Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcd682d49a39c9e4…

MALICIOUS

PDF

71.4 KB Created: 2021-09-28 12:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd40c4e0beac5f9e630dd270886ad815 SHA-1: a5d37cfbb8d134c8fbdd787b1328634ec9354f92 SHA-256: fcd682d49a39c9e43d6a34e3b581c27c024a412ca62b742e429e0dfcbab097ce
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ClamAV and an ML classifier. It also exhibits characteristics of a link farm, with numerous URLs pointing to potentially compromised or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to execute code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 http://aimic.com/userfiles/file/34510574616.pdf In PDF document text
    • https://ymy-tea.tw/upload/files/11925398003.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/72206553329.pdfIn PDF document text
    • https://weishinclinic.com/uploads/files/202109272059229432.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/20314454105.pdfIn PDF document text
    • https://aviseco.ro/userfiles/file/4340076054.pdfIn PDF document text
    • https://zagi.hr/files/nekurori.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/sewesimenudodavusow.pdfIn PDF document text
    • http://chamaeleon-produktion.cz/www/files/file/47294599283.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/42b88b4b810d6a702d366d70cabccf69/gisabuzirivugolisete.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/76057847414.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/konokoxilolekupana.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408fcfd3a62---musogutojajoduxizepemurus.pdfIn PDF document text
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/9lgge5qoc5rjbthied5bggg3jh/14390986408.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/zafotuwixukedijoraj.pdfIn PDF document text
    • http://bikaji.zohukum.com/ckfinder/userfiles/files/74668675084.pdfIn PDF document text
    • http://interiorconsignments.com/media/file/22306647779.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/morowojajade.pdfIn PDF document text
    • http://skrabl.pl/www/rpbd/fck/file/tapujabewi.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/19459076080.pdfIn PDF document text
    • http://sumbulefendiegitimvakfi.com/resimler/files/golunodudekatixesufi.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/f8t2dlo084hg55qc604f609mv7/51544362884.pdfIn PDF document text
    • https://hoya.mobioptika.hr/UserFiles/file/fofikirotivevu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=auto+haptic+androidPDF link annotation
    • 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_off0000b2b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2B9 18160 bytes
SHA-256: 432cdffc72ce45418aec9e76de371ab5609c152817d831432c0bf704904c3ace
font_01_sfnt_off0000e0db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DB 10348 bytes
SHA-256: f778a2fcdd1795a7882cdd20d2fa06251e682fa5281492c32476f76365c35f5e
font_02_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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