Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5b64baadba5ac9c…

MALICIOUS

PDF

86.4 KB Created: 2021-09-13 01:21:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ff94ff63e9860254a2a02661a2c2179 SHA-1: 147f1c1fcabfd24800cdbb974e583f4ae2f65369 SHA-256: b5b64baadba5ac9c342109dfb356334f71f3720a38b02cfe97461ab0e700de6b
204 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and multiple external links, some pointing to compromised WordPress upload directories. The critical heuristic 'SE_CLIPBOARD_COMMAND_LURE' indicates the document instructs users to copy/paste content into a command-line interface, a common tactic for executing malicious commands. This suggests the document is designed to lure the user into executing a secondary payload, likely downloaded from one of the provided URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://immo-macedo.lu/userfiles/files/taxegofulinapuwenatetiza.pdf In PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135eaf24e683---46994160539.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/kv5b0gj66t8nuslmc3gs8pnaa5/bisebisun.pdfIn PDF document text
    • http://vako.vn/app/webroot/uploads/files/luwoja.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/96014190920.pdfIn PDF document text
    • http://cobmedia.hu/include/sojipojebu.pdfIn PDF document text
    • http://sk-massimo.com/js/upload/files/33713871677.pdfIn PDF document text
    • http://spy-military-labs.com/userfiles/file/tigaxugoxezivureko.pdfIn PDF document text
    • http://rbc-bezorgdiensten.nl/upload/49969358872.pdfIn PDF document text
    • http://besttailor.info/ckfinder/userfiles/files/fipavapolagigebolow.pdfIn PDF document text
    • https://lostfoundglobal.com/userfiles/file/mulekoxapoditenorejixove.pdfIn PDF document text
    • http://portamarioarchitetto.eu/userfiles/files/54378675466.pdfIn PDF document text
    • http://vinaktv.com/storage/ckfinder/files/34013077858.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/r25g6thucm69efo75u67ibik1r/gapowedetuxevebunefipew.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/82392003617.pdfIn PDF document text
    • http://yjccnc.com/upload/files/1907195561.pdfIn PDF document text
    • https://keongracun.org/contents/files/76466844657.pdfIn PDF document text
    • http://phongkhamthienhoa.org/images/files/23350535530.pdfIn PDF document text
    • http://gtlitalia.com/userfiles/files/musizatekorasut.pdfIn PDF document text
    • http://leadingedgecorporate.com/user_images/file/18226922356.pdfIn PDF document text
    • https://preciseenergygroup.com/media/4540678679.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/tipugiwiv.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/6f1f47590b611ef64c98bff18782f252/26715305136.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fefd3cc855---xoxuxek.pdfIn PDF document text
    • http://ktcz.eu/files/files/ninalopogubo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=aosp+email+appPDF 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_off0000f00a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF00A 17440 bytes
SHA-256: 7e98b215550c3552d4b2f37cd696938718b0bf79e4bd5bd6503ac7c8cecd9230
font_01_sfnt_off00011d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001356c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1356C 10092 bytes
SHA-256: 09580715bf9c768a603e9995d15994c38c553775ed8d3274db520cd9555637e9

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