Malicious PDF — malware analysis report

Static analysis result for SHA-256 e13b9d7da4ac3748…

MALICIOUS

PDF

70.7 KB Created: 2021-10-04 08:42:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 8825a40131b97b5e300d87c1bfcb2ef3 SHA-1: 0e04b72f54042c2036c0dfa2daa79d7f09910fd6 SHA-256: e13b9d7da4ac37485224b4d47cacbdb5f6f96bcc792a793c338601ece9cfb8ec
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and link farms, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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=snaptube+download+2020+ios PDF link annotation
    • https://taperagi.com/contents/files/gigukeborozevejokoziw.pdfIn PDF document text
    • http://ls12368.com/userfiles/file/dabozewopiririwamukotubo.pdfIn PDF document text
    • http://8njl.com/userfiles/files/94441404066.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/32606187801.pdfIn PDF document text
    • http://asja.ua/userfiles/file/movoxunaretimoxitowasikiw.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ef65cbb566---rubutemiwanuzal.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/raamgptporc5019nhoqf3so8p3/56169938715.pdfIn PDF document text
    • https://www.benkorner.nl/admin/library/ckfinder/userfiles/files/42999388321.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/baxugasikuvuvotuv.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/kusulegitijatidop.pdfIn PDF document text
    • http://itaxabc.com/userfiles/file/20210916212913_1557090257.pdfIn PDF document text
    • http://indcms.testingmachines.com/images/file/7420307788.pdfIn PDF document text
    • https://www.cdscabling.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142cc3cc414a---23068377072.pdfIn PDF document text
    • http://ankaser.com/userfiles/file/tuzomikebukozat.pdfIn PDF document text
    • http://logicparcel.net/uploadsEditorfile/tamukadisazurazabu.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/nilutizuwoxukupubas.pdfIn PDF document text
    • https://distriparkbotlek.nl/userfiles/files/35185529315.pdfIn PDF document text
    • http://dwallacelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/25227150354.pdfIn PDF document text
    • https://minipowerpack.net/upload/files/43415815863.pdfIn PDF document text
    • https://jordanadams.com/ckfinder/userfiles/files/3823827260.pdfIn PDF document text
    • http://kirakuramenandsushi.com/uploads/files/99308401284.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/lumugipugepunoxipa.pdfIn PDF document text
    • http://ledspectrumthai.com/ckfinder/userfiles/files/neripakika.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_off0000b188.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB188 10928 bytes
SHA-256: 9a719d5f75883b3c25679f057a6595126a1043f9be14e7c245667e3f7b36b7a4
font_01_sfnt_off0000cad0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD0 16468 bytes
SHA-256: 3dfc6341639da98c402077e3154dc571ca04955e019b2074430f67ac416c9d43
font_02_sfnt_off0000f508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1