Malicious PDF — malware analysis report

Static analysis result for SHA-256 89cd46bd80eac39f…

MALICIOUS

PDF

83.8 KB Created: 2021-07-24 07:06:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: df33a33fabe580cff19768be615188bb SHA-1: 36840315599d3811de24f03a60f18480988c04f4 SHA-256: 89cd46bd80eac39f3e657d8a0fc70c415def7cd433c20a1f3bc9f164873ebd19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160824a296ba43---voxafokumoleketejesejo.pdf In PDF document text
    • https://acryl-bg.com/userfiles/file/momalonosanerovib.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/a5dbaf7c620477b77106258212a4318a/52499553538.pdfIn PDF document text
    • http://jonkmp.nl/img/cms/file/45282741327.pdfIn PDF document text
    • http://info56.ru/userfiles/file/40755059830.pdfIn PDF document text
    • http://www.bash.cl/media/file/kofajexag.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/bigivigelabixifoj.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af9c2a4148---36814595840.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f355ac70f8---zefelirenadesig.pdfIn PDF document text
    • https://legacyltg.com/wp-content/plugins/super-forms/uploads/php/files/3641fa3d82e9bb1ad85a83da449738cd/gajijimipevemam.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/e8eb6dd3f6758a60a5e5936bd7a7c58b/34664862109.pdfIn PDF document text
    • http://www.gpkoaee.ru/ckfinder/userfiles/files/63098496602.pdfIn PDF document text
    • https://www.heracles-hotel.eu/wp-content/plugins/super-forms/uploads/php/files/kbunjb7ksv26ra0plg2dll7ech/petizulotil.pdfIn PDF document text
    • https://universitecentrale.net/uploads/FCK_files/file/sifunigibeju.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/jokot.pdfIn PDF document text
    • http://lifestyleufa.ru/wp-content/plugins/super-forms/uploads/php/files/f09645a9908ae50e3d168a5d8294edd7/69823987010.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/42090868597.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/86973826647.pdfIn PDF document text
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bbaa5eccda8---34421850257.pdfIn PDF document text
    • http://18554080.com/userfiles/file/bupigeni.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f155c80398---puduvovedexovuwamomuza.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/togufigaterabaxezekevez.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab9280405ed---giruzedefukegezazomuvuki.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/sawalekimobizisad.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/uvhq7p2vr0c33o3av5m3utat05/numikoz.pdfIn PDF document text
    • http://sjhrz.com/images/upload/File/lesilavirodevinusesum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=software+to+convert+pdf+to+editable+word+document+free+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_off0000e3d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D8 11080 bytes
SHA-256: 711e187fd3929ed35236727bf5d9a2606239c5d9518ea1d92a83fc0911b3e750
font_01_sfnt_off0000fd79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD79 16588 bytes
SHA-256: 240c79d94d8a69b04b818faf29f62263690bec5fac1bba0d354df0cfe8abfe5b
font_02_sfnt_off000128cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1