Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddaefdb0818eeea6…

MALICIOUS

PDF

74.0 KB Created: 2021-09-18 19:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8d88cf8c09b2a21bede9ed9194f317b SHA-1: 116a73143543f8bec36b6217b49750e4d20953e9 SHA-256: ddaefdb0818eeea6529e2679da73156fdb7bce03da1154697d544d1b58a11386
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://oniceh.ru/uplcv?utm_term=yuyun+betalia+pdf PDF link annotation
    • https://miltonmattox.com/userfiles/file/89376510438.pdfIn PDF document text
    • http://zoekidsworld.com/userfiles/file/51980701411.pdfIn PDF document text
    • https://grandhotelushba.com/userfiles/file/11709184824.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/13667780699.pdfIn PDF document text
    • http://vsrru.ru/userfiles/file/rabuxaxukinulu.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/modamasezogalokepewozun.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/fesipogekozodufowexivuz.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/4037065179.pdfIn PDF document text
    • http://tanphatinst.com/vietkiendo/upload/file/8110228601.pdfIn PDF document text
    • http://wingmanresearch.com/userfiles/files/wevevibafokozosaxo.pdfIn PDF document text
    • http://neoneophytou.com/ckfinder/userfiles/files/79338127269.pdfIn PDF document text
    • http://herfon-machinery.com/images/ckfinder/files/20210918072404.pdfIn PDF document text
    • http://cleannshieldflorida.com/wp-content/plugins/super-forms/uploads/php/files/dd977c234bc1da7ef6bd3b059c7d4a42/79189023909.pdfIn PDF document text
    • https://npkfertilizerproduction.com/d/files/86956760777.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/93d8c8m9d87eiginsccv919q80/70916639733.pdfIn PDF document text
    • https://mysilo.com/upload/ckfinder/files/vikasogovejun.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/mokepefugiwiloragirejur.pdfIn PDF document text
    • http://abwva.com/uploads/files/likiraju.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/dijagarenedafado.pdfIn PDF document text
    • http://genbreedpublisher.com/files/upfiles/file/vevikabatopotolavomirome.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/173568315.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/7310385968.pdfIn PDF document text
    • http://noavarservice.com/ckfinder/userfiles/files/97702158357.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/49i12rucupjsv0tvlr9v0vodq0/naxekupobizaxufag.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_off0000bdd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDD5 10440 bytes
SHA-256: aed6c8426dc61f3ee349da1fef379a33a28c832d3920b208a46765381d313ec5
font_01_sfnt_off0000d561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD561 17220 bytes
SHA-256: 42508b92644fa6563dddd77621e42ce3699cc9751670b77771dba6a48c072939
font_02_sfnt_off00010261.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10261 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1