Malicious PDF — malware analysis report

Static analysis result for SHA-256 852386897e316e14…

MALICIOUS

PDF

93.0 KB Created: 2021-08-21 14:23:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a85d0e6764b6c44e56ff2f33c6e85c6e SHA-1: 31a03a7481b555033e83aed49356b4803ade4434 SHA-256: 852386897e316e145f22ffc2798020bd3d87e63f8aefc0968e669c075725ea40
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for delivering malicious content. Multiple heuristics indicate the PDF acts as a link farm, pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to distribute further malware or conduct phishing. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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 http://lev-steklo.ru/userfiles/file/29489608128.pdf In PDF document text
    • https://advancedcheckcashadvance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae869545745---koxeg.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/37740967003.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160921f6843cfe---winatitiliwepoker.pdfIn PDF document text
    • https://leganordavigliana.it/uploads/file/vurijaxu.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/filalufenufavetosig.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/dna0nq5qbdplf595d8v2fo6tr4/zajipevetozukelifewadezu.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f2f5ba453e---tagijimow.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/16082789333daa---nirubefatorug.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/45237619483.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d9f05ad3d95---fumavadixarunowodubufana.pdfIn PDF document text
    • http://www.gaviprintpack.com/wp-content/plugins/formcraft/file-upload/server/content/files/160730493520b8---jagegebavufitafo.pdfIn PDF document text
    • http://garantc.ru/userfiles/file/dafuxinulowilaw.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/revuza.pdfIn PDF document text
    • http://klefmarken.se/upload/file/jilaraxokovaxuruxa.pdfIn PDF document text
    • https://bancodevida.com/bancodevida/admin/images/image/file/rawowufufarovu.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a10705072453966c76f7dfb20a458743/908508768.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7faee61605---31843063014.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1606cb9590f022---67711618430.pdfIn PDF document text
    • https://sacc-la-chaux-de-fonds.ch/fichiers/file/ritedirenawisomufuforak.pdfIn PDF document text
    • https://inchiriereelicoptere.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16088f16f6ea37---65678999309.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/db4c56182cdddad6b5ca88db77347619/miwiwovosafudot.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=manual+dsm+5+completoPDF link annotation
    • 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_off000106db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106DB 10712 bytes
SHA-256: c3cbfae36e0294b32aab3e5dedb3b503883c3954c7ee958651e93749654eb71e
font_01_sfnt_off00011f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F82 17400 bytes
SHA-256: 5ae23c4a00a075079e28fd4e8f021e67b84f235acb4c1430555af3818d006f66
font_02_sfnt_off00014c12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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