Malicious PDF — malware analysis report

Static analysis result for SHA-256 31510bad6dab2687…

MALICIOUS

PDF

63.8 KB Created: 2021-06-20 15:05:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf72c6a885e57fae68ca03cbf93f830c SHA-1: 004d29e62fd599c225a964e4874fa38fffe4bcfe SHA-256: 31510bad6dab26875bee99b6cfc6df4d3eaa0a3935baad38580dbe96a7b60f28
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised WordPress sites and disposable hosting domains. The embedded URLs, such as http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16084a86581bc4---redabukubimifodef.pdf, are likely used to distribute further payloads or conduct phishing attacks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/f9923a9147b5f35d48ccc6858aadca70/komopabupune.pdf
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160740911296cb---silakosozakovaporuw.pdf
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16084a86581bc4---redabukubimifodef.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/woniponefukonu.pdf
    • http://matchedtubes.de/userfiles/file/31914930151.pdf
    • https://remoteworkerclub.com/wp-content/plugins/super-forms/uploads/php/files/bbd9d57285f23502422c8fb0b1fc403a/zujokekotobewizibas.pdf
    • http://santeh.md/img/files/sugexatovuve.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b21485b7122---kitufotawofibuzadareviben.pdf
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/h2tucsqhtgh1khrinl5lr1vje3/86047996383.pdf
    • https://bd-sokolovska.eu/userfiles/file/xujovibukeropekofa.pdf
    • https://addsfly.com/userfiles/file/rosijoxodizo.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/f10bf6d43f253e8c0d4bcf5ffc7b940b/16268669071.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093455aa2eb7---boluwewagakagize.pdf
    • http://piau-po21inn.com/CKEdit/upload/files/jebumojugazikojif.pdf
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774a429725a---revawexuderilufifenazo.pdf
    • http://hanhthien.net/uploads/file/47701515765.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/f7qo11a874ihrb0o8lgq5oj3l6/jojazapadekubew.pdf
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/0ede80caedabc8ee72941ed25d52e9c6/19015929893.pdf
    • http://ptairsupply.com/userfiles/file/1755127023.pdf
    • https://kfz-gutachter-oliver-schiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c8537a46c9---pojobuli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=rick+and+morty+online+hd
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bf08.bin
45282f0f1475abe7516f3c9117eb5c628ee04bf3a42bfee29015953ef43bd834
pdf-font-stream PDF embedded font (sfnt) at offset 0xBF08 5172 bytes
font_01_sfnt_off0000d084.bin
61dd4bb614abac57bcac4e27163f16f3bacc4a8bfbebeb2506ae441250f3b0bf
pdf-font-stream PDF embedded font (sfnt) at offset 0xD084 11208 bytes