Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36fa92e3dc47a5d…

MALICIOUS

PDF

83.5 KB Created: 2021-09-13 18:59:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 883cc3f11d907c0a885625e6199f2680 SHA-1: f4e55e190141b304b9a4dc18f60f9c089be700fb SHA-256: d36fa92e3dc47a5d6d30e75b902d09c377a271f7fd11de831fea8014ce4141d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains an embedded JavaScript stream and multiple external URIs, many of which point to compromised CMS uploads or disposable hosting. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using numerous links on disposable domains, likely to obscure malicious activity. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to deliver a second-stage payload or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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 http://laskod.hu/userfiles/file/gajezifafodimarixil.pdf In PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/5751e036af0fbb6af7cb05d32ed941a6/98443162682.pdfIn PDF document text
    • https://lokmangal.co.in/wp-content/plugins/super-forms/uploads/php/files/b044b453551bcb908f703424a9d22e0a/petodix.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/rofeji.pdfIn PDF document text
    • http://www.mariabeckmann.com/fotos/uploads/files/lowuvot.pdfIn PDF document text
    • https://hgb.se/filer/file/33052487549.pdfIn PDF document text
    • http://serting.eu/userfiles/files/xudopuwamigudepebesumudag.pdfIn PDF document text
    • https://lemonsport.sk/upload/file/66984000193.pdfIn PDF document text
    • http://www.ekoforte.com/upload/file/vuzopiledibe.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210907035616.pdfIn PDF document text
    • http://silesiacapital.eu/data/file/4875989818.pdfIn PDF document text
    • http://kondicionery-vidnoe.ru/upload_picture/file/97204576682.pdfIn PDF document text
    • https://proartgaleria.hu/files/files/forewubiputaxuveguxisari.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630615371.pdfIn PDF document text
    • http://smenergy.kr/uploaded/file/1683872155612fef3d225bc.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/80180ed9569228b59ef164744ab86b5e/63390404978.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/44543836894.pdfIn PDF document text
    • http://actinq.nl/upload/file/sinujenitepinabe.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/lasad.pdfIn PDF document text
    • http://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613337af85b3a---gajuwomuvuwitaresugu.pdfIn PDF document text
    • http://hkbroadwin.com/userfiles/kesosojatixefoze.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/2140016465.pdfIn PDF document text
    • https://cpc-serbia.org/js/files/dewiwujili.pdfIn PDF document text
    • https://sportsslife.net/upload/ckfinder/files/47452080597.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/wizov.pdfIn PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c149875498---7985791938.pdfIn PDF document text
    • https://semsaesp.com/ckfinder/userfiles/files/44441036653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=samsung+themes+free+download+apkPDF 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_off0000dd26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD26 18796 bytes
SHA-256: bb0f38d8e62a48bff94fb8ef05cddd2ffced117ff76d4938e41b518a3cadf6d4
font_01_sfnt_off00010dc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DC 11208 bytes
SHA-256: 7d01edfaa677659a18b5b4e625c66cdc91fa20122f84571bac40f964bc52bd00