Malicious PDF — malware analysis report

Static analysis result for SHA-256 69d39ae92e43b122…

MALICIOUS

PDF

85.8 KB Created: 2021-10-11 12:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 26c92e16566d8e51ed29ddab29a67a95 SHA-1: 82a5887784564236cbdd951a3c8f785b9a2e0cc5 SHA-256: 69d39ae92e43b12239d7aaa1daf0885744a0cb6ad0cf03b908bff5610b537673
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, with the primary attack pattern being the distribution of malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://thebottombillion.org/business_school/uploads/file/21542555203.pdf In PDF document text
    • https://sklepbonus.pl/userfiles/file/87525347615.pdfIn PDF document text
    • http://icaalliance.org/filespath/files/20210923040727.pdfIn PDF document text
    • https://systematix.pl/userfiles/file/wonizijabixirurazo.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210901225312683877dcfc3onwizgs.pdfIn PDF document text
    • https://decoveinvestment.com/userfiles/file/13157287201.pdfIn PDF document text
    • http://cartopack.be/Images/file/59562280370.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/76943625293.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/gudogonenorawesuni.pdfIn PDF document text
    • https://novamakine.com/upload/ckfinder/files/pexirulomasokuxuruv.pdfIn PDF document text
    • https://papersacksfactory.ae/images/bulk_images/files/38120674892.pdfIn PDF document text
    • http://evpltravel.com/xv_image/file/81780660814.pdfIn PDF document text
    • http://thcscatquea.hoaiduc.edu.vn/ckfinder/userfiles/files/95357671323.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/dekojutiwefoza.pdfIn PDF document text
    • https://www.abandassociates.com/ckfinder/userfiles/files/gutakogajivexa.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/jodofi.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613fa7e07e53a---77654955454.pdfIn PDF document text
    • http://cantinachitarra.it/userfiles/file/wegowekugajad.pdfIn PDF document text
    • http://greenmodels.ru/uploads/files/16718071013.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f75268e9af---fabogenozivige.pdfIn PDF document text
    • http://faceconnects.com/ci/userfiles/files/37848648186.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16140e9706beaa---fegejizifafarokevejidig.pdfIn PDF document text
    • http://feedproxy.google.com/~r/Xvkpad/~3/EqozwcbAC44/uplcv?utm_term=homeo+for+stomach+painPDF 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_off0000e88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE88C 10692 bytes
SHA-256: e1489cb59f75f405ce69f4d1d1fca7fe53cb9d416207bd50a052c94787c6ffd0
font_01_sfnt_off000100dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118EE 19204 bytes
SHA-256: d4d619ce939166099b1d0e9201f46e5d2a5341877e2ce259773c0de549694e28