Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d4daa15f8e69dba…

MALICIOUS

PDF

75.5 KB Created: 2021-09-17 17:49:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: e3416b2f1a73a3360b81c525c1ef3f62 SHA-1: e4a1fb836cd8f00a4ec5865afd82c504cb36cd97 SHA-256: 2d4daa15f8e69dbaade283cbe3aca71eb6044071f041fbaa1867a8be82b5b993
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://nedimgame.com/calisma2/files/uploads/zoripotoja.pdf In PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/5acd105f07c7dbe4734fac8df9412e1b/paxedupovimanojujeru.pdfIn PDF document text
    • https://inarsindbari.org/uploads/37007592709.pdfIn PDF document text
    • http://sicompk.com/survey/userfiles/files/kuvozelulemazisuborilip.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/xinamedaz.pdfIn PDF document text
    • https://roarmysecurity.ro/mm/file/mopom.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b36aa057de---likuzirisesobofur.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/zusezazunibunur.pdfIn PDF document text
    • http://taxplus.in/images/contentimages/files/xedavaxobikizumavamo.pdfIn PDF document text
    • http://liccuza.ro/stiri_files/file/37564631208.pdfIn PDF document text
    • http://tatishev.ru/admin/ckfinder/userfiles/files/23231847469.pdfIn PDF document text
    • https://zemiigori.com/uploads/file/kudof.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbd52186c8---56392116020.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/bimegaxedelubirudubap.pdfIn PDF document text
    • http://syuncyoku.jp/upload/file/71585712614.pdfIn PDF document text
    • https://art-eria.pl/mandarynka/pliki/files/11807955875.pdfIn PDF document text
    • http://wowbond.com/upload/Fckeditor/file/93163129408.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/dopk07qk2ab5klphmu1irpeno0/laguruj.pdfIn PDF document text
    • http://gallery4walls.com/upload/editer/file/57758817366.pdfIn PDF document text
    • https://ascii.tn/web/cgi/file/dukimavizedopewev.pdfIn PDF document text
    • http://life-homeshop.com/asset/uploads/files/95770108746.pdfIn PDF document text
    • http://jaluzipro.ru/public/userfiles/file/komeg.pdfIn PDF document text
    • http://kiuanai.com/userfiles/file/lupupexuvan.pdfIn PDF document text
    • http://thechelseaff.com/user_uploads/files/faxifokuduxoxanaf.pdfIn PDF document text
    • https://groupburuemas1.com/contents/files/jezuzizonizuneritefod.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/modavisi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=android+contacts+syncPDF 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_off0000c4ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4AC 17228 bytes
SHA-256: 559277bb8c7e8a830cc78f786f6cfb832233c11ed3c0811c085285f3153d6029
font_01_sfnt_off0000f14e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14E 10280 bytes
SHA-256: 089628ae00e00c901d458eec742cb5d15b8557495e38d8b68a1f3277c7788605
font_02_sfnt_off00010898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10898 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1