIOUS

PDF

71.6 KB Created: 2021-09-24 15:18:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1a3a18ed676c45e6d8e29e7830307147 SHA-1: 6b7e986a02ae899b6afc290e64c2b9fc4d5cf98f SHA-256: 8299be987e7f1e603fe6c4c3c24285c238f87d5035598d69834f437e8a509653
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features a link farm with numerous URLs hosted on disposable domains, likely intended to redirect users to phishing sites or download further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing and trojan activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=bad+guy+roblox+id+code PDF link annotation
    • http://tinavaron.com/ckfinder/userfiles/files/94216009125.pdfIn PDF document text
    • https://tsegypt.com/file/netibisufidodomuwomex.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/19720793693.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/xafaziviwipozexoterum.pdfIn PDF document text
    • https://zoldlaptop.hu/ckfinder/userfiles/files/32947652289.pdfIn PDF document text
    • https://shih-tzu.ro/files/file/97362935856.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/lomapewonagovuvudusimaf.pdfIn PDF document text
    • http://reklama-v-sochi.com/ckfinder/userfiles/files/23257225905.pdfIn PDF document text
    • http://medicapoland.pl/uploaded/file/19473640725.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614cd95e500f9---fotijetifosaz.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/7097445569.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/mofunomibeduw.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/14155190934.pdfIn PDF document text
    • http://tupnate.com/ckfinder/userfiles/files/miwabogipeseged.pdfIn PDF document text
    • http://ezclasssites.com/var/wwww/dev-ezclasssites-com/data/files/35789528372.pdfIn PDF document text
    • http://begues.mobi/userfiles/file/48779663872.pdfIn PDF document text
    • http://studiocalderini.it/userfiles/files/tiwaxivomule.pdfIn PDF document text
    • https://glass-haus.ru/wp-content/plugins/super-forms/uploads/php/files/39a3583c82711e71c94d61e25b885cd7/79506376205.pdfIn PDF document text
    • http://vasset.bg/userfiles/file/newakiwagulisojigikatuviv.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f4dba59454---66877185908.pdfIn PDF document text
    • https://rjpexport.com/files/metubenuzi.pdfIn PDF document text
    • https://perfecthospital.org/FCKeditor/file/76907414457.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/sabopo.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/vezedajawejoxufudibazokow.pdfIn PDF document text
    • http://www.memoriahistoricamalaga.org/ckfinder/userfiles/files/87998608323.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB523 10684 bytes
SHA-256: a5c185d0faa292f29609225d843733b4dd47f525bda34ea52f66ddacf520aa44
font_01_sfnt_off0000cd8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD8A 16976 bytes
SHA-256: 83183ad22c08de3479b71ee02d918accdddf463998c947b42f18dfca3d86e2b5
font_02_sfnt_off0000f8af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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