Malicious PDF — malware analysis report

Static analysis result for SHA-256 4426a281fd367cf5…

MALICIOUS

PDF

84.1 KB Created: 2021-09-08 17:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 591aec9a89811b47f897f258b287d493 SHA-1: 0414c5e11ba4afbd60d6e225dc1269375889cfff SHA-256: 4426a281fd367cf5d3d9adf8d17907091f93bb553c9890c5f16e320cdfceadf6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as malicious by ClamAV and an ML classifier, and contains embedded JavaScript. It also functions as a link farm, pointing to multiple compromised WordPress sites and disposable hosting, suggesting an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the redirection to these malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://synerhu.ru/uplcv?utm_term=manual+de+marca+basico PDF link annotation
    • https://sdyh.gr/wp-content/plugins/super-forms/uploads/php/files/kpps7kg8lfmbsli06b5k7l94v3/76139722831.pdfIn PDF document text
    • https://giaiphapthietke.vn/media/file/files/20249536913.pdfIn PDF document text
    • https://nezrenpin.com/calisma2/files/uploads/65775591101.pdfIn PDF document text
    • http://thietkewebsite.btccorp.vn/uploads/files/kekagel.pdfIn PDF document text
    • http://take114.kr/FileData/ckfinder/files/20210907_611478ACF0CE27E8.pdfIn PDF document text
    • https://bushregenerators.com/userfiles/files/pogubikaj.pdfIn PDF document text
    • http://teresachild.com/upload/files/senejamalo.pdfIn PDF document text
    • https://www.agro-zavod.ru/app/webroot/js/ckfinder/userfiles/files/76564183342.pdfIn PDF document text
    • http://frickcontrols.com/uploads/files/mozuxumufabulegamejik.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/rekimelir.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/54567813011.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343ab9241a2---86326678043.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109080753358804.pdfIn PDF document text
    • http://kdekdyjak.cz/data/49885013547.pdfIn PDF document text
    • http://mvdeastudio.it/userfiles/files/mapuviladarukolejigagoxoj.pdfIn PDF document text
    • https://slezanie.eu/userfiles/file/tisedigeresak.pdfIn PDF document text
    • https://shriramsteels.in/public/ckfinder/userfiles/files/7211527387.pdfIn PDF document text
    • http://gldbirdgel.com/user_img/files/busenupofolex.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/70167667501.pdfIn PDF document text
    • https://ukmalayalamnews.com/userfiles/file/18231390227.pdfIn PDF document text
    • http://topaslt.com/userfiles/file/muravosuponategenekudo.pdfIn PDF document text
    • http://www.sauminandy.com/fckimages/file/roxogesepibavukixod.pdfIn PDF document text
    • https://www.beadvised.co.uk/wp-content/plugins/super-forms/uploads/php/files/9ca1a202e480124f4ce98f85bc0a406a/wilopukal.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161351c76618c0---61520072605.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_off0000df65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF65 10668 bytes
SHA-256: 9778a571004d37a17a94d195468669a86156d195361a1544a45af501ed62e50d
font_01_sfnt_off0000f7b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 19152 bytes
SHA-256: 7c5133d609b4a8881a1fab631504bbe84fe2eda88935176cc6551879b8cef260
font_02_sfnt_off000128fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128FD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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