Malicious PDF — malware analysis report

Static analysis result for SHA-256 c26473590e08abb3…

MALICIOUS

PDF

73.4 KB Created: 2021-09-06 12:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 37148d9c82ff6987d3be7b8a1dde8fe2 SHA-1: 51e8643eaa134dd4b7e9edcddd568b4727bd3ba2 SHA-256: c26473590e08abb3bc3229f93f184b35035002aeaa8b446e939e295bca63b0bb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, directing users to compromised WordPress upload storage and other disposable hosting sites. The primary function appears to be redirecting users to malicious sites, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://catamma.ru/uplcv?utm_term=inequality+questions+for+bank+po+pdf PDF link annotation
    • https://unicornproduction.gr/wp-content/plugins/super-forms/uploads/php/files/9577d6eff0fc692023949bc35a85551b/42578257622.pdfIn PDF document text
    • http://innovatepc.com/userfiles/file/nidalunixisotojupadi.pdfIn PDF document text
    • http://psychologkmalinowska.pl/ckfinder/userfiles/files/sadumujaxafelejuvalobif.pdfIn PDF document text
    • https://melnikhouse.com/userfiles/file/lajeguzikupomidudajev.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/4a8ce52dd80b7065338a67d2a5044ebd/kigax.pdfIn PDF document text
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161071b6c20560---gukumezujumumiza.pdfIn PDF document text
    • http://cungcapbaoduongcuanhatban.com/upload/files/13651451600.pdfIn PDF document text
    • http://moristas.com/userfiles/files/nepoporidawizijejis.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/jiborafinadimajiwimom.pdfIn PDF document text
    • http://postelezmasivu-brno.com/ckfinder/userfiles/files/8413719354.pdfIn PDF document text
    • https://palet-school.com/files/files/vubetanabuxawa.pdfIn PDF document text
    • http://dossalas.com/wp-content/plugins/super-forms/uploads/php/files/cecd375b0132b44f5617999c5648165e/minezafezefutupov.pdfIn PDF document text
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/64f62a884253ea062fd04f8c11625af1/nafarefumi.pdfIn PDF document text
    • http://www.ortodonciaelisafarache.com/ckfinder/userfiles/files/lutiveregig.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b3e43afc7---9853084023.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/25e9ca090b5100f2177c680428e88b97/49980790329.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/c274ab242d5ca9a18fbb94c057ffa800/xawekezex.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/52791410701.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/wezigo.pdfIn PDF document text
    • http://xn--k1akb4c.xn--p1ai/userfiles/file/bopilijasutugelaberugo.pdfIn PDF document text
    • http://lsbwg.com/ckfinder/userfiles/files/20210717/1501179524.pdfIn PDF document text
    • http://mamnonlittlesun.com/upload/files/80884369117.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/eb5ebaf46218d1082ce42c149dca346e/26670617470.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_off0000b855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB855 17908 bytes
SHA-256: 25984855fa98dec3e350e3a919e84987e2aacdad970ac2d62dc3148c99ac9258
font_01_sfnt_off0000e630.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE630 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE47 11036 bytes
SHA-256: 5419184f75db4e1a538967ad1752f776b6db892d1ede5ab8797f3b7a2cddf9a3