Malicious PDF — malware analysis report

Static analysis result for SHA-256 198b60904f1cf259…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 09:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4d2e4f28837b02b2f931939852010774 SHA-1: b8f56ecd07497749494d8a0fdd308658c6b22d5e SHA-256: 198b60904f1cf259904560b1dbb4ef3bb5d54174dd3c6343db4aa8fd13bcaea5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites hosting further PDF files. This indicates a phishing or malware distribution scheme, likely initiated via spearphishing. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140fd0d590b4---kazegalijazipekoxoxavor.pdf In PDF document text
    • http://abwvictory.com/uploads/files/32782632774.pdfIn PDF document text
    • http://americansemitruckparts.com/d/files/tuwunuribarowilif.pdfIn PDF document text
    • http://dalnoboy.org/data/filestorage/upload/files/17980158269.pdfIn PDF document text
    • http://shriramashramssschool.org/userfiles/file/62614834026.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1615249322cd24---vexiwufugeta.pdfIn PDF document text
    • http://www.chiringuitomediterraneo.com/ckfinder/userfiles/files/fatemutokanajezuxuzutozu.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1614caf6252541---2854838692.pdfIn PDF document text
    • https://moniimpex.com/wp-content/plugins/formcraft/file-upload/server/content/files/161449959ebdbe---tifajog.pdfIn PDF document text
    • http://sungder.com/upload/nulogalosakulujusizo.pdfIn PDF document text
    • https://www.allduniv.ac.in/ckfinder/userfiles/files/dapalotaloniborudumov.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/ufu90itg7iqd2suoqch47mc0m4/60209945286.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/bomesu.pdfIn PDF document text
    • http://soloparamideco.com/js/new/fckeditor/userfiles/file/pizavaralikaw.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/veminosibekute.pdfIn PDF document text
    • http://gabortech.com/admin/file/79766690238.pdfIn PDF document text
    • https://galerieportelouise.be/userfiles/files/23655403409.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/89002189162.pdfIn PDF document text
    • https://laser123.com/geektic/files/sipufowiwiwez.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/kawaguzes.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/83627212140.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/bikiwopifagiduf.pdfIn PDF document text
    • https://giverny-bkk.com/upload/files/48739686310.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=machine+learning+engineering+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_off0000ae7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC690 14744 bytes
SHA-256: be89ab3963ab91b26b569dd4c73cd0ce17e5a15dca27c0ce9bd7eb5f6315fbec
font_02_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 10712 bytes
SHA-256: fb67494923f0a9505886187d6ffc0bb990a22369e294076fb406045fdd684d02

Open this report in the interactive analyzer, or submit your own file for analysis.