Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ba734cb46d70bc6…

MALICIOUS

PDF

81.4 KB Created: 2021-09-04 05:54:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3defab04255f1bbd8e452baf64ad1b44 SHA-1: 0be8e5bb0434d708b90506003b1807ae32848869 SHA-256: 4ba734cb46d70bc683ef854c6b7292219fdeaf619fa192d4018d495cbf4d3f3f
176 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal numerous embedded links pointing to potentially compromised WordPress sites and disposable hosting, suggesting a link farm used to distribute further malicious content or phish users. The presence of these links and the overall structure strongly suggest an attempt to trick users into visiting malicious URLs, likely for malware delivery or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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
  • 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 http://yearbookplus.com/uploads/ckfinder/files/12551686574.pdf In PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/pusoxukupexarawepexofe.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/nonuwubenuna.pdfIn PDF document text
    • http://79.170.40.182/boothtastic.com/wp-content/plugins/formcraft/file-upload/server/content/files/160748e0cc68dc---jutomilulirosebex.pdfPDF link annotation
    • http://mygiftltd.com/userfiles/file/34853178354.pdfIn PDF document text
    • https://www.tri-or.fr/tri-or/ckfinder/userfilesfiles/69697122116.pdfIn PDF document text
    • http://wallsfamily1912.com/clients/876683/File/50979601497.pdfIn PDF document text
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a641a3ee6e2---16462738602.pdfIn PDF document text
    • http://naturallabs.de/userfiles/file/40487254572.pdfIn PDF document text
    • http://aliceinformaticasrl.com/user/pages/93999021074.pdfIn PDF document text
    • https://tomclarkvoiceovers.com/userfiles/files/142653016.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50b4da8af---98639132704.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a367ddad203---13607443213.pdfIn PDF document text
    • https://escaletravel.com/userfiles/files/19450133593.pdfIn PDF document text
    • http://119hero.kr/userData/board/file/54556755045.pdfIn PDF document text
    • https://www.indoorclub-informa.com/boletines/img/file/14313050015.pdfIn PDF document text
    • http://rustproofingottawa.com/userfiles/file/jiritibisusefex.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608059b300174---kogujabenisolozun.pdfIn PDF document text
    • https://fmpride.com/wp-content/plugins/super-forms/uploads/php/files/75c2a5352f9a4f6fa33720af36a16a1f/96202078837.pdfIn PDF document text
    • http://www.aqsclimited.com/EditorImages/file/berifinuvedoxadomager.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/sokuwe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=cone+volume+formula+pdfPDF 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_off0000d6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E8 10496 bytes
SHA-256: ab1fbc7184872cf041404a2b301116d633d03b615b8868ab60d893c8174bff58
font_01_sfnt_off0000eec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 18972 bytes
SHA-256: a9ccd2fd0e7bbcffbe52459afcefcf7842bd8ef6707d02efd98b4fd10830d1e0
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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