Malicious PDF — malware analysis report

Static analysis result for SHA-256 789c4ec037c6f80d…

MALICIOUS

PDF

77.0 KB Created: 2021-09-07 07:28:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 4c97ff40ccef8e9bb3d92bf79e6c592d SHA-1: 4a3804ce6df7a86e375ee8ab177ebc1d1c532a3b SHA-256: 789c4ec037c6f80db8c365a4efaa26d8cbb447997148dc402c95f42896718d22
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous external URIs and link farm heuristics pointing to potentially compromised websites, suggesting a phishing or malware distribution lure. Embedded JavaScript streams are also present, which could be used to further exploit the user or download additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://inwebjor.ru/uplcv?utm_term=protokol+kyoto+indonesia+pdf PDF link annotation
    • http://tomei4x4.jp/js/upload/files/95110022569.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/bibubezexeboxuxizaw.pdfIn PDF document text
    • https://fibra-optica.ro/ckfinder/userfiles/files/nogonorimuzejanenelot.pdfIn PDF document text
    • http://93564497.com/userfiles/21756655825.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/dajuvejobotuxezejowolar.pdfIn PDF document text
    • https://konchris.com/userfiles/file/1630883656.pdfIn PDF document text
    • https://faceless.me/userfiles/files/20843434222.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607961fe1d327---88603123754.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/6c3f4f15f9997b00703bf4a22b606f32/zuwexuzi.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/rhuq8uhefcvbn4mmfve100g5mm/xipuvirokote.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/986em1dhfvgvftn6doh7736e51/81774517108.pdfIn PDF document text
    • http://profil-metall.de/content/uploads/file/zojalinivubegavakekuzexu.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/akll095dts0s8v79u9pql22urg/35845816617.pdfIn PDF document text
    • https://kodcomputers.ro/2664/uploads/jixeloludesalewadoko.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/fc54ae2f9d7694f3a13c16b18f238f1d/103960339.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160ac1fbaaee82---81415622116.pdfIn PDF document text
    • http://scottsdalehighbeavers1978.com/clients/80197/File/44611182997.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/hvv3o8o9vmg1qvnhglikskp0e6/vozeruretenutatexalaxus.pdfIn PDF document text
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1608e80d2b14f7---65549315845.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/1umjgf0h7qeka31lggvkbe57p5/luzevivasoru.pdfIn PDF document text
    • http://centreforeffectivecoaching.com/media/file/telabitozolonekoforu.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/20580410696.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/14782299106.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_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 17460 bytes
SHA-256: d874d1b667200679eb3c7c74dfd1c7004d45552872be87c68520250cdc4ec258
font_01_sfnt_off0000f54f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF54F 10696 bytes
SHA-256: a2d3d698ccc970b5820931e2228e6a33fc8b231e2c3eb7e8321a6151629ec8e3
font_02_sfnt_off00010e01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.