Malicious PDF — malware analysis report

Static analysis result for SHA-256 cee4a54d2a16d7c9…

MALICIOUS

PDF

79.9 KB Created: 2021-09-18 09:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: b054cbce630024c301023302ebe9f4ac SHA-1: d40ba5bd111a179757096cd6548f73c42500ccd1 SHA-256: cee4a54d2a16d7c90c46fb22d1313803f7fbdf83dfea24a440124c4022faae95
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is unreadable, but the heuristics and URLs suggest a lure to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/161304f505719a---tobexovipijonujo.pdf In PDF document text
    • http://kyanite.tv/userfiles/file/37478436429.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/37034612714.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16133ba140935f---nomidatefowudi.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109030622187972.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/kukuwesuxuvorukigiraw.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/o339ckiuii5ij76meb7h8395s9/petegamuwejage.pdfIn PDF document text
    • https://gilbertems.com/videos/file/faratulokafagobadewoweju.pdfIn PDF document text
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea13060a60---60141175323.pdfIn PDF document text
    • http://www.eurosecurimed.com/ckfinder/userfiles/files/kozaxivepenobewinumipu.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/rolijoju.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/wutasifusojutevilakotewe.pdfIn PDF document text
    • http://uitetenindex.nl/images/uploads/xitemivuzekejeseni.pdfIn PDF document text
    • http://agierresrl.it/userfiles/files/doxabisesirakudireredavoz.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/1613a0cbe09ee1---94837685464.pdfIn PDF document text
    • http://creationart.hu/files/file/fejufixowuparika.pdfIn PDF document text
    • http://idealhca.com/admin/images/file/85500574363.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/11598188020.pdfIn PDF document text
    • https://testgit.begurholidays.com/uploads/userfiles/files/pifixebuxusa.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/zaxatavuropefe.pdfIn PDF document text
    • http://a-swiss.com/upload/userfiles/file/jipevoteniwamagekituvava.pdfIn PDF document text
    • http://lso-msm.fr/userfiles/file/60578795817.pdfIn PDF document text
    • http://learnazia.com/fck/imagesfile/39692123503.pdfIn PDF document text
    • https://beauty-full.ru/uploads/files/lubexufesi.pdfIn PDF document text
    • http://gyogytornasz.hu/editor_up/lugerodederime.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mirroring+firestick+iphonePDF 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_off0000d47a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD47A 10636 bytes
SHA-256: 3d3540704a939da7c2d8b9a314f507cebb62b059f80d9c44ad280528573edfd4
font_01_sfnt_off0000eccb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCB 17484 bytes
SHA-256: af421aaae7c9ae88ca946da6dcdca17abede67523f4debfd1911cc3e592c1758
font_02_sfnt_off000119de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1