Malicious PDF — malware analysis report

Static analysis result for SHA-256 610d32e8e41a9b03…

MALICIOUS

PDF

79.2 KB Created: 2021-09-07 19:08:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 236288cc69789d922bdc4fcfbd7489e3 SHA-1: c489da187b72dd5a93e83df577a12d7102d3e43c SHA-256: 610d32e8e41a9b030a222a18e7481d15b21be0e7ea21b1eba4fef9fa0da038bf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file contains embedded JavaScript and is part of a link farm hosted on compromised WordPress sites. The heuristics indicate it's designed to redirect users to other malicious PDF files, likely for phishing or to download further malware. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/1f0f7b3b9a7f198097ffcd99d3656630/xipipivefabitewe.pdf In PDF document text
    • http://centrons.com/uploaded/file/195541901160db646cc5737.pdfIn PDF document text
    • http://geoplan.su/userfiles/file/78288519200.pdfIn PDF document text
    • http://markasib.ru/ckfinder/userfiles/files/kibivipagave.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/aat64r1tbgve3v9oftbi8119i3/zagilakokurifiwigogiwasa.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/xupopawufefamaxef.pdfIn PDF document text
    • https://www.zolmedis.lt/ckfinder/userfiles/files/57445568296.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/60292520676.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/05edc018a673a0276f40ab8729e0d8ae/mokupujipozaxotijer.pdfIn PDF document text
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/nuaqshmif71ne20ccg4e0v8t14/surizimeladafanix.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/69027845562.pdfIn PDF document text
    • http://apvn.info/userfiles/file/togibozawofaga.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c2467fd65a3---lemixowewubavudurugivugo.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160cd1bd7b6547---laluris.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1608222419b069---nowewolavejin.pdfIn PDF document text
    • https://renteci.com/imagens/file/1797697213.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/22f10dbac437e97c1195850bc74f99f5/76189187722.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e37d18396ae45aac5ac9cbb312c66591/74239852320.pdfIn PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/16225747665.pdfIn PDF document text
    • https://vietnaminsight.biz/ckfinder/userfiles/files/12258729047.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160702cbe5df49---pipuvisekaruzili.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/5h9fdqlsn4kpq8ugq3aoi75fe5/50786692936.pdfIn PDF document text
    • http://villa-carlshorst.de/sites/default/files/file/ladovudibisenalozubivef.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a3380f61f21---zipufozafadasabon.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1609acb1a74731---12558391395.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=hot+air+generator+design+pdfPDF 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_off0000d17d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD17D 10616 bytes
SHA-256: f11c60e9c57544dcf937dc72db36371e31286a6b8cc5a9d4ee0fcfc43f26bb9c
font_01_sfnt_off0000e99f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99F 17700 bytes
SHA-256: e45f321780ff1d6d4c934d49ff8b8ce7295ab1b43de8cfc812c6af2a3cc9fb65
font_02_sfnt_off00011794.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11794 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1