Malicious PDF — malware analysis report

Static analysis result for SHA-256 babb25961dd57dc6…

MALICIOUS

PDF

95.1 KB Created: 2021-07-29 12:57:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 2904489ebafe37b5a2e6277f349e2f1e SHA-1: 9f0b256b75f45443ab75d228d785c7c1d42f146f SHA-256: babb25961dd57dc65a5d970d90af17c51d2fd00edcf83a7173fcf70ce7e09ac8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many pointing to compromised WordPress sites, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://archism.ru/uplcv?utm_term=libros+cristianos+online+gratis+para+leer+sin+descargar PDF link annotation
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/6bf7502c8bca1230d2bd4f3cc0c16341/vatubigoko.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/fb19d10fd5ec9f043ab8bc474db30654/kesexubed.pdfIn PDF document text
    • https://churchosonline.com/wp-content/plugins/super-forms/uploads/php/files/f26ba2e6e8ffde210f9aecbf2d81a067/57754800780.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/2bdf7dab4d7f94709301e2cbec1cfb98/48965085999.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f66526afd7---91623911475.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/768894d4a6e546ed5c747cd1c7a8fff9/papodajanitadakubisuruv.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/d72fffnrfuqor6a5f971ij5lno/19507364166.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/lasojidudebomer.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd331d2070---gedotunulugamavidazuvabij.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e65f86775b---26825486682.pdfIn PDF document text
    • http://vinabomi.com/uploads/userfiles/file/totapebutaposefet.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160da13824f9ee---96904173541.pdfIn PDF document text
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/8478fb97972741e7fa476b36f2adccc6/kafaworagunapinixazozur.pdfIn PDF document text
    • http://fontanarosaserigrafia.it/userfiles/file/suvitikizebinaxikafun.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/1df247536579697091c5081eeac3741c/fomediwuvonupoxegugak.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/ae7ffea58e40afae2e989a07186c139c/3609717525.pdfIn PDF document text
    • https://bwawarszawa.pl/upload/file/74635677962.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/1608146365a881---31571090372.pdfIn PDF document text
    • https://tasleemdubai.com/userfiles/files/vewolixavowogowoz.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/5deab19d7b440b7e6264c506e9499535/jixokew.pdfIn PDF document text
    • http://delshadian.com/public/userfiles/file/fozapedevirulogixabatawu.pdfIn PDF document text
    • https://wlao.on.ca/wp-content/plugins/super-forms/uploads/php/files/0df14109cc7a330e53fb4ea673fa1f99/delamuxuzuvupitudigaxi.pdfIn PDF document text
    • https://www.nosolodespedidas.es/wp-content/plugins/formcraft/file-upload/server/content/files/160a7384a64f9d---92669344354.pdfIn PDF document text
    • https://ekransamara.ru/files/15251908917.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/79ed6c0d880f0eab92a6959eec60b6fc/85759820679.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_off00010d3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3D 10784 bytes
SHA-256: 3f942d55b30b666c73141c05353401d82b4e1d5ae1a5c50b7a6dd84edaa4d1f1
font_01_sfnt_off000125c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C2 18688 bytes
SHA-256: 81418157e74b5e98f7137083f3138e58545eecb361e3307bb37502e85b740081
font_02_sfnt_off000155d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155D3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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