Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6b7c9e2ebacd282…

MALICIOUS

PDF

68.8 KB Created: 2021-09-27 21:53:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 113361b624216c3de64a7b371ef5e000 SHA-1: 6ace5c9d938a9ac871da8c2eb4bb90e353c788b4 SHA-256: c6b7c9e2ebacd28215b81cff432fb429f7e6cc62e93051565fc0249ad652966a
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 executing malicious code. It also features a link farm pointing to external PDF files hosted on compromised WordPress sites and other disposable domains, 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 0.9965

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 http://fskyok.com/uploadfile/files/6239820768.pdf In PDF document text
    • http://cualuoiskydoor.com/webroot/img/files/gakuwelasoxuwododoli.pdfIn PDF document text
    • https://ateneoarbonaida.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c555a1f7e---84408157462.pdfIn PDF document text
    • https://jills.reviewz.eu/app/webroot/files/userfiles/files/jubusigaxilenijuxubija.pdfIn PDF document text
    • https://artesapanaderia.xyz/aym_image/files/41512711075.pdfIn PDF document text
    • http://www.prctech-th.com/ckfinder/userfiles/files/11711411346.pdfIn PDF document text
    • http://choinka4x4.org/cms/files/file/xaxuzutumeral.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/ea42ae5f68f637b9a0d1df48d261f745/15135637085.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/59712267133.pdfIn PDF document text
    • http://yangpupark.com/uploadfile/files/82364921514.pdfIn PDF document text
    • http://bascobrunswick.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613d853bc4b5e---saxiwubakibabafevubu.pdfIn PDF document text
    • http://hoanhaochemical.com/uploads/files/dupiwivudijolenalufefe.pdfIn PDF document text
    • http://eaupureinternational.com/userfiles/file/jipikoronoz.pdfIn PDF document text
    • http://cngwalk.com/fckeditor/userfiles/image/molokuremazawumevi.pdfIn PDF document text
    • https://braindevelopmentmaps.org/userfiles/files/bodafigasosupovi.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/sabuvenibutavavul.pdfIn PDF document text
    • http://legalinet.eu/userfiles/files/zotebarosopogetenebelu.pdfIn PDF document text
    • http://az-volnycas.cz/volnycas/fckphotos/file/sarafisowipixalobewijuj.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/todojezinaranasibofujasu.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/52732835405.pdfIn PDF document text
    • https://bliznacite.com/files/mofunezutanajufabodaxo.pdfIn PDF document text
    • http://abwhopewell.com/uploads/files/givokogitif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=novel+super+psycho+love+pdfPDF 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_off0000adfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADFB 10520 bytes
SHA-256: fe092a7a038d8dbbc0f55b115980f87c0a6d94e696a320b7da0260cc6e63ed58
font_01_sfnt_off0000c625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC625 15620 bytes
SHA-256: 0eac5064cfcebab9b425e547e0ba40406df422d4b456c0f202e57001ceeea2f9
font_02_sfnt_off0000edee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDEE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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