Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d78a1c9960aa91b…

MALICIOUS

PDF

83.4 KB Created: 2021-09-12 18:22:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f30fc4e8be99164b6d0a6fb9ba37de5d SHA-1: be1c42e4de40cb0028fd3697ddd105e91ef52dc3 SHA-256: 9d78a1c9960aa91b065e2889839adbd5457c716b296f4bdb51f9b565d8f5f80d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains embedded JavaScript and numerous external links, many of which point to compromised websites or disposable hosting. The presence of embedded JavaScript and the nature of the URLs suggest an attempt to redirect the user to a malicious site or download a secondary payload, likely disguised as a software download. The ClamAV detection and ML classifier further support its malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=download+google+chrome+browser+for+android+tv PDF link annotation
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/48a49e8102f26f38d24b9f56737547d5/50931566761.pdfIn PDF document text
    • http://esoftland.com/userfiles/file/74699493146.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/juxulanefijorosefe.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/27698285375.pdfIn PDF document text
    • http://putzlappenborner.at/editor_up/fisupubixubojutovilutijud.pdfIn PDF document text
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/5f7e1401df307aca40249cb324a848ff/24361946251.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/5711757367.pdfIn PDF document text
    • http://fitviewer.biz/files/file/nasozozobusogalopon.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130209bed087---munegakafevenadu.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/vumefimam.pdfIn PDF document text
    • http://2017.letnifestiwal.pl/ckfinder/userfiles/files/suxajebapesujezujisinoj.pdfIn PDF document text
    • https://tigaintan.com/contents/files/30810815476.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/16138a04a5d22f---68099346666.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/selob.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613115a89582c---kepir.pdfIn PDF document text
    • http://galettedesrois.eu/userfiles/file/674270793.pdfIn PDF document text
    • http://fk-fudosan.1nino3.com/app/webroot/img/userfiles/files/37583717377.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/73136365321.pdfIn PDF document text
    • http://ux02.wadhost.com/js/ckfinder/userfiles/files/fapujagaripoxipunugov.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/339912fc7021c4cebbeff551038452f1/3700028648.pdfIn PDF document text
    • http://kdwatch.net/upload/files/2021091215461062.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/20903517167.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/pubapamix.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_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 17812 bytes
SHA-256: 7ea01c4921af9fb80179fc78eaab4e69277e09829d1df63a012695d7201dd3e7
font_01_sfnt_off00010d66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D66 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001257d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1257D 11216 bytes
SHA-256: 8ae0e85705bb537e2d57f0932d023c3d83fcdd3ab4cfad830c3bd4604f0bf4c1

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