Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce89771b5df19e61…

MALICIOUS

PDF

81.3 KB Created: 2021-09-01 14:26:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8b2071142dd9815a5a1658edb500b9c4 SHA-1: 51c84b63e86e06bbd0d1f1a0c8e626276d3ae71a SHA-256: ce89771b5df19e61b52d9e35c8ba2096e9fe1a63ee7fbc25038ca902674654e1
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users. The heuristic 'SE_INVOICE_LURE' indicates the document's content is likely a fake invoice or payment request, intended to trick users into clicking the malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9805

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://jcmimoveis.com/userfiles/file/73170683908.pdf In PDF document text
    • http://allgeology.ru/ckfinder/userfiles/files/88896514852.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/45fb0812858d918379a667b458fdeb9e/83892473106.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210829083009_2003602104.pdfIn PDF document text
    • https://www.asoriofrio.org/ckfinder/userfiles/files/bulufoxeta.pdfIn PDF document text
    • http://preprod.app-nomads.com/ugecam/admin/ckfinder/userfiles/files/1561309796.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/6058583725.pdfIn PDF document text
    • https://forumsevens.com/images/file/pasujanaxuv.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d2165e6769e---44416471247.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b61e9d30a9d---jafiz.pdfIn PDF document text
    • http://bapassamarinda.id/assets/ckfinder/core/connector/php/uploads/files/51755845715.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/84865541202.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/vufaxuvofodital.pdfIn PDF document text
    • http://zeguvietnam.com/uploads/ckfinder/files/tarodixeki.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/37027790962.pdfIn PDF document text
    • http://dobre-jaja.com/Upload/file/73183071034.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608d157526f2f---70634323888.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160848ab96276f---niwise.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/0poc5vcagh8jl1tjmd8qda9tbm/38876025231.pdfIn PDF document text
    • http://songiadabinhphuoc.com/upload/ck/files/23823148057.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/e7bb8fcb4e93d11f827286d4cefc29d3/97343387326.pdfIn PDF document text
    • https://northstarexecutivesearch.com/wp-content/plugins/super-forms/uploads/php/files/34d0726c0f26400c5b6bf37342fb5b75/bilefewif.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/9bc8446fa5d71027cccd92204755f037/45069212681.pdfIn PDF document text
    • http://osteriailgalloelinnamorata.com/userfiles/files/dadig.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608412fd09b9a---15410858778.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/wosuvevitimudoj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=single+wide+trailers+for+rentPDF 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_off0000d8b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8B7 17748 bytes
SHA-256: 177412e68696fde2a021db71932e6dc170c4753e2a2fae9efd70c0bdde856682
font_01_sfnt_off000106bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106BC 10692 bytes
SHA-256: 36fa6835d4972cb608f97838437f354255940400c9d3b82cac34cd2237dfd66a
font_02_sfnt_off00011f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F38 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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