Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3c0f1dfc6a3114…

MALICIOUS

PDF

96.5 KB Created: 2021-08-31 21:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 10b5dc2739ec7bcd539dbd5edc579cdf SHA-1: e3b25b90ce87e5c25b8c84ad747f722921d41aa4 SHA-256: af3c0f1dfc6a3114834138115d8d79f247aefaf5bbf3b9f0c4f0dce4a170c3b3
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to various websites, many of which appear to be compromised or disposable hosting, suggesting a link farm designed to redirect users. The presence of multiple PDF link farm heuristics indicates a strong intent to lead users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://racecross.com/upload/edito_fckeditor/file/kuzunemuwizodidu.pdf In PDF document text
    • http://nhakhoasaigonkimcuong.com/uploads/images/files/xaragefowiwowozenatumo.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/nomuzemutiverawal.pdfIn PDF document text
    • http://strandedtattoo.net/file/19369713001.pdfIn PDF document text
    • http://misosmile.com/upload/editor/files/13762562393.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/67002aea8804de59741a2de250103243/xenidosu.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c15e07c44a8---55151282651.pdfIn PDF document text
    • http://huijingweb.com/upload_fck/file/2021-7-9/20210709054638893075.pdfIn PDF document text
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/e6d1270e74a6053ef68bcb6f2f0f1277/50666023119.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/dubadoleledupunubixakon.pdfIn PDF document text
    • http://sad-azov.ru/wp-content/plugins/super-forms/uploads/php/files/9931b1260f2f64851d57bd085cf72ec8/50286820795.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9eacdcca8---82848716914.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffdf0dc80d---xawiputodexokakiwimuwem.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/50186676302.pdfIn PDF document text
    • https://equalland.com/uploads/File/54547529055.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/kiwumisidiweneb.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/9u0i3o72hl0j5rkoa6jqkejg1a/muxiru.pdfIn PDF document text
    • https://jyapa.com/jhuoyue/uploadfiles/savazeda.pdfIn PDF document text
    • http://gesundimjob.at/images/content/files/99052950831.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930477561b2---pidisagajutegujuvanaduti.pdfIn PDF document text
    • http://africanhairbraidingsalon.com/userfiles/file/xexalaruzi.pdfIn PDF document text
    • https://creationstationdance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab12ece09c5---55384368716.pdfIn PDF document text
    • https://chiuman-hk.com/images/file/romelerinozozixumaja.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4dea42f79b110761354fee04c4724aa9/xolipokujuxugudukupubenar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=closeting+in+the+music+industryPDF 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_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 19124 bytes
SHA-256: 8774c8dd3dfbf394e269605f50631b6e4c4316388c08ad1f0d8454bbb3dee0a4
font_01_sfnt_off00014269.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14269 10900 bytes
SHA-256: 7e29249454560047b92c957426043353e30ee5c453f7d76c250899c3bd20b68d
font_02_sfnt_off00015b43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B43 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1