Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc227655c9716ad…

MALICIOUS

PDF

76.2 KB Created: 2021-09-13 13:17:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: aaa028f5255e7005a5b8c34f100b2f51 SHA-1: 01236428808075351f8783c835a3958de156b041 SHA-256: cfc227655c9716ad09b4eb7632f4a2f9c8450481e3bf198b273bd179a3e5efcd
196 Risk Score

Malware Insights

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

The sample is a PDF document detected as malicious by ClamAV and an ML classifier. It contains numerous links to external websites, many of which appear to be part of a link farm. A key heuristic indicates the document is a 'Browser extension / update installation lure,' suggesting it tricks users into installing malicious software. While no scripts were directly extracted, the presence of embedded URLs and the nature of the lure point towards a phishing or malware distribution attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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.
  • 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://pixomot.ru/uplcv?utm_term=forza+horizon+1+android+download PDF link annotation
    • https://gaadalagi.com/contents/files/tutedarilok.pdfIn PDF document text
    • http://xn--elementy-zczne-kwb98g.pl/media/file/37945075957.pdfIn PDF document text
    • http://citescolairedeledit.com/include/file/19753990568.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/funofixoxoxi.pdfIn PDF document text
    • http://orvositudasbazis.eu/images/upload/file/virutepa.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/13694604935.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/53663456890.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/witofikizerazodukeputuda.pdfIn PDF document text
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/d90c251f199c22af596cb591d1a2a349/waramipufotutus.pdfIn PDF document text
    • http://mywayrtk.org/userfiles/file/47980495259.pdfIn PDF document text
    • http://lecostationery.com/files/file/17963467978.pdfIn PDF document text
    • https://thucphamtruongxanh.com/Upload/files/juparaxuluvunap.pdfIn PDF document text
    • https://urbanlivin.lu/userfiles/files/25854616297.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/161370f9120de8---79627931276.pdfIn PDF document text
    • https://iagclaims.endataclaims.com/ModCoreFilesUploaded/file/zosuzenubesokoxidolumo.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/pilufofixowisiza.pdfIn PDF document text
    • http://sung1.com/upload/files/99819852475.pdfIn PDF document text
    • http://ubest.ru/images/file/70911173655.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/22434820048.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/c478703f0e185fe85a9ea9f4ffd4876c/sakazijakavevod.pdfIn PDF document text
    • https://lashmakerpro.it/wp-content/plugins/super-forms/uploads/php/files/pn3dj2d5gr2bpocg8hmquv9dt5/73751767516.pdfIn PDF document text
    • https://isabellepieman.com/userfiles/file/nuvezatipifa.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/13747848600.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_off0000c52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC52A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD3C 17848 bytes
SHA-256: 0d5850ff5aa0b3146e0f4520e75c75055e1994e949df8140aed4e1b221b3494b
font_02_sfnt_off00010b8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B8D 10124 bytes
SHA-256: c81f4031e694a864115018c9b744f16991c9afe9d642ab7f67f1db2ac029d5ae

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