Malicious PDF — malware analysis report

Static analysis result for SHA-256 576b69ccd448d80b…

MALICIOUS

PDF

72.0 KB Created: 2021-09-08 00:43:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c140013c767eb7ac43e1ba6565b8892d SHA-1: 0aa9a3573f775eb3e588ef05a0a87c1305c796c9 SHA-256: 576b69ccd448d80bf7c64335da74682999cdc3e4bbec1dd2f2009393c68d16cb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The presence of numerous external URIs, many pointing to compromised CMS upload directories or disposable hosting, strongly suggests a link farm designed to obscure the ultimate destination and potentially host phishing content or malware. ClamAV and ML classifiers also flagged this file as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://nomylo.ru/uplcv?utm_term=como+converter+uma+imagem+pdf+em+jpeg
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/88c4c44f149e02423bf544a3cadb94ab/38262759639.pdf
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/c4d206d19bb1f001499f3818bd04ede7/44894357082.pdf
    • http://www.anieliasfx.com/uploads/textareas/file/ragilubaw.pdf
    • http://dolonchem.com/upload/files/donosisejovivepalabu.pdf
    • http://indexone.ru/upload/file/72656754886.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/bc14971682e85423a7e035bba11eed5e/45398814778.pdf
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114fedcdc07c---11884691970.pdf
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/duxumewoxibagugibo.pdf
    • https://consurs.ro/ckfinder/userfiles/files/fagilimemobidogejomi.pdf
    • http://lacasedescaraibes.fr/file/dedosujagusuderikazug.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4288d9e0e---nagatobitajunoropevoxoxa.pdf
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5423aaf233---13140003404.pdf
    • http://langfordfinancialservices.com/userfiles/files/5203618168.pdf
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16072d324dcfdc---rujelesanikasirubak.pdf
    • http://espressobuilders.com/app/webroot/files/userfiles/files/meman.pdf
    • http://associazionemillesogni.it/userfiles/files/69913150136.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/dc2f86cd88e6637ce658fd2aa1954207/tepedixojolusaz.pdf
    • https://saleskerala.com/ckfinder/userfiles/files/vajejo.pdf
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/53656018514.pdf
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0207b42c9---64882766332.pdf
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/93171198698.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b716.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB716 16792 bytes
font_01_sfnt_off0000cf2d.bin
5788af26748d38acc798dbf9ae177a75a4365d1f8ab8e5d86b99b0e88c5c113d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCF2D 11076 bytes
font_02_sfnt_off0000e8c1.bin
b2580c3c3426539fd5d7023ffcc9070d2de684c8542ece410f429f39e542faef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE8C1 16956 bytes