Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea3c485a09fb2236…

MALICIOUS

PDF

72.8 KB Created: 2021-10-07 20:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-07
MD5: 368abb5025ae77acfbebe70808f4c615 SHA-1: 5f2ce6af9edd13d5a25f0ad6abfbd35644a08aad SHA-256: ea3c485a09fb2236aeb18a0e179ea307f03e2b38aab11abe5e362fea574629d5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on compromised or disposable domains, indicating a link farm designed to lure users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware delivery. The presence of embedded JavaScript points to potential exploitation or redirection mechanisms within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://pixomot.ru/uplcv?utm_term=9+in+bible+numerology PDF link annotation
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/ce07f56d814bb00fb34337f6d0bd9be2/19780943861.pdfIn PDF document text
    • https://mollis.rs/files/zotegebovotavanelub.pdfIn PDF document text
    • http://pokemom2.com/uploads/files/nesafuxuvijonum.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/sovunavopokexabe.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/6hgukahuls2rr7vmfdfms975i1/nivon.pdfIn PDF document text
    • https://jeanmarcrobion.fr/userfiles/file/35382348061.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/69200715798.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/sasofufemetunuseja.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/41866299609.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/161385d4cbdc2f---46967043390.pdfIn PDF document text
    • http://airsoft1.ro/files/file/jesulu.pdfIn PDF document text
    • https://aquarell.ro/userfiles/file/zapemelupimafod.pdfIn PDF document text
    • http://chapaconoticias.com/assets/ckfinder/core/connector/php/uploads/files/nawanowuxenuma.pdfIn PDF document text
    • http://pruneau.d2si.fr/fichier_article/file/83011753431.pdfIn PDF document text
    • https://karlholmbygg.se/UserFiles/files/26387332146.pdfIn PDF document text
    • https://turystycznapodkowa.pl/userfiles/file/zugozefepomuxisibumab.pdfIn PDF document text
    • http://asupuro.com/upload/save_image/files/46411147827.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/zosabobu.pdfIn PDF document text
    • https://ubranni.com/uploader/files/vonepobekijolezasav.pdfIn PDF document text
    • http://jualumnitoronto.com/editor/uploadfiles/95557797664.pdfIn PDF document text
    • http://viacaosaopedro.com/www/js/ckfinder/userfiles/files/zasunokujow.pdfIn PDF document text
    • https://marblobath.com/app/webroot/img/files/35309100487.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_off0000bb3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3C 16668 bytes
SHA-256: c1035466aa605f89dc4e02368d18634f16d5df8d61baea4956258950282cf63c
font_01_sfnt_off0000e628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE628 10448 bytes
SHA-256: 81d0830a9bb6b9a964ae6524d1aa3abb1b4e3800996cd1b06068294e0202fe93
font_02_sfnt_off0000fdc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1