Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f8cb2c1ea37631d…

MALICIOUS

PDF

70.4 KB Created: 2021-09-14 18:46:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b4b54a82c07253b9665fa251bb4930d5 SHA-1: 47f33cc71a073dc62a98edab11fbfd29af112b83 SHA-256: 9f8cb2c1ea37631dcc322472ebb4f4155e4fc7c735d7acd1d925c876225623e9
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file contains embedded JavaScript, which is a common technique for delivering malicious payloads. The heuristics indicate that the PDF acts as a link farm, directing users to various URLs, one of which is disguised as a 'flash player for androids free download' lure. This suggests an attempt to trick users into downloading and executing further malware. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://infrive.ru/uplcv?utm_term=flash+player+for+androids+free+download PDF link annotation
    • http://ladyqueen.it/userfiles/files/jiwilifikit.pdfIn PDF document text
    • http://tsnpharma.com/upload/files/ferudinetubepa.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/27279005392.pdfIn PDF document text
    • https://bahia-group.com/ckfinder/userfiles/files/79225961736.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/8510689466.pdfIn PDF document text
    • http://adgroup.co/userfiles/file/rotewu.pdfIn PDF document text
    • http://xaydunglenguyen.vn/upload/files/f37a1d.pdfIn PDF document text
    • http://fernandopelosini.it/userfiles/files/gimupizobutabop.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/xikemi.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2cd6ca01fe93cbb9ddcc38da1bf354c2/gomeziwamib.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/vugudijatem.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/mnva3h3i9hsklr918b656nl7cu/92631700762.pdfIn PDF document text
    • http://teen.plovdivweek.com/js/ckfinder/userfiles/files/48278340277.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/xifinodajuluwevexo.pdfIn PDF document text
    • https://globaltranslation.com/demo/global_translation/beta/userfiles/files/99318865372.pdfIn PDF document text
    • http://chinhsuasolieu.com/media/files/63846569090.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/35405804750.pdfIn PDF document text
    • http://www.gabrielamaciel.net/images/content/file/fereguletup.pdfIn PDF document text
    • http://www.bash.cl/media/file/967728213.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/gofib.pdfIn PDF document text
    • https://kamhosting.nl/ckfinder/userfiles/files/76148806037.pdfIn PDF document text
    • http://lambanghieuquangcaogiare.net/vietkiendo/upload/file/61404811451.pdfIn PDF document text
    • http://maschimaurizio.it/userfiles/files/14688972504.pdfIn PDF document text
    • https://www.scmsgroup.org/ckfinder/userfiles/files/13334519810.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135e586ed2ee---gedepesevasen.pdfIn PDF document text
    • http://www.asap-recruitment.net/upload/file/maxodokixi.pdfIn PDF document text
    • http://websteravelandscaping.com/editorData/file/wanerinoloribubozizokavuv.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_off0000b591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB591 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cda8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA8 10672 bytes
SHA-256: bbd8ffe027d707b868fafc5bab40b0d9f618a09691046220d54654b55e8b70e9
font_02_sfnt_off0000e610.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE610 14976 bytes
SHA-256: 1c969b9e47063f061e79704fcd8a0c9e541dba4b99dfad304123fb3cb6d79a69

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