Malicious PDF — malware analysis report

Static analysis result for SHA-256 1654ec811e275934…

MALICIOUS

PDF

77.1 KB Created: 2021-09-14 01:09:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8e031214360f6bfff2dbc21a51bb4517 SHA-1: 4c4c6bd11326d7693cffdbefd4c734f302de088e SHA-256: 1654ec811e275934c669f7314f37b4bb04a469ec24f152e1698623708a41140e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests malicious intent. The primary function appears to be directing users to external, potentially malicious, content.

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 http://potlista.com/file/files/jasapujefegasakopededado.pdf In PDF document text
    • http://photou.cc/ckfinder/userfiles/files/69363572703.pdfIn PDF document text
    • http://vildmarksjagt.dk/userfiles/file/desapevavo.pdfIn PDF document text
    • http://serting.eu/userfiles/files/99536055479.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/42580564208.pdfIn PDF document text
    • http://qianxish.com/ckfind_image/files/posaxadibirefixoritevofi.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613a908361f77---94213829946.pdfIn PDF document text
    • http://www.ecrivains-consult.fr/easyonline/ckfinder/userfiles/files/19412531950.pdfIn PDF document text
    • http://coutleelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/mezozesuridipap.pdfIn PDF document text
    • http://minerva-collection.net/files/files/ravodupa.pdfIn PDF document text
    • https://areopag.ru/sites/default/files/uploads/73119599380.pdfIn PDF document text
    • http://yamamatoen-wanwan.jp/ckfinder/userfiles/files/vuneveforovufijigokora.pdfIn PDF document text
    • https://milsagliksen.org/upload/ckfinder/files/diwigenijobowetusum.pdfIn PDF document text
    • http://sd-admin.fazendapenaazul.com/ckeditor/uploads/files/781199587.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/jinezamagenuvi.pdfIn PDF document text
    • http://centralgiving.com/media/userfiles/file/varesijimi.pdfIn PDF document text
    • http://dailymaydemtien.com/userfiles/files/43159733693.pdfIn PDF document text
    • http://duhochoangthanh.com/upload/files/xaluxefowimi.pdfIn PDF document text
    • https://glaze-metalart.com/upload/files/xakekafiwomasiji.pdfIn PDF document text
    • http://emannsltd.com/userfiles/dadeg.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/1059dab80b56aecbc2b12e3d515a9d4f/26830098668.pdfIn PDF document text
    • https://www.campacinter.com/image/upload/File/96489966050.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161312e33c5c35---60995034280.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=couchtuner+movies+free+downloadPDF 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_off0000c98c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19E 16924 bytes
SHA-256: 2e68bf532f98ce74842d5f70100cb56d28197e3fe0b06af413d64607b01e9b03
font_02_sfnt_off00010d7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7C 11024 bytes
SHA-256: f9f0753a4a874c44618779d9313ade561d1be4675774d1a38a7c4e3def5103b8