Malicious PDF — malware analysis report

Static analysis result for SHA-256 97f1389a84c0544a…

MALICIOUS

PDF

74.6 KB Created: 2021-09-21 09:21:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: e3f35892a09e7b5cd1175d73e0c4a946 SHA-1: 1a73dacc76db23bf2696acc5530d311bf955ddae SHA-256: 97f1389a84c0544af4cd29748d6fce47ac004b7f5771605857736bf336ce6044
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and numerous external links, many pointing to compromised CMS uploads or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery via these links. The presence of embedded JavaScript suggests it may be used to obfuscate the links or perform further malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://smidgel.ru/uplcv?utm_term=top+firestick+movie+apps PDF link annotation
    • http://ykzn8.com/upfiles/editor/files/vasukozevagesenuvigalap.pdfIn PDF document text
    • https://yastudio.net/wp-content/plugins/super-forms/uploads/php/files/f52fb07b07d4006389e0833520789f8a/gugajutovoxuf.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/jetifovofomisedulamod.pdfIn PDF document text
    • https://toananhmedical.com/uploads/files/sexarivemisaxogavob.pdfIn PDF document text
    • https://botroul.be/uploads/14335430565.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/jenugoromasasumavu.pdfIn PDF document text
    • https://premium-house.uz/images/file/takibemeremixazatawu.pdfIn PDF document text
    • https://pharmnet.cz/ckfiles/files/files/4360886520.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/stdf3iamornp819udns9ke4jt4/luvegojokotaridoli.pdfIn PDF document text
    • http://pushgroup.lv/userfiles/files/18701437940.pdfIn PDF document text
    • http://punaide.com/userfiles/files/gukipesuzedivez.pdfIn PDF document text
    • https://www.rath-catering.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614262afc3812---21737434394.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/66630654582.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/apklpnn1em5k0mmsm9t6hh2dk4/wukadulutarife.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/0ukbo7qd9oc6788flk9dnh5e7m/39811670359.pdfIn PDF document text
    • http://etepi.pt/js/ckfinder/userfiles/files/ridanelogosi.pdfIn PDF document text
    • http://influences-vegetales.eu/assets/Image/files/dororevodonobiwajifuno.pdfIn PDF document text
    • http://longarmquiltacademy.com/fckeditor/userfiles/file/sopari.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/16144d51f01942---bumivaroruwugavixor.pdfIn PDF document text
    • https://clinicscrm.com/img/files/79651122734.pdfIn PDF document text
    • http://luatsugiadinhviet.com/upload/ck/files/gifasodovijetilutukesome.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/80631606267.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_off0000c058.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC058 16960 bytes
SHA-256: 86b0a8a5cc3315168c7c0aaf9bcef531115f9d5d299c9cdeb3df7bec83ea38b5
font_01_sfnt_off0000ec8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC8B 10612 bytes
SHA-256: 92ece5829c7d6bcff099b9d12cfc02a814ee39cd863c19349796ee10bf30bc5f
font_02_sfnt_off000104f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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