Malicious PDF — malware analysis report

Static analysis result for SHA-256 e50c1c76a4546832…

MALICIOUS

PDF

95.5 KB Created: 2021-09-04 01:15:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 474315983881b9df50f811d7ede3d9c1 SHA-1: cb834f28a67c1ea8149653dd0769d50000d94ab3 SHA-256: e50c1c76a4546832e97f77e678d9cda306d984f0e7d50b425efdd070f17de797
236 Risk Score

Malware Insights

MITRE ATT&CK
T1204.002 Malicious File T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it uses social engineering tactics, specifically a 'ClickFix' lure, to prompt the user to execute commands via Win+R or a terminal. This suggests an attempt to download and execute a second-stage payload, bypassing traditional macro-based execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • 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 http://werder-ritter.de/UserFiles/File/farudojexokiludixugel.pdf In PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ab58b02e548---15720798959.pdfIn PDF document text
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161008e4c2528b---49579727937.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9e9f6c722c---dimuxujapimexi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/mopixubawigafajuleliruwod.pdfIn PDF document text
    • http://aaykpn.com/uploads/editor/files/jebaf.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/fazepoxenizororudojo.pdfIn PDF document text
    • http://4grd.com/cmsimages/file/43094749809.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/56477950356.pdfIn PDF document text
    • http://ccshecea.org/upload/files/31538871538.pdfIn PDF document text
    • http://technestudio.eu/userfiles/files/biriloxewuralulugot.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/19858227561.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/88575648248.pdfIn PDF document text
    • https://mosoptagro.ru/wp-content/plugins/super-forms/uploads/php/files/e1f85325f4c8a6b1a0d39cd0ab75c7c9/25968965640.pdfIn PDF document text
    • http://sskj.pl/userfiles/file/5383100332.pdfIn PDF document text
    • http://www.caribbeandentist.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc9abc4d0d---nesavurilikazatow.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/vtuv647so4rombfh8omkt28jh7/29298929800.pdfIn PDF document text
    • https://almuhja.net/ckfinder/userfiles/files/nejagonuxeker.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/12110148954.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/jiwuxuwifolari.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1610563bb0f29b---35445903626.pdfIn PDF document text
    • http://chuanghuilaw.com/filespath/files/20210901090349.pdfIn PDF document text
    • http://studioboscono.it/userfiles/files/tokin.pdfIn PDF document text
    • http://scro.ru/pic/file/vopomitarukem.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf47c7eb015---zubug.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=safety+data+sheet+for+chemicals+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_off00010cc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC1 19080 bytes
SHA-256: ec7d92e5cdf7472f39f8e3ce3ad70db46f63b7dc5993f0cb4991aa4c515c35a6
font_01_sfnt_off00013f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F16 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001572d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1572D 10972 bytes
SHA-256: 643139e2b783a1058e82acff56afa4bb156132558be94a4962a1785fccad2a1c