Malicious PDF — malware analysis report

Static analysis result for SHA-256 441d287d0102e934…

MALICIOUS

PDF

88.6 KB Created: 2021-07-05 22:58:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 572db418a3f73dde0bab4986375c4652 SHA-1: e7861bd4e1653cb801b78f74f38127fe3096a0d8 SHA-256: 441d287d0102e9341cd206e52312ef8dd8252e7fcd3886c95d768a7035af187c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm. The primary purpose appears to be directing users to potentially malicious external sites, likely for phishing or further malware distribution. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://chcial.ru/uplcv?utm_term=thursday+morning+images PDF link annotation
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf97d38683---xilogerefaj.pdfIn PDF document text
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1606f683a9942b---67571728491.pdfIn PDF document text
    • http://anhuizpyy.com/upload_fck/file/2021-6-20/20210620062129514131.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/54108039197.pdfIn PDF document text
    • https://c4ir.ae/wp-content/plugins/super-forms/uploads/php/files/la5o1v5m97j69993phmer8sao2/4379857990.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1608a5bf4e8574---31720160412.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c56e4234bd6---12122666491.pdfIn PDF document text
    • https://laihouston.com/wp-content/plugins/super-forms/uploads/php/files/857839cb6bdce39cf3a0f9df4331f24d/95284158369.pdfIn PDF document text
    • https://www.sanier.pl/wp-content/plugins/super-forms/uploads/php/files/9vuhckcik6bdofbvrbj9hjjg8n/5264120871.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/robefifakimufudalosinavad.pdfIn PDF document text
    • https://cncostruzioni.com/userfiles/file/99286051023.pdfIn PDF document text
    • http://objetivovender.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bdc9201c15---5144621773.pdfIn PDF document text
    • http://flemingfamilies.org/clients/8/8a/8af36a28baf44bfc7b8a7004fb4eaede/File/jibax.pdfIn PDF document text
    • http://domeinbeverdonk.be/assets/files/file/15555951591.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/kujozuj.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/gejejugukivozogusan.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/6501214551.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e3f5cbda7---90345822678.pdfIn PDF document text
    • http://alsumiri.net/wp-content/plugins/super-forms/uploads/php/files/438ab820d84506710c07897ba2d4515f/32228028470.pdfIn PDF document text
    • http://birnagarcollege.in/userfiles/file/91183304672.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/5f3b1671e2cedcf92db07e798d67882b/lotezobuk.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/gomibelogogerezitigulesa.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e036e88f42---bikutatuwikibixofimuzin.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_off0000f9f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001120c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1120C 10728 bytes
SHA-256: 88bd2c1e55336bb10888b799582a417f4bd92c33639fa91e421cab5f9faa453b
font_02_sfnt_off00012a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A50 16732 bytes
SHA-256: 5cbeb9bc00e1124b8fc7c755efc6071ef148d5cb12a97c3e48d2c23f377e5514

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