Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c241219e576803d…

MALICIOUS

PDF

155.9 KB Created: 2021-06-17 22:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 40230aac552ab89910c2b37a14dd8b9d SHA-1: 2b509b566b58cc1a99dd69e08f8d8109b3c1fb5c SHA-256: 9c241219e576803d986f7d3c8daecdbb7f7c767bb15d574a26a7ee305bd0f575
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and disposable hosting, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://smidgel.ru/uplcv?utm_term=all+star+battle+jojo+pc PDF link annotation
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/isfocm2joh9oc628i0lklrcjn5/duwubawofaxis.pdfIn PDF document text
    • https://dursunguney.com/userfiles/files/99576031285.pdfIn PDF document text
    • https://activepymes.com/pub/file/26310241918.pdfIn PDF document text
    • https://majorsagilekvaros.hu/uploads/file/37113783098.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/589kpmoh73mgt0eioo0pvhd5i1/vopagakixadowunakazogosi.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/99596398990.pdfIn PDF document text
    • https://personnelcle.com/userfiles/file/37548643199.pdfIn PDF document text
    • http://cargo3030.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1608c8f3a31d8c---kivibune.pdfIn PDF document text
    • https://shinyjewellers.com/wp-content/plugins/super-forms/uploads/php/files/gvkvpis5di2ootfur8f5cf5d68/10107586953.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/1c295d390eb4f8a26dd10dd44d83a762/bagopojudufuzewaxada.pdfIn PDF document text
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/45e7fcd81aefd279dcfd2c04975e0061/kamilivipa.pdfIn PDF document text
    • http://www.gradur.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160988e001f565---fibezeturodag.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160800c2d2e9e1---vonitugigoloti.pdfIn PDF document text
    • http://chatfieldfarms101.com/userimages/tolev.pdfIn PDF document text
    • http://leap-egypt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f231a7824---ponotezil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C778 30856 bytes
SHA-256: 586ab509a667c620e378b3fdd0de469f60fe21fba8dd9e5383d7b37a34fff0a5
font_01_sfnt_off000226d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x226D9 5132 bytes
SHA-256: 0d3fa7ec8a83ab60d3c0db14dbb23874f7310a50e3550590cc3f16dbcd72a3bc
font_02_sfnt_off0002385d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2385D 12344 bytes
SHA-256: 61233360bcd2bff766c5dd795174859a69c2e6d914ad8724284a3d84df042a39