Malicious PDF — malware analysis report

Static analysis result for SHA-256 91297170dcf11898…

MALICIOUS

PDF

85.3 KB Created: 2021-07-19 15:05:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 217c0c702f2e3688021ce2b33dd24b1a SHA-1: 6615edd30073aa0a4131c481b865c84a2766f61e SHA-256: 91297170dcf1189842bf822699e0eff291ef703b6ef7048ffa3d9b8bc9d2fbee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, flagging it as a phishing trojan. The document contains a link farm pointing to numerous distinct hosts, many of which are hosted on compromised CMS upload storage or disposable hosting. The primary attack pattern involves luring users to these external sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://defi128.com/userfiles/files/94033041920.pdf In PDF document text
    • https://promise-land.com/upload/file/libagifuramobetibelu.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609bb786ae86c---88639889438.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608938362ed50---4420115202.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/htgvuc72jiiqqobsaj5597fdsd/48944330799.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/3b173c4022484e9155ac455c84a263cb/jowazeketuf.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b21d62bed41---57126423244.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/a39fb184d3e89c4fc5526621f66ae28e/sizisetakun.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/a56b2b18814728e9f0b494479f002c4c/wakaserawiranoperatanosos.pdfIn PDF document text
    • https://too.kg/wp-content/plugins/super-forms/uploads/php/files/675bcd522607cbc0a03cdae5e40a8dca/82543346060.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/vgtnp4srvoen3g4f94k2r06f94/26809260428.pdfIn PDF document text
    • http://kompletucetnictvi.cz/files/file/jenovuvonis.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/99735dee039701252eab673f3492f01e/xezodupelezake.pdfIn PDF document text
    • http://airfa.it/userfiles/file/55770893059.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/dba6b0c850019c4200ffbc1db6feaa24/vutomoruvuwat.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/160788a0a6fd99---65785107929.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/pupalefinikorenusa.pdfIn PDF document text
    • http://starlightcelebre.com/clients/4/43/43e9139217482d7666ce300faf566241/File/wokutatovaraxegerufag.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1216720752---jakategikenabubererog.pdfIn PDF document text
    • http://kamkmori.cz/ckfinder/userfiles/files/tepal.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070bd11d56b2---jilinuwuxotenik.pdfIn PDF document text
    • http://stroynerud-sm.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16088bf4a90c71---29567119968.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/t30siici5ens7aclodd37h8cr4/jisok.pdfIn PDF document text
    • http://luisacortesearchitetto.it/userfiles/files/58997487405.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=idols+of+the+tribePDF 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_off0000ed51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED51 10276 bytes
SHA-256: a763a1a35f5a1b54b576b6b12ebdcfabab53a01734a6dd67f3b66d2fe5b1601d
font_01_sfnt_off00010480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10480 16844 bytes
SHA-256: 2c90f629ceef632515c53f17accfe7b0aa72595160a042b9ad20c9613d2e76a2
font_02_sfnt_off00013068.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13068 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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