Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7a47ad9828466a…

MALICIOUS

PDF

80.2 KB Created: 2021-09-09 14:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d7e0677a34b4865bbbb0ea4407f76652 SHA-1: 1649a2f6f0ab71e72c032245faa7b44bf60b0de8 SHA-256: 5c7a47ad9828466ad592aa33e68d68cc4bcf1dcb277584de7132f0f4da04002d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or SEO manipulation attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded JavaScript is a common technique for executing malicious code within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://ebrinteractive.com/userfiles/file/25025625405.pdf In PDF document text
    • http://viettranslators.com/webroot/img/files/92318423221.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/23160871065.pdfIn PDF document text
    • http://konberdbio.com/upload/files/49187445142.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210904085419.pdfIn PDF document text
    • https://ballestermultiservicios.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d0eb43060---83551559024.pdfIn PDF document text
    • http://tikatalog.sk/_files/file/sovefopejafiluwoba.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf536f35c---9041066139.pdfIn PDF document text
    • https://bomnuocebara.com/quangbasanpham/app/webroot/upload/image/files/dulakepiwupax.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/tepitilowiluvapowodamade.pdfIn PDF document text
    • https://ambient-interier.cz/files/files/10020265494.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366924b7cf1---rikejapuxiziw.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/ea57647291655bb6dbe0c87f9c630a8d/12921483371.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/tulanuwelubazovave.pdfIn PDF document text
    • https://petala.gr/userfiles/file/jafasiburemurejugo.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/04b865f946e575d641cd706b1288b92f/32400712405.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/faroxafik.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/22287198140.pdfIn PDF document text
    • http://asiadomainstore.com/userfiles/file/kuzukem.pdfIn PDF document text
    • http://gestioniarmatoriali.it/25815573986.pdfIn PDF document text
    • http://chanhbon.vn/media/ftp/file/93212809265.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/8512189531.pdfIn PDF document text
    • https://muzpony.de/obrazki/file/88006705048.pdfIn PDF document text
    • http://barcabianca.eu/upload/file/91621616075.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+get+pictures+of+a+broken+phonePDF 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_off0000d555.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD555 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ed67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED67 17220 bytes
SHA-256: b4f6d22d08e0b59277d0a29a5bea5cf951ac94e2ce385ad7f8aea70680d9733a
font_02_sfnt_off0001197e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197E 11124 bytes
SHA-256: 9b1d2f48f8dadab9cb342487c26c3ad80bf939085761ca3fc6a7a26907237342

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