Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ca199444ef3b0d9…

MALICIOUS

PDF

82.0 KB Created: 2021-09-04 01:59:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 7977013c24fd6e038337a56f05942ed3 SHA-1: c9e5be6257751fb67b68255dcc0044ffa0a96ba6 SHA-256: 3ca199444ef3b0d950d3bedca8c00deba890796176ffc4c2b135bccb949ee2b6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised websites or disposable hosting, indicating a link farm designed for SEO manipulation or to redirect users to malicious content. The ML classifier and ClamAV detection strongly support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://inwebjor.ru/uplcv?utm_term=heron%27s+formula+class+9+extra+questions+with+solutions+pdf PDF link annotation
    • http://mundori.com/js/ckfinder/userfiles/files/puninasoduwurinop.pdfIn PDF document text
    • http://margheritango.it/userfiles/file/nodubu.pdfIn PDF document text
    • https://songhong-thudo.com/img/files/xominus.pdfIn PDF document text
    • https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/3dd265bde5b2305b6bd2fe22a2f2663a/pomiporolosazusitutuma.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead444b15b---zikebalikoletiwurivones.pdfIn PDF document text
    • http://worldprint.su/userfiles/file/bukatadilazodowofosu.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/70609177151.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f50eba1ac6---widibidilomezibitikofona.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac546f0c82e---64714922867.pdfIn PDF document text
    • http://emusicmarket.com/upfile/board/files/pojojitumovij.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/400b905095cadf4ca5b689baca3672b6/73952815781.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c930b8ed7f6---mozopuwamiwofa.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/xuvenusukuzapisitoliki.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/g8lpedg88bq5aosdnkuad6jo7j/gugifa.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/86783171844.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16111bffa0719a---ragilebabupisinovipol.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/nosikuzuverakis.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/wejefolexusegom.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/neliretodelokuba.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/e35f3f859e44c8de386877d4e4d7f8e1/sowepowiwokirof.pdfIn PDF document text
    • http://tsrmvolontari.it/userfiles/files/8552659026.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/renaten.pdfIn PDF document text
    • http://emotionpicturesfestival.gr/userfiles/file/rinatujiwepij.pdfIn PDF document text
    • http://ceskylakros.cz/userfiles/file/58663009773.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c87e16afb31---15950961233.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160719ea87a412---33762931856.pdfIn PDF document text
    • http://cheapmarkt.com/userfiles/file/39627913058.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_off0000d501.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD501 19252 bytes
SHA-256: 83d404cde83b94e4523b25aaba432203122914e6afeb3e8826a77b8d2fc31ff5
font_01_sfnt_off00010670.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10670 11512 bytes
SHA-256: a8d564ddb14ce78a1f354db7c86d431b334040b0715fe3c030e87b78503e1845
font_02_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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