Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2b5cb82d92914a6…

MALICIOUS

PDF

88.7 KB Created: 2021-07-01 17:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 97630f53baa75cd326ebc69ba9d64995 SHA-1: 245a4e241ce51d7fc413a041def290cf9a4e8fdf SHA-256: b2b5cb82d92914a6c398663ccd0b6aeaed8485cc6b10b04a0e56e622c68776c7
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, several of which are hosted on compromised WordPress sites. The primary goal appears to be to lure users to malicious or compromised websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://abhimaninteriors.com/ckfinder/userfiles/files/gefuxavezoterikokomibos.pdf In PDF document text
    • http://asckhn.com/acskhn/userfiles/file/93925313527.pdfIn PDF document text
    • https://athensviptour.com/wp-content/plugins/super-forms/uploads/php/files/240108464f96cb32dfac6be092560609/mopareb.pdfIn PDF document text
    • http://faradbox.pl/files/file/96205589389.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160accb04ea420---96759296536.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/294fa9cd0eb1419f13b272415e4a3b3d/dowuba.pdfIn PDF document text
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/3pd652icgemhdvb0ng13oj6aem/kefinedilawoxa.pdfIn PDF document text
    • http://marinapogon.pl/upload/file/xulabuwexefegexokidojuvuv.pdfIn PDF document text
    • http://dsm-trhs68.com/clients/8/81/818e764d3414495a915a5f66638dc9bf/File/88616973880.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f594a66387---92411976018.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/25e3dfc3e8c8f9e80fe66f59b3c103ce/33787790589.pdfIn PDF document text
    • http://talani.nl/userfiles/image/file/kuxifuripi.pdfIn PDF document text
    • http://attlas.center/userfiles/file/54990630540.pdfIn PDF document text
    • http://www.pzkexie.com/up_files/file/14790386112.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac798255134---75205638660.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/fotikepenejipomabe.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086dc49e8ca1---33561810689.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c404ca04d---zitowovixazin.pdfIn PDF document text
    • https://xaydungdonggia.com/app/webroot/files/images/pages/files/masogodetobamuwuloradid.pdfIn PDF document text
    • http://bigband-ulm.de/userfiles/files/94923085885.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/21339450836.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/84759f1e6ea81f0fe2a68e2eac0a99dd/kedodixagefowavi.pdfIn PDF document text
    • http://stark-tools.ru/images/uploaded/vikulipogowexam.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d4216bb3c---19766557321.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160851a719ee82---73364925376.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=axial+skeleton+systemPDF 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_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 16760 bytes
SHA-256: 8284ee0ae07e2256d5233e71082846e938ad0da9481f10486b251a90235b59ef
font_01_sfnt_off000125df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125DF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013df6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF6 10456 bytes
SHA-256: c4b7f7434e0417cc15ece0792548b9ac44f5c39ffdca2b677e8f873b040601aa