Malicious PDF — malware analysis report

Static analysis result for SHA-256 73ec4ec7e4249996…

MALICIOUS

PDF

93.5 KB Created: 2021-09-08 20:10:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 493a400cc5668dddda5c4af6a5db80db SHA-1: d9e1fc81a525cf33927822575fc748c4e892601d SHA-256: 73ec4ec7e4249996cbad6c529ed68e5a9204c5953bcaf816e0cf2901f10294fd
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the PDF structure and link farm heuristics point towards an attempt to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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://flomogroup.com/upload/files/suvovatetomelorugo.pdf In PDF document text
    • http://www.hzkontejnery.cz/ckfinder/userfiles/files/73957143763.pdfIn PDF document text
    • https://www.tzounakos-insurance.gr/ckfinder/userfiles/files/35869617405.pdfIn PDF document text
    • http://fvv-hohenfelde.de/sites/default/files/files/wakeropafipox.pdfIn PDF document text
    • https://moveo-sport.pl/userfiles/file/kukogekalenesusurot.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a529df247---fajepopojexokek.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210904023814.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/2174698561.pdfIn PDF document text
    • http://vantaidongsaigon.com/uploads/files/60444762893.pdfIn PDF document text
    • https://www.uflo.edu.ar/ckfinder/archivos/documentos/9107892264.pdfIn PDF document text
    • https://www.kiteschule-kiel.de/wp-content/plugins/formcraft/file-upload/server/content/files/16133b0312cbdc---duromu.pdfIn PDF document text
    • https://fratellifurloni.it/file/80858097668.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/8905405181911d693d2a940f282c9e01/linibolumeluruvenizo.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380b0a65a37---lopoxobinazanomizuzuxaf.pdfIn PDF document text
    • http://studioesflores.pl/obrazy/file/vumedakuju.pdfIn PDF document text
    • http://www.agot.pl/upload/file/42766516184.pdfIn PDF document text
    • http://thegioimaychaybo.com/app/webroot/uploads/files/68941089730.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/jivix.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/6014169552.pdfIn PDF document text
    • http://abwingssuffolk1.com/uploads/files/kabuviz.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16137e027ef968---tewusutenenovexotozejivav.pdfIn PDF document text
    • http://nickelsgrafikdesign.de/ckfinder/userfiles/files/peworerupovewepurixukiz.pdfIn PDF document text
    • http://eszixv.hu/ckfinder/userfiles/files/85484887841.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/xanapopuvagorogitevadi.pdfIn PDF document text
    • https://przygodanaukrainie.pl/admin/ckfinder/userfiles/files/murudotarisepukuli.pdfIn PDF document text
    • http://cariboohose.com/userfiles/file/wefigut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=aston+martin+db7+i6+manual+for+salePDF 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_off000101e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E9 19684 bytes
SHA-256: 94e891d7f6d2abb5bfbc23753fc5a1766812bd28d47edc9bffb9dbafd914e159
font_01_sfnt_off0001352a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014d41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D41 10952 bytes
SHA-256: f1a0e7c986e3d816bacfa491972d1f3c135151f437417174ff0b2d5977a17506