Malicious PDF — malware analysis report

Static analysis result for SHA-256 452a45a523bf050c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-17 02:35:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f9643c85808d0224e8da8f75b11ee451 SHA-1: bcf5bb7aa267a950ea3796bdc0a7487a8d1a0c1d SHA-256: 452a45a523bf050ce37f53e464417db9cb2bfe730cead0d22f57275dc46f5f91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised CMS uploads or disposable hosting. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest it's designed to lure users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://paeonia.ch/userfiles/files/jufivixarulofafafeso.pdf In PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/mibetesubuxut.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/cb5085d8f5cdecdd8a2ad09db77b3ed0/83232488158.pdfIn PDF document text
    • http://zoscm.zohukum.com/ckfinder/userfiles/files/35083481045.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161360bd4a877a---tuvujetovixawexe.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/gebaxebaz.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/sixosonoxisavefuf.pdfIn PDF document text
    • https://billard-hauri.ch/userfiles/file/31691218031.pdfIn PDF document text
    • http://fuku-zou.com/userfiles/file/49713490276.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cbb8e51e75---lowil.pdfIn PDF document text
    • http://generaldistco.com/images/file/44079810036.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/bukotizazamilolojuxe.pdfIn PDF document text
    • http://tbeaindia.com/userfiles/file/fulavamuduwojonuxabixomu.pdfIn PDF document text
    • http://fedime.org/imagenes/23641688582.pdfIn PDF document text
    • http://kastely-vacduka.hu/fileok/file/1307170222.pdfIn PDF document text
    • http://baove24h.org/upload/files/83113087040.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/lagupolujabidim.pdfIn PDF document text
    • https://bushregenerators.biz/userfiles/files/40193965507.pdfIn PDF document text
    • http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161355744c95b9---39948230178.pdfIn PDF document text
    • https://korzayithalat.com/spot/admin/fckeditor/userfiles/file/wibofebusudugelelakab.pdfIn PDF document text
    • http://diencongnghiepvohoang.com/uploads/files/razovelelekogi.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/gujeverabanevasas.pdfIn PDF document text
    • http://halanmilk.com/upload/files/lulik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=123+movies+mamma+miaPDF 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_off0000b67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB67E 18012 bytes
SHA-256: 142ce90cde9db8969b27dea2041465374476eb9905a8296f73ffa28aa96ea20e
font_01_sfnt_off0000e5b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B9 10236 bytes
SHA-256: 831c46398c76c62ea75c757cc1bf5134e01934b7e47345847d9364ad3405b1fb
font_02_sfnt_off0000fcd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1