Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f2d036707bba778…

MALICIOUS

PDF

81.0 KB Created: 2021-08-11 02:05:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b1b73268af56d342f18ba702e3f5b996 SHA-1: 4729ebb41f3f7d918cd8a9ffbfc63a829bb74635 SHA-256: 4f2d036707bba778f47c242fe55d2786fe7a9e9fb201acecc23fc2be481f2328
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to multiple external URLs, some hosted on compromised CMS platforms. The presence of numerous links with UTM parameters suggests an attempt at SEO manipulation or phishing, rather than delivering a direct payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://synerhu.ru/uplcv?utm_term=gilmour+rectangular+sprinkler+instructions PDF link annotation
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/1c86cc8e8c9a760d7960b53d9260cd27/50487159285.pdfIn PDF document text
    • http://linza-market.ru/upload/files/89407523528.pdfIn PDF document text
    • https://llsindia.in/FCKeditor/file/nakitomikigeju.pdfIn PDF document text
    • https://desertflying.club/wp-content/plugins/formcraft/file-upload/server/content/files/160948310489d8---nexulijonezigoxizasepap.pdfIn PDF document text
    • http://makingtheturngolf.com/clients/9/92/925d9bae4ecf380f28dbe0e1390c16eb/File/lawunoramomima.pdfIn PDF document text
    • http://refta-bg.com/userfiles/file/41649079199.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608726ecd37e8---9842772481.pdfIn PDF document text
    • https://alarouba.com/ckfinder/userfiles/files/32808638317.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/1607af186560a7---19945339607.pdfIn PDF document text
    • http://brette-animation.com/userfiles/file/pasan.pdfIn PDF document text
    • https://mujeresenmovimientoplus.com/userfiles/file/wesubafanegumibukaneta.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-8-6/20210806211135843675.pdfIn PDF document text
    • http://php-lounge.de/userfiles/file/77012220407.pdfIn PDF document text
    • http://bpabv.nl/uploadfiles/file/29298686375.pdfIn PDF document text
    • https://www.brightfieldbusinesshub.co.uk/wp-content/plugins/super-forms/uploads/php/files/n8t29vrplpug1k8upl13juver8/xufududakopu.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/5degktmhfmhk9mcr5r2rahbkm4/50338653589.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/zumezewatofisaje.pdfIn PDF document text
    • http://qianlong99.org/ckfinder/userfiles/files/18525765261.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/a8723994fdf8c9d75eefad2883d9574a/vigivizeronosexuwosid.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/88213647451.pdfIn PDF document text
    • https://facades-et-traditions.com/actualites/file/29610967210.pdfIn PDF document text
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b17dd95631c---93996659496.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_off0000d98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD98B 10948 bytes
SHA-256: 12921d9d745352a890ab7c2914920c4d1e843976a08a9ca9a6abbd5c6105588a
font_01_sfnt_off0000f2e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E8 16648 bytes
SHA-256: eaf0451cfff4166b21ef22a2db14deb35c4aa65bef6c2c615f698aec5f637bd5
font_02_sfnt_off00011e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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