Malicious PDF — malware analysis report

Static analysis result for SHA-256 c95b059ace67a683…

MALICIOUS

PDF

104.2 KB Created: 2021-08-08 05:59:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e8d4efe82faf6669cbe6f3dd05515c1a SHA-1: a101f6a34e3defdb32af867fb186e1a3f83ac7cc SHA-256: c95b059ace67a6830d9d16ad6edd8db695eb11ce43139718691677087a031af6
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to compromised WordPress sites, suggesting a phishing or malware distribution attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely directs users to download a password-protected archive, a common tactic to bypass security scans. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/2f3bc2d03e94cbb96d2acab91377cc91/xowevugibomikomakoxeboket.pdf In PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/15158950471.pdfIn PDF document text
    • https://empirepin.com/calisma2/files/uploads/puwapexuvorabavivodu.pdfIn PDF document text
    • https://banghenails.com/upload/file/runofunevoterozaziburape.pdfIn PDF document text
    • http://realcomfort.ru/content/upload/file/bulagadoga.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/39269971715.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161096764e102d---laligiditinolizazanubenej.pdfIn PDF document text
    • https://brod-plovdiv.com/images/lolamitezaki.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/6d8875d6267142667d16f9268f0a48f8/52377376205.pdfIn PDF document text
    • http://www.lugashotel.com/data/editorfile/78194593065.pdfIn PDF document text
    • https://kurek-rowery.pl/user_pict/file/mufidina.pdfIn PDF document text
    • http://tmtechvn.com/webroot/img/files/dipuxemesiwegere.pdfIn PDF document text
    • https://www.mobytec.com.br/mobytec/wp-content/plugins/formcraft/file-upload/server/content/files/160f570fe65d4f---62454430592.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/53b55ea913d1494191642b43a03c5f86/91636023822.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/befapewofuleziresofit.pdfIn PDF document text
    • https://nguyenvanhuongloc.vn/app/webroot/files/images/pages/files/38194671715.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/25524507128.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079f75b4a3f2---44637852137.pdfIn PDF document text
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16081bb654b533---vumezebe.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202107091808008188.pdfIn PDF document text
    • http://brandweeramsterdamamstellanden.nl/userfiles/file/zagogosavupomopuxejami.pdfIn PDF document text
    • https://omomediacion.com/wp-content/plugins/super-forms/uploads/php/files/156c928bf696f2a8508ba691391007cd/jonuki.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cafa1c2fab---7397455701.pdfIn PDF document text
    • https://ajitcoatings.com/uploads/wesexij.pdfIn PDF document text
    • https://natyabio.com/uploadfiles/94949975838.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=generador+de+cuentas+netflix+diciembre+2019PDF 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_off00012ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB5 19644 bytes
SHA-256: adde87d2bb5d6d01cd4b60716ab66b89b4c8fd38ddb3613c616b112dacae213c
font_01_sfnt_off00015d67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001757e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1757E 11480 bytes
SHA-256: 48136f3370d00d9860479bd144cbb034aaaa24cb44739d8d73d165d9aa942e87

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