Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4f831cfa7b3c31e…

MALICIOUS

PDF

84.1 KB Created: 2021-06-25 14:50:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: a5a6b95147980c69062b1e2d1f41b79e SHA-1: a3d6c79dff7faead0bac8a489d0b1674bf1075aa SHA-256: c4f831cfa7b3c31e6faee098d6527986fe0423ef39d3845428e7a59b19bac649
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites hosting PDF files. This suggests the PDF is part of a link farm designed to redirect users to potentially malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/2e3fa08bf9bdbbcab20584ceee23743f/wilalozitugiteru.pdf In PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21e9f56030---timusewuxufare.pdfIn PDF document text
    • https://maydangson.com/vietkiendo/upload/file/59010925390.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16099ba0deb28b---14061389331.pdfPDF link annotation
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/494stpu35rh0dud2f6in85qnrm/73099524032.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/lubekubijisesakinafe.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/soucdk69k23sa3k5inf80fkdml/dabixubo.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/zotuwumax.pdfIn PDF document text
    • http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/gamumopexe.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085e578509b8---11263291336.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace1cf9cba8---18360497150.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cb38a4d0a---sunotu.pdfIn PDF document text
    • https://wildarium.com/ckfinder/userfiles/files/mivetudalejiwobotusirewar.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f9d637977---44422530874.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/69152719393.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/28047358552.pdfIn PDF document text
    • http://englandmatchshirts.com/assets/file/xorotetaposeminowebol.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=primary+consumer+definition+biologyPDF 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_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 16336 bytes
SHA-256: 51893566b24bd64575f6097b0ea0079210bc026fed5da30a918582c23e6ffe06
font_01_sfnt_off00011181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11181 11176 bytes
SHA-256: 1b02a3ce053a3cb7839e47d8e617d88068ee15eb02b00a86d23378e35c7577d9
font_02_sfnt_off00012b77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B77 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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