Malicious PDF — malware analysis report

Static analysis result for SHA-256 924fc6b0ef9d6451…

MALICIOUS

PDF

78.3 KB Created: 2021-06-18 22:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 09d90a0a1320c5654ec50d74cea4d1ae SHA-1: ce44125aa425366726b0ef28d1a73aaad04badaf SHA-256: 924fc6b0ef9d6451c9f1594d305fd37d359034982c4008e97b6a5267abf6bb33
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. The primary purpose appears to be redirecting users to potentially malicious content, consistent with phishing or malware distribution schemes.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 http://aostavet.it/userfiles/files/detajebasukibataxejenafit.pdf
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607248e00b5e5---tagasinuwiburazuwurikoli.pdf
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160b75d9c8020f---37390105241.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160820fc017ec7---30689731091.pdf
    • http://nessium.fr/userfiles/file/25702074914.pdf
    • http://jhferry.com/data/fckeditor/file/%5C/sabixunalavafosoze.pdf
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/50hqsn72o7c1im5kmd1k5djvs5/59330697802.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/e347b9c4c4b13471c47241e78bf59446/lozowaraxagisit.pdf
    • http://www.aportecnica.com/imagenes/editor/file/24188866656.pdf
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/c35b5196ede2470062c9d34375b3d5a1/68703206975.pdf
    • http://aucoindeshalles.com/menu/file/kufasomuwopeg.pdf
    • https://www.hamburgeriaagricola.com/wp-content/plugins/super-forms/uploads/php/files/f05qo1kjp9u8jetpmlqmsruelf/pinepipenubipumivufez.pdf
    • http://mfcwestenkwartier.nl/beta/userfiles/file/67712857489.pdf
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160862e6c9ec59---wurumikalaxoxigun.pdf
    • http://arcomproltd.com/userfiles/file/37698601982.pdf
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/16093a9377ffd1---30287730239.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=christmas+hymns+and+songs
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e8bb.bin
fb17dbce0bbe224524e641525439fcd79927bf4a4ab45d2cdaa3862a7108a3d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8BB 5000 bytes
font_01_sfnt_off0000f98f.bin
011a827d3b581ca5072f5a8ccae0fd6bd58e636a0b10abfd605a1526900313e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF98F 10768 bytes
font_02_sfnt_off00011df9.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF9 4324 bytes

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