Malicious PDF — malware analysis report

Static analysis result for SHA-256 35d97008e18b24c6…

MALICIOUS

PDF

78.5 KB Created: 2021-10-03 08:49:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 1141d94aa8e326934cb3d3df043998d0 SHA-1: 31126785935d3c70464be60ffba38a16d5858e32 SHA-256: 35d97008e18b24c6200b0e5936cf94057d2cfea5636627fe4aa2e5f12b3f9adb
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://chcial.ru/uplcv?utm_term=pokemon+with+weather+boost PDF link annotation
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/2a07b770605cbb40965a498498dea99e/takezoluru.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/91275467713.pdfIn PDF document text
    • http://radio-salsa.com/php/rs/filesupload/file/83481982804.pdfIn PDF document text
    • https://lemarko.com/userfiles/file/wuwevugemedi.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/161423ace2fb13---sukowukafi.pdfIn PDF document text
    • https://maturana.cl/upload/file/55815684697.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/fegakoromuwemajiku.pdfIn PDF document text
    • http://noithattamphuong.com/upload/files/72391728473.pdfIn PDF document text
    • http://fertilityupdates.com/userfiles/files/gikaxef.pdfIn PDF document text
    • http://cp-1.ru/userfiles/files/kegegiferarozod.pdfIn PDF document text
    • http://autoscuolavalerio.it/userfiles/files/miripibawiforezizolalu.pdfIn PDF document text
    • https://snpwachq.com/files/js/ckfinder/userfiles/files/fatovijotil.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16152ca6ea17a8---16088982919.pdfIn PDF document text
    • http://irinaburmistrova.ru/files/lukinewaziw.pdfIn PDF document text
    • https://tahuacoop.com/cms_gpadmin2015/sgi_userfiles/userfiles/files/fimarejefigaji.pdfIn PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/69110165966.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/zafezunidafutiw.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16159095fa54c8---leluzezed.pdfIn PDF document text
    • http://dejede.com/userfiles/file/gepiwusirububoraxe.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/17869196723.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16134e408280e5---xorifiruxox.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_off0000c030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC030 24268 bytes
SHA-256: 5f34f69ba2774df36b28c2a97d12fde4bec39c548d1e77975e09d3ed7cac03c3
font_01_sfnt_off0000fcde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCDE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F5 10648 bytes
SHA-256: ecf1732e95876dd874637d73965933acb2dd391aadaea09b9459d04dfdf9ffc4