Malicious PDF — malware analysis report

Static analysis result for SHA-256 894ccb9c8caef3df…

MALICIOUS

PDF

83.0 KB Created: 2021-09-12 18:32:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 040448f81749780005c60276e848e1ce SHA-1: a93274eb825e0cb72dc1e809d1fda15c307dbf82 SHA-256: 894ccb9c8caef3df8d36fd4f90839f60d9165e4ead00c84ff63cdda8ca8ad95c
204 Risk Score

Malware Insights

MITRE ATT&CK
T1059 Command and Scripting Interpreter T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and numerous external links, many pointing to compromised WordPress sites. A critical heuristic identified a 'Clipboard command execution lure,' indicating the document instructs users to copy and paste commands into a shell. This strongly suggests the PDF is designed to trick users into executing malicious commands, likely to download and run a secondary payload. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://wastran.ru/uplcv?utm_term=how+to+find+installed+apk+on+android PDF link annotation
    • http://originalcheck.it/public/img_admin/file///ganuketu.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/baa3f1b7c8c776eea43036c0b02ddf31/lalosodiguluguvibuv.pdfIn PDF document text
    • http://www.w.radeton.cz/ckfinder/userfiles/files/49602565123.pdfIn PDF document text
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/meovegedgmnrsssv0i95pgkvn6/wavokagerimututubepi.pdfIn PDF document text
    • http://space-edge.com/upload/files/73016279843.pdfIn PDF document text
    • https://seerupit.dk/assens/file/farelixofupuruleneg.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/25772241061.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/degetikolevafej.pdfIn PDF document text
    • http://kftchem.com/upload/files/regunawu.pdfIn PDF document text
    • http://pnmanagementsolutions.in/uploads/45392411406.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/vuxuzalitereviwipemusuj.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/60142235764.pdfIn PDF document text
    • http://investgeorgia.ge/userfiles/file/xafivubuji.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/k5ikvh1ugbvr7quibtpd7pk3h4/21420818134.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613354dc1d24e---3826659833.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/e8405d9f89a8738fe9d5deca259af161/fozakofodijurabo.pdfIn PDF document text
    • https://likeevent.it/writable/public/userfiles/file/75660329388.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/7dd8ddf5a7b46a325e74419726a4e1a6/91688229327.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/99390687229.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/mabegotevixezore.pdfIn PDF document text
    • https://musikkursus.dk/userfiles/file/13712430906.pdfIn PDF document text
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139991b96130---63523973823.pdfIn PDF document text
    • 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_off0000df4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF4F 10660 bytes
SHA-256: 2943c433bac1f34a701f6b0927faef7eda2e14da2ea26823bd407a11e3074e95
font_01_sfnt_off0000f7da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FEC 17816 bytes
SHA-256: 70f74598cee0fe95552f0eb636d98d7b6af05fdbbba8b2782732f1d371c51ce7

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