Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9418c818e59879a…

MALICIOUS

PDF

82.8 KB Created: 2021-09-07 02:16:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 69f39d5062230e8497186b183148f365 SHA-1: ce455020473b6e3ee35f3b9ee342b13c7b5af393 SHA-256: f9418c818e59879afccccacdd0d4cc0a6d0699af4cba6859f2bf047190d4dcb5
236 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious. It contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting it's part of a phishing or malware distribution campaign. The document body, though obfuscated, contains heuristics indicating it instructs the user to execute commands via the clipboard, a common tactic in ClickFix social engineering attacks to bypass macro restrictions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://bharatdarshan.net/rgroup/ckfinder/userfiles/files/99759673032.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/e4c5cba6043d6413f8d1dfcd958e5951/30059156785.pdfIn PDF document text
    • http://gennarimaq.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5eafa12a8---78143774238.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/60583489670.pdfIn PDF document text
    • http://jinistudy.com/_UploadFile/Images/file/56895047651.pdfIn PDF document text
    • https://drmiamiconnect.com/wp-content/plugins/super-forms/uploads/php/files/2d715dd5d9b5cfe335176b3dde608612/fulolasusifasa.pdfIn PDF document text
    • http://modelkyujin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3ace242ce---45182419207.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/9a8e765b7e1c89c0cb2f3e9762b86517/26988170391.pdfIn PDF document text
    • http://haithuanphat.com/uploads/files/dovos.pdfIn PDF document text
    • https://confetti-seasons.ru/upload/files/dowupogasukabifuzigarepi.pdfIn PDF document text
    • https://kuepancong.com/contents//files/92881223430.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608daf27b23e0---daniso.pdfIn PDF document text
    • https://bodzlomu.com/userfiles/file/dijet.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/gurixodanobuveno.pdfIn PDF document text
    • https://xn--80aanugxqi.xn--p1ai/admin/ckfinder/userfiles/files/11068954964.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160f4dc0eeb740---filawodawomarowomuje.pdfIn PDF document text
    • http://toshiteriyakiburien.com/uploads/files/50362547616.pdfIn PDF document text
    • https://indikino.com/ckfinder/userfiles/files/1954357344.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/59406836014.pdfIn PDF document text
    • http://stepasidemedical.ie/images/uploads/file/gefofavadawigazoz.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/adf150a6b71295f87bf79374e4861644/nifusokuwizujujubo.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b2b25d920---51749105302.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/95fd1bb5e9b4f8a86f172467f2e6c0d5/vamidulig.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=esp32+data+sheet+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_off0000df10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF10 18116 bytes
SHA-256: da8af82b2f8bc060f9f7442f2effb8c90e9cfcd23184ec0214ed1c9f911f492a
font_01_sfnt_off00010d8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000125a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125A5 10408 bytes
SHA-256: f58d7b1f8d896a177cbab0be94785a9ac02852806b6bda7b735c805e5633afce

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