Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2ba6eda478ddb7…

MALICIOUS

PDF

87.4 KB Created: 2021-08-08 16:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 10ceb6ac0ecd83a9c383ac4918709c47 SHA-1: 245d56f4b9edd9bd1eb2343fe26c96bcbf57b4a7 SHA-256: ca2ba6eda478ddb7ed6c091fca00054eeac7ab9cd70b3f42001d9b7a34c2a54c
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users. The PDF's structure and the presence of these links strongly indicate it's used as a lure for phishing or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://wastran.ru/uplcv?utm_term=entorno+laboral+definicion+pdf PDF link annotation
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/8c0f42282986a280afdd4a62164f52c0/22361137909.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/94732197264.pdfIn PDF document text
    • http://nature-revive.org/files/file/wetarasiki.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/crbt2mn5j7d4ms4but1du354qd/88900395455.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e3e98ab615cacdaea5bd02679488d52d/kuwabagerejegiko.pdfIn PDF document text
    • http://bannermaul.com/userData/board/file/39627630544.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021070517004653.pdfIn PDF document text
    • https://vieclamkinhdoanh247.com/upload/files/67342079214.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/retidosixiximilil.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105d49c12933---53922355736.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/6206aoanaaeds6djb498gp3ub3/60203800804.pdfIn PDF document text
    • http://rnsnider-classof-68.com/clients/9/9a/9aaec9a1f64917203b32d8bba7bf2533/File/64966645241.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607784f20a55b---74449928414.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/10760677366.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16072f82d02c8f---22401333303.pdfIn PDF document text
    • http://aquatherm-graz.at/files/wenewijologova.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/43b1f229d5cdb25cd089aa8b6569e336/felokurasewa.pdfIn PDF document text
    • http://consade.com/userfiles/file/64615450104.pdfIn PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/a4cdc75f43e6c9c5db25250fc732e732/36710533722.pdfIn PDF document text
    • https://hosrem.org.vn/ckfinder/userfiles/files/suzaluvoluxajadav.pdfIn PDF document text
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/24942eaeffc3ce7b4dc8c10df737c19d/49780013277.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/uirpicg64g6kqliorl5vg91oae/3621458141.pdfIn PDF document text
    • http://autohondl.cz/userfiles/file/83995435758.pdfIn PDF document text
    • http://churchliferesources.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610997491ab93---tefofozu.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607b13fce2324---gigikizisegewedanib.pdfIn PDF document text
    • http://daehwa.info/uploaded/file/famojavawurapiv.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_off0000f122.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF122 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 10568 bytes
SHA-256: aa0f1e6563f7f0e8de97cec84079fb4ede3a6e36f8112af463c8cd976a3dd745
font_02_sfnt_off00012126.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12126 17868 bytes
SHA-256: c78b675d8a5088310384cc381d6d55cf8e356ccd1014f8fcc76b2757b9a4da66

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