Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec4832f58e94755d…

MALICIOUS

PDF

94.3 KB Created: 2021-08-09 10:23:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 732cbd20b44c1f906fdced785f626abb SHA-1: 3f0b5a11672b97d1f4137878b5215626ee9a98ca SHA-256: ec4832f58e94755d61c0fd16a742358f5cc4a95474c29267038902bfcb1f265b
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many pointing to compromised CMS uploads and disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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 http://autoshiftbid.com/fckeditor/userfiles/file/jibiganala.pdf In PDF document text
    • http://www.jcca.co.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c8f1426a621---jidijogo.pdfIn PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/160c0e524028c0---56123908571.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/e30b1ffef629a348a847986051efb36d/dumuvikejuxewozelupajuxa.pdfIn PDF document text
    • http://heaig.org/editor/ckfinder/userfiles/files/difijuvesutogeveruj.pdfIn PDF document text
    • https://lynnesnaturaltreats.com.au/wp-content/plugins/super-forms/uploads/php/files/b4c9cf9f2baccb9e32f3f5901f829c73/95679549941.pdfIn PDF document text
    • http://www.northeastmarquees.com/wp-content/plugins/super-forms/uploads/php/files/14d060c11583acbcbb11e59da6442664/dasorazekasage.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/weradubizibok.pdfIn PDF document text
    • https://designclarf.it/file/ninanegitusirisiwug.pdfIn PDF document text
    • http://pocatellocampfire.com/wp-content/plugins/super-forms/uploads/php/files/l1r4fl41gd2dbksr7029vjc9k9/motudokaredozabu.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/saxejarekozuxi.pdfIn PDF document text
    • http://wenxuezj.com/images/File/62528016380.pdfIn PDF document text
    • https://lamaisonducoeur.ca/upload/editor/file/76629891726.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ef84ee54f---ropidejamub.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160774d6c5038e---jikokukisotidojatosuwaraw.pdfIn PDF document text
    • https://seitonsolutions.com/ci/files/gaton.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/3c92bae02dca4d27309fd015686b593a/97447890785.pdfIn PDF document text
    • http://platcometals.com/images/file/44414440069.pdfIn PDF document text
    • https://www.corridar.com/wp-content/plugins/super-forms/uploads/php/files/vucsf0ba2u4ov39qvrrjcrci01/juxilajujimutunutuxiworo.pdfIn PDF document text
    • http://www.pvvc.cz/files/45797132809.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60166397663.pdfIn PDF document text
    • http://bodymindspiritconnection.org/clients/5/53/53f1eac0d8ee32431a47b4e1af774f29/File/kikole.pdfIn PDF document text
    • https://guapa2.com/admin/fck/file/fomekerigomitetezejavu.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a5ceb770f46---verifeko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=how+do+i+turn+off+active+on+messengerPDF 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_off000109d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000121e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121E7 11016 bytes
SHA-256: c044d60dd4974b37af7f311df5f3b487a49dd5866190381a3c4e69b07ae76704
font_02_sfnt_off00013b5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5C 17696 bytes
SHA-256: 82babe0fd3a4889243c265fe35b04c77357c5c9c79d50c0415b36fa75882ee2e