Malicious PDF — malware analysis report

Static analysis result for SHA-256 b273be36c8455c66…

MALICIOUS

PDF

82.4 KB Created: 2021-09-03 19:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: dde7bf552aafa674d3bf70a5e5cefef8 SHA-1: 508aec6fce6bd03171e7d848ca726b7c8f9de0b4 SHA-256: b273be36c8455c665297ee756ace4149d4b4f49ebfa776070e279808423498b2
196 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, likely intended to trick users into downloading a secondary payload. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' suggests that the user might be instructed to provide a password for an archive, a common tactic to bypass gateway security. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/d02d253a9f5aad73e7f8c1e3fa3f40dc/xenukutolagaz.pdf In PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/2dba6d560eba0da6368e14ce5e97f53e/vofidebujiwosexubid.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1611c1cd6ce014---74841006101.pdfIn PDF document text
    • http://mirandatutoringcentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16087cf9607315---rewolutukexisegufexupejos.pdfIn PDF document text
    • http://siembra.me/uploads/files/lofesotimewiwekezako.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/ranudagofanavu.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160ee7c7acb4a3---fajupusisiwusivog.pdfIn PDF document text
    • https://saunadlaciebie.pl/userfiles/file/fumajowobexajix.pdfIn PDF document text
    • http://www.sempresaude.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb1c553259---57538736354.pdfIn PDF document text
    • http://doktor-okonski.pl/uploadimg/file/79393658215.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/uvc4mlgd6rq2ol4og3qjhlo2kq/27705864727.pdfIn PDF document text
    • http://vipnjl.com/userfiles/files/84437842119.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a0cde1952---39298373955.pdfIn PDF document text
    • https://www.hontoys.com.au/wp-content/plugins/super-forms/uploads/php/files/gjobhavbhcslescntt8np62bgs/potoboto.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/sofuxefujibubajoligipo.pdfIn PDF document text
    • https://kolkatanagariksammelan.org/ckfinder/userfiles/files/81805271314.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/08d2164eea7746b136adde0d7f1316ad/pozuwukopolubatirelozox.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/3961673451.pdfIn PDF document text
    • https://khanikango.in/file/42908307554.pdfIn PDF document text
    • http://ipjanah.ir/wp-content/plugins/super-forms/uploads/php/files/fpj46i8ijhke605bnts038d327/tutidakipufaratovar.pdfIn PDF document text
    • http://agriturismocorteerbatici.it/userfiles/files/2690832305.pdfIn PDF document text
    • https://www.avantagesapp.com/uploads/files/23578968862.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/mhq6kai8kmic6l2t0caljqprfd/lazasabugivuzi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=descargar+lector+de+pdf+que+no+sea+adobePDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3D 11088 bytes
SHA-256: 3838045fe131db96685581809d3c8989e8936e5df8d957b539063178d1e40782
font_01_sfnt_off0000f386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B98 19112 bytes
SHA-256: 2c8d617e222629c5ddc95f880a82d580dfc0b0952b783b3010fa7a7ef50cea39

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