Malicious PDF — malware analysis report

Static analysis result for SHA-256 c095e25ea100bce8…

MALICIOUS

PDF

71.9 KB Created: 2021-09-13 10:47:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2b063b2c21d6704e83af1b5a6e6039e7 SHA-1: 265e85b8058c1291fea8e7b25af1277f2953b67a SHA-256: c095e25ea100bce83dac24b502bad145bf2399c66f9f79e130566f4ad5f5cede
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed to lure users into clicking these links, potentially leading to phishing sites or further malware downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://huntic.ru/uplcv?utm_term=minecraft+house+designs+tutorial PDF link annotation
    • https://warsztatgdynia.pl/app/webroot/media/files/mojiwaxavivozudomerawila.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/madizotukugax.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/0gjddc3ipaah02v1d1ufkjlu0b/xulibivesudek.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/j4uj738n1036fb6u69nhc9b883/dotufogosixemateko.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139cd688c69a---47427223249.pdfIn PDF document text
    • http://lapawan15.com/shop/fck_file/file/buxeji.pdfIn PDF document text
    • http://hibertek.com/image/files/20210910_123813.pdfIn PDF document text
    • https://valleyrentals.com/userfiles/file/28866022695.pdfIn PDF document text
    • http://shtaket46.ru/page_edit/_samples/userfiles/files/gamivumizuto.pdfIn PDF document text
    • http://www.enredmail.com/templates/files/idCliente_/file/moxavoborugipibipiro.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/3677523648.pdfIn PDF document text
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/i5drvqv7bei18t2rjgijausnl4/44860223679.pdfIn PDF document text
    • https://thefencedocumentary.ca/adminfiles/file/66203270055.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/17399148291.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/likijuxepazunebaw.pdfIn PDF document text
    • https://dalba.net/other_files/File/jimin.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/zifare.pdfIn PDF document text
    • http://hftyby.com/upload_fck/file/2021-9-2/20210902231156741164.pdfIn PDF document text
    • https://blugarden.eu/file/vamujimofu.pdfIn PDF document text
    • http://amy-tsai.com/images_express/userfiles/files/59161185464.pdfIn PDF document text
    • http://ncfc.com.tr/ckfinder/userfiles/files/jodanofef.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/vimiwukoruja.pdfIn PDF document text
    • http://dietgame.net/admin/fckeditor/data/file/20210905022558.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/5270979546.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_off0000b7e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7E6 10848 bytes
SHA-256: babdd110b50ff530fe5d5fc87d1a0638285e5f4a18b1dff4cbb745a2368b96db
font_01_sfnt_off0000d0ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0AC 16108 bytes
SHA-256: e05e2d61caaf8d686de21b915952a4c2cc172c59eb8724899165a6a4c7aba5d2
font_02_sfnt_off0000f9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1