Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f985f137dbbfd25…

MALICIOUS

PDF

81.3 KB Created: 2021-09-22 21:21:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: fced62601645bcbfb5a188d2c8b1440a SHA-1: 48cb98d316f62940457c61977cdb28e47113c35b SHA-256: 7f985f137dbbfd25c88fedc791b546f95b7df9a53709a6979cad5bf3f1a99a0e
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to disposable hosting or compromised WordPress sites, suggesting a link farm or redirection scheme. The ML classifier strongly indicated maliciousness, and the PDF structure with multiple external links aligns with techniques used for SEO spam or distributing further malicious content. No scripts were extracted, but the presence of external links is a primary indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 5

  • 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://irlanc.ru/uplcv?utm_term=sending+and+receiving+sms+in+android PDF link annotation
    • http://konberdbio.com/upload/files/gekaralerebipobazosuned.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/ligulunixevuwofeb.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132d42d24f32---reromenaxepopivap.pdfIn PDF document text
    • http://www.heksan.com.pl/file/98018794084.pdfIn PDF document text
    • https://jeevandeepspecialcare.com/ckeditor/ckfinder/userfiles/files/vivogulijitil.pdfIn PDF document text
    • http://abwcolley.com/uploads/files/43537022301.pdfIn PDF document text
    • http://760_709737661.mildmedia-dev.eu/uploads/userfiles/files/novaruxanem.pdfIn PDF document text
    • http://polenes.cl/userfiles/file/78696182910.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/94569736686.pdfIn PDF document text
    • https://pakistanchristiancongress.org/userfiles/file/tawufegojamokunegu.pdfIn PDF document text
    • http://bjjiffy.com/upload/52742374713.pdfIn PDF document text
    • http://olymp-kiev.com/temp/fckeditor/file/10820606895.pdfIn PDF document text
    • http://unstitchedfootwear.net/files/file/kizikananebijexujod.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/99389faf73b7c820b8d12a6fea306301/xegavor.pdfIn PDF document text
    • https://penzehir.com/dorceiys/ckfinder/userfiles/files/8710667341.pdfIn PDF document text
    • http://www.rannatennis.ee/data/upfiles/files/jefibifefuwixesavoj.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/49346976500.pdfIn PDF document text
    • http://vuonlan.vn/data/upload/files/63831750652.pdfIn PDF document text
    • https://aronabritcan.com/userfiles/file/meneviza.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/tananopopowogejon.pdfIn PDF document text
    • http://dorisemitchell.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86460197846.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e80a6ca4c9575ffbebece81502683b92/libifevuri.pdfIn PDF document text
    • https://www.parquesanalbertohurtado.cl/ckfinder/userfiles/files/poxajutoxudazuluvusinim.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614181d086f25---juwaxijigabenunepijujek.pdfIn PDF document text
    • https://west-holding.com/userfiles/file/vegolopi.pdfIn PDF document text
    • http://aa-nusd.jp/33165372116.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_off0000d9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9BD 10708 bytes
SHA-256: 66496a043547dc6ddcf99f76a6fe2207c5055aa38859b477bb947b483b56126c
font_01_sfnt_off0000f218.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF218 17668 bytes
SHA-256: 86de391172de354fb58ea8239aeba3cc125693b846beebea0876bb5bc0f401f9
font_02_sfnt_off00011f4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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