Malicious PDF — malware analysis report

Static analysis result for SHA-256 626ef63e32fdfd2b…

MALICIOUS

PDF

81.7 KB Created: 2021-09-07 13:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bd67a9124f15aad216b27bd4022c6b8f SHA-1: 055932b10a91e53edbe0db79908c2d27b5b8b6c1 SHA-256: 626ef63e32fdfd2b78c7618a25fad759ef7cb736b7caf5e0d2656c2951d273ee
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution attempt. The file contains a link farm with numerous URLs pointing to compromised WordPress sites, suggesting it's designed to lure users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it leverages embedded content or exploits to redirect users, aligning with T1566.001 (Spearphishing Attachment) as a likely initial access vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=badan+usaha+agribisnis+pdf PDF link annotation
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d9eacdcca8---82848716914.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/4333aae211592c6adacd8640d8ff9086/48332857500.pdfIn PDF document text
    • https://truck-diagnostic.ru/wp-content/plugins/super-forms/uploads/php/files/b5cda78a0a7bdae4b6850e41cfac2a09/29578254507.pdfIn PDF document text
    • http://cristal-in.fr/userfiles/file/moxetagovufomatilo.pdfIn PDF document text
    • http://www.medicalalliedtraining.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082c6f723de5---1563178056.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/16116686be9649---737563144.pdfIn PDF document text
    • http://baobianhkhang.com/upload/files/senufuzatorazef.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/59547692325.pdfIn PDF document text
    • http://f-okinawa.com/img/tmp/files/88367132589.pdfIn PDF document text
    • http://koetec.com/home/~ptow/public_html/ckfinder/userfiles/files/segere.pdfIn PDF document text
    • http://midlandhigh79.com/clients/866549/File/vojipuzavezixonekopelos.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a0fe54488f2---gibadepapikuf.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611c83022b53b---67905499389.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16083fea85d35c---bugitilixaka.pdfIn PDF document text
    • http://lblussana.it/images/file/2141034294.pdfIn PDF document text
    • https://media-get.ru/userfiles/files/xinipixe.pdfIn PDF document text
    • http://fiumevivo.it/userfiles/files/3253672531.pdfIn PDF document text
    • https://gastrotest.co/ckfinder/userfiles/files/32339639597.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/naxafix.pdfIn PDF document text
    • https://matras-matrasych96.ru/admin/ckfinder/userfiles/files/tolopu.pdfIn PDF document text
    • https://biogenetixpharma.com/ci/userfiles/files/99579919072.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_off0000e01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01F 10672 bytes
SHA-256: b7425df0f51dcc35ddeda278d24c7519cb9fd09fec21b2c0c52e761d98dd49d2
font_01_sfnt_off0000f7fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FD 15952 bytes
SHA-256: 8dd3c175f72d11b18119007c5ea87f528d67d8fa66c220f365b6ac091848bc65
font_02_sfnt_off0001216f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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