Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccb9bf1d3f16f899…

MALICIOUS

PDF

88.7 KB Created: 2021-09-11 03:11:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 0ea6790b9fb5a66eb840617fc7d9bca8 SHA-1: b2182c47d3528f88a8b17304ff2f319964d91de3 SHA-256: ccb9bf1d3f16f89976f222a8e2ce0eef62418dfe15e5d6b837962078dcd4e26a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9764

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://garglob.ru/uplcv?utm_term=fifa+2021+apk+data PDF link annotation
    • https://123natura.com/stockages/files/98233477905.pdfIn PDF document text
    • http://stin-verdon.fr/assets/Image/files/63070240767.pdfIn PDF document text
    • http://cbcom.fr/ressource/site-image/files/51874428985.pdfIn PDF document text
    • http://novosib-sport.ru/ckfinder/userfiles/files/71000378128.pdfIn PDF document text
    • https://beautydent.hu/editor_up/60055387581.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/78470113179.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/85149737218.pdfIn PDF document text
    • https://jechrina.gr/FCKeditor/userimages/file/negojobidugixo.pdfIn PDF document text
    • https://catequesisnavarra.org/guiarte_userfiles/files/wikifofilibibena.pdfIn PDF document text
    • https://oreopay58.com/ckfinder/userfiles/files/256507128.pdfIn PDF document text
    • https://xnkvinatimex.com/uploads/files/pevukidefafax.pdfIn PDF document text
    • https://kawanmto.info/contents/files/kusapi.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a9624ac533---72902681018.pdfIn PDF document text
    • https://marciasmithconsulting.com/wp-content/plugins/super-forms/uploads/php/files/a3716fcb9434c8a881c8bdd40984fe54/82937397450.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/guzisebepozulirijasurebuw.pdfIn PDF document text
    • http://cowmoo.org/ckfinder/userfiles/files/14413593942.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136e6c2df48b---12735628602.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/juctlqgsnejmjncibh7071tcl3/sivafek.pdfIn PDF document text
    • https://namhunglogistic.vn/site/files/kifowazagi.pdfIn PDF document text
    • http://cetis156.neutronds.com/assets/js/ckfinder/userfiles/files/vimasuzesoperivefoziwupo.pdfIn PDF document text
    • http://yeongwonenc.com/userfiles/file/19106839765.pdfIn PDF document text
    • http://thermcom.cz/userfiles/file/97622708322.pdfIn PDF document text
    • https://traicaygiasi.com/Images_upload/files/xinedasoseko.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/bigozowokufodejomo.pdfIn PDF document text
    • http://www.thunderesp.com/ckfinder/ckfinder.htmlfiles/zipemagikijitazo.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/44878477042.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000105d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D7 2032 bytes
SHA-256: 09cd6691fbbb1627d0dfc7da6220768119224cc7e55eca7214a61afd6cffd665
font_02_sfnt_off00010f31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F31 10184 bytes
SHA-256: e592070e581e2b49993839fa8e037878576d1e983086fe2df1081982d2743707
font_03_sfnt_off0001262b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1262B 17484 bytes
SHA-256: 5a676c70131842a366c367cd1ef8376ae9aaafb4c3fdf21872399777ec453a62