Malicious PDF — malware analysis report

Static analysis result for SHA-256 7604e14e0ad4e4ec…

MALICIOUS

PDF

81.6 KB Created: 2021-09-17 02:34:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 30cf6d4ae776b7a0e4bb36f833eacf6f SHA-1: bbd24375770b46a1eece629c3a4732853e0e10c7 SHA-256: 7604e14e0ad4e4ec413d3bc98d93532c56609e4ce049b6dd659c93d39436c030
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 directories, suggesting it's part of a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cs-web-design.de/ablage/userfiles/files/remakozigokitiniwepemug.pdf In PDF document text
    • http://upoart.com/ckfinder/userfiles/files/nedelatamaveno.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/tuweruxuweliluk.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/161367c0177142---vujarum.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/bejexizetivoxitubidu.pdfIn PDF document text
    • http://cuuhoatudong.com/upload/files/2344920696.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e28275627a---42948664043.pdfIn PDF document text
    • http://eskuvoiiranytu.hu/blog/file/vigajipejosid.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/15019325840.pdfIn PDF document text
    • http://airconbank.com/upload/fckeditor/file/zeweruzisig.pdfIn PDF document text
    • http://stowarzyszeniemalyksiaze.eu/img/upload/files/duxibisufaxuseg.pdfIn PDF document text
    • http://eggtesting.com/admin/uploads/file/lijilafiluxalatiratexog.pdfIn PDF document text
    • http://pulsarvn.com/media/ftp/file/50871307402.pdfIn PDF document text
    • https://emotionalgift.youngzonejewelry.com/ckfinder/userfiles/files/59977895989.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/40139062233.pdfIn PDF document text
    • http://sarkar.ie/userfiles/file/27379778008.pdfIn PDF document text
    • http://joyearland.com/ckfinder/userfiles/files/tafutafuw.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/4d19dfb988bb1240ac3b44e0451f0ecf/rizosorok.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/fibobumuzozuxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=android+pokemon+go+gpsPDF 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_off0000d919.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD919 18844 bytes
SHA-256: 80a53f2258cc64aee74cf6db3d2d85e91ea8ae92ba61d577577038430dc7b102
font_01_sfnt_off00010995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10995 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AC 10504 bytes
SHA-256: 9d70fec955a86b2bf33c0922d461104c811e2cbe67f945f0cab7686f952706de