Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff279fc08d57a76b…

MALICIOUS

PDF

246.6 KB Created: 2021-06-15 17:31:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b30c800599d104c12342c99b8fbeac75 SHA-1: ae50538d720360e6465c8958e5e2271e9cdd644f SHA-256: ff279fc08d57a76b27894b10ff85874c70212f4cee6403acdc465be61ac9cb0b
166 Risk Score

Malware Insights

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

The PDF contains multiple links to compromised WordPress sites, specifically targeting file upload directories, which is a common technique for distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware delivery. The document body is heavily obfuscated, preventing a clear understanding of its direct lure, but the presence of external links to PDF files suggests a download-and-execute attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • 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://philabc.ru/uplcv?utm_term=best+free+indian+classical+carnatic+music+mp3+completely+free+download PDF link annotation
    • http://al-bandak.com/userfiles/file/54474846489.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/98460819140.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ca3414748---79948920787.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/dr8oq1vlq61f4ao57eaeq0pe90/52053439479.pdfIn PDF document text
    • http://transinfosoft.com/userfiles/file/54768233995.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/4730634948.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/je0kd8arj87n90qpp1aa187ia5/govonoza.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/kisama.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a960b812db2---viresetegolaranabuf.pdfIn PDF document text
    • https://dipinkrishna.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084215abfdfb---30215821259.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16079fda69729b---13100092813.pdfIn PDF document text
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/519sdokdhqhf1ojvvpbevplplr/fadixakevik.pdfIn PDF document text
    • http://greer2001.com/clients/e/ea/ea56749d84c1a2d7db36d2c51c833a37/File/delerisop.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_off00036e44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x36E44 6908 bytes
SHA-256: 800a24e23ccfcafdcbcbada5e7f640e2578433b45eaf6f3ee0a269120cfe5542
font_01_sfnt_off000385b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x385B3 5708 bytes
SHA-256: 5c657ee3efd79b35492339f82e2eda99071566cc56422e4db81bffaf9d521dbe
font_02_sfnt_off00039928.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x39928 14820 bytes
SHA-256: 593661dff978758b5137c3fc9cc49e04343edb8ad0b707d732cecbec661b10ee

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