Malicious PDF — malware analysis report

Static analysis result for SHA-256 f755281e17c94d2f…

MALICIOUS

PDF

82.3 KB Created: 2021-09-08 05:18:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7a5d841aad2902a56ffcd98dc6de5ee4 SHA-1: df136bff512ebe97d72c0ff3042228e682da8447 SHA-256: f755281e17c94d2fb2f1941174851519f2a1291f7141a459bece7f4290bd878e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs that point to various websites, some of which are hosted on compromised WordPress installations. The presence of these links suggests the document is designed to lure users to external sites, potentially for phishing or to download further malicious content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://synerhu.ru/uplcv?utm_term=scientific+method+matching+worksheet+pdf PDF link annotation
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160e61be7a2daa---vaxagetazasijixavor.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/87352135072.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/koxituwonajupeb.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tdjnimb7044u9vh58o1v9psehh/24321055421.pdfIn PDF document text
    • http://hemeringen.de/ckeditor_ablage/userfiles/files/73164332091.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/minalum.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/81427643973.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/50475706220.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/d087b075a862fb896a94bcbf0938331b/65421936639.pdfIn PDF document text
    • http://saigondome.com/uploads/userfiles/file/68671632778.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/60514256761.pdfIn PDF document text
    • http://budka39.ru/files/26102326501.pdfIn PDF document text
    • https://proia.bg/userfiles/file/fovewibakifaze.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/542c2fd8e8d75619f76c13c1c3d9569f/17799306799.pdfIn PDF document text
    • http://www.ks-zahnarztpraxis.de/upload/files/67646060596.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/021c34370077c698c989feb631f175cc/93346000517.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/6cad7b885b5445ede68e48423adb87e3/58140019257.pdfIn PDF document text
    • http://cukierniabrzezinski.pl/www/artizam/fck/file/91676716077.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/74248263783.pdfIn PDF document text
    • http://www.icareonline.net.au/ckfinder/icare/files/59726346123.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/zikesipipefikabeguzare.pdfIn PDF document text
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b0f5457fc---dexevilivowavona.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_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 17348 bytes
SHA-256: dd61383ff39ac0ef8e97848f931eef702b27803ff21b30d14867344c6b231d76
font_01_sfnt_off00010982.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10982 11276 bytes
SHA-256: 991d69327b6864a5379cfaaf92dbfdd83672f8d75b2d0424007073a02ffcdb07
font_02_sfnt_off000123ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x123AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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