Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b20549aa069cf84…

MALICIOUS

PDF

115.8 KB Created: 2021-09-08 07:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 15db7bee5cab7010ca1e902e6ef90a78 SHA-1: 0567ca53331abc42615fb8bf181dbdb591cf87d9 SHA-256: 4b20549aa069cf849987d3722ba0f2dd49697ff16afc2c3bf4585917652a0496
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as containing a link farm pointing to compromised CMS uploads and disposable hosting. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document body is unreadable, but the presence of numerous external links suggests an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/2492daf74f88d33a14c7233b5f695096/mazibaferixanutorab.pdf In PDF document text
    • http://canevinclassof70.com/clients/6/6b/6b8b8ee0d314e59372afbcb75100d768/File/71646323156.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/konuvunudof.pdfIn PDF document text
    • http://easyliveconstruction.com/ci/userfiles/files/26663199280.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/b55fbddd47b9909aee67ac837e3e356e/zowukopome.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/5ed1a996711f9fca042e53f00d5eccb6/83129458750.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8621ef1253---newuluvunibupewixi.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16094aa0a2784a---70481128483.pdfIn PDF document text
    • https://synersys.fr/contenu/file/28898075736.pdfIn PDF document text
    • http://sissonne.hu/editor_up/zirunetupef.pdfIn PDF document text
    • https://www.beewellrx.com/wp-content/plugins/super-forms/uploads/php/files/tmp/22329433616.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/86952644726.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/t6sna3felug43h8unokhuld00f/kuvaxawomutakekojagezesex.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/78462228632.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/fixenezezawolor.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/faal5s6e02q3t3alod102h178p/kotogusixebikub.pdfIn PDF document text
    • http://zhongguohuachun.com/d/files/14352341509.pdfIn PDF document text
    • https://www.hmgfinance.com/ckfinder/userfiles/files/puzakotoj.pdfIn PDF document text
    • http://casaatlantida.com/userfiles/file///zotineduxusonab.pdfIn PDF document text
    • http://asfalon.com/__files/file/vinabagopemezomavidi.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/78a72bf304ea5eca08ad3773645fa846/dowenowulewis.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/rarimikon.pdfIn PDF document text
    • https://autosofortkauf.ch/wp-content/plugins/super-forms/uploads/php/files/h5db3coe6ct2sf615jlt7t9gbs/46152817212.pdfIn PDF document text
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607240f6a2c6c---zagiwejanebixu.pdfIn PDF document text
    • http://www.firengo.com/userfiles/files/18092175061.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=makkar+cue+cards+2019+pdf+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_off00015f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6E 11156 bytes
SHA-256: 9d1d391550b47c5b7ba6d4797d478c7c36c233df6dae80c7713a7f79f36c04b1
font_01_sfnt_off000179cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CD 18360 bytes
SHA-256: 41c60907bf5796afb76ac84dfcccb17a811a49643bd91496d4f93424dad0ec64
font_02_sfnt_off0001a924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A924 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1