Malicious PDF — malware analysis report

Static analysis result for SHA-256 72c23283341d23ea…

MALICIOUS

PDF

81.5 KB Created: 2021-09-06 18:24:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 7e7d591a85eb9e9bd888d4a47cda0f72 SHA-1: 3cacbbbd301746cbe5f3086aa33639f796867e58 SHA-256: 72c23283341d23ea2d443bd673a569bfa3000dd6b5623c8150c957dc833e51aa
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • 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
  • 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://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bda89b5e813---35852633701.pdf In PDF document text
    • https://aprenda-atdi.com/uploads/files/85560737254.pdfIn PDF document text
    • http://kaies.cn/upfiles/210819214047925728bts1zg.pdfIn PDF document text
    • http://www.holzbau-hoelzl.at/wp-content/plugins/formcraft/file-upload/server/content/files/161269e8cc2b23---22316501189.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a18e44cacd3---zelimeralib.pdfIn PDF document text
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/9891a1f53905e685cf5a5b831771606a/dejez.pdfIn PDF document text
    • http://grupophi.es/uploads/files/20151784570.pdfIn PDF document text
    • http://jngf.cn/files/file/17944975611.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/timujaxasefefum.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b599791d71b---potomex.pdfIn PDF document text
    • https://themalc.org/files/file/napadituvivo.pdfIn PDF document text
    • http://abwva.com/uploads/files/zigebetujutajadogavunuga.pdfIn PDF document text
    • http://soles2walk.cz/data/file/73411489056.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/8rh8dfl1luth0sl1al57hctiut/46443810257.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/lebefilijabimabugarod.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/tutesezebebubop.pdfIn PDF document text
    • http://berbun.com/user_img/file/42143695079.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210726_A4EABB798C807307.pdfIn PDF document text
    • http://thesecurityguardunion.ca/userfiles/files/77155065069.pdfIn PDF document text
    • http://adice-area.com/pictures/files/bakolevowamimorulofinapud.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/rixof.pdfIn PDF document text
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607392ce7a1aa---71460950145.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16078b9e8438ca---26113281143.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d43ff465cf---wadawagigofedelakak.pdfIn PDF document text
    • http://debden.org/userfiles/file/fezegapafazuvusurinelita.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=respuesta+metabolica+al+trauma+2018+pdfPDF 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_off0000d834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD834 11464 bytes
SHA-256: bf96cdfab3b9e040bf49ca99c33c17bab7c81801432bc4516b64b125218b15dc
font_01_sfnt_off0000f331.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF331 17728 bytes
SHA-256: 0229f2fe578ffed4dc81b9b13d8e9bf02dd3dc610c084c0e7b705dc7f93ae287
font_02_sfnt_off00011fe2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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