Malicious PDF — malware analysis report

Static analysis result for SHA-256 1be72831daa78bd1…

MALICIOUS

PDF

80.4 KB Created: 2021-06-22 23:11:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: c595fc459c2864ecc91c7176905b0f68 SHA-1: dde3938e0aa4248d7d1c4ddf2371011fdd860f64 SHA-256: 1be72831daa78bd154426135312373eb4c165d4ff0fbb33bcf941d35048b20a6
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8403

Heuristics 5

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://www.burit.net/wp-content/plugins/formcraft/file-upload/server/content/files/1608556dc78885---53889160703.pdf In PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/f8167d4611f7de5daf9f23b5bfe4240c/6923314869.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1608e6c08abf3c---63785288404.pdfIn PDF document text
    • https://studiopros.com/userfiles/file/In PDF document text
    • https://criteriacambio.com.br/wp-content/plugins/super-forms/uploads/php/files/lqk15accre5ojuolm6md737oma/fokorepaxorosapetuxilu.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/dbedb5b8a60715591abdd44dbdef80eb/nugedigizoned.pdfIn PDF document text
    • http://immobilieninvestors.eu/userfiles/file/litojakudewujepi.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac2f9482395---lujamumuwik.pdfIn PDF document text
    • http://personnelstrategies.net/userfiles/file/99839714702.pdfIn PDF document text
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/8922404b7212581418cf6e449d23beb0/5995305746.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/sh5hcr5fp27n48reu2otc9o752/lubewevezolotikirawa.pdfIn PDF document text
    • http://lookupagency.es/wp-content/plugins/formcraft/file-upload/server/content/files/1606ee347aca91---todotijadopag.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16099eb521058a---47935034546.pdfIn PDF document text
    • https://idfusionllc.com/wp-content/plugins/super-forms/uploads/php/files/9cea3411c34016d7c286fdcbc8a37c2f/damex.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/52da75ff4803ece4d402fb8c4ddec2af/fovomeja.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070583159ae7---47079620406.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=s460+headphones+manualPDF link annotation
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AA 7936 bytes
SHA-256: 5337b1f224d410e0f72c002d7ac5261a27609f901938a41615bb96e56c4dcb64
font_01_sfnt_off00010229.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10229 5592 bytes
SHA-256: 655f9af7cc52013f59d7f1cb23a51dfb60e111eee316c2bf50781c97313683e0
font_02_sfnt_off000114fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114FE 3744 bytes
SHA-256: 7039ddba809ba784c3aa62f7f54e5addf45e1a6994b7c4a939dfaa60476ca4dd

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