Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef81360b3ac6fddc…

MALICIOUS

PDF

100.7 KB Created: 2021-09-06 01:50:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: bf6bbf4f2469247c1eae2507a9b252fc SHA-1: 72e14b6cc50ab42602530adccdd368720d96bd20 SHA-256: ef81360b3ac6fddc3b09cbd23f2ad3c6d6d4d2790f28b8958d684515617b6233
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, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs pointing to compromised CMS upload directories. These links likely serve as redirects to malicious sites, aiming to trick users into downloading further payloads or submitting sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://minhquoc.vn/ckfinder/userfiles/files/berig.pdf In PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/guhl5bjntvtrj6t8p96k9gnkhn/bokime.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9d4126c4f---3248732733.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/1d54ed6bd540d8c36627640fe549d8dd/sufopegos.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16087cb269c10e---44405960821.pdfIn PDF document text
    • http://score1forspencer.com/clients/4/45/4587145e2679cb7673d0e21b436e5c25/File/jitepej.pdfIn PDF document text
    • http://metisentry.net/ckfinder/userfiles/files/sefilidijedi.pdfIn PDF document text
    • http://carszana.com/image/upload/File/joxixapemuxotenevujizuvaz.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/plkicio60ritc6rjv3a9gnpkm9/27007988208.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bb8bbf44732---papof.pdfIn PDF document text
    • http://imaginove.eu/data/Files/kozirasamizotixokume.pdfIn PDF document text
    • http://ehsclassof88.com/clients/7/7f/7f6c4973f16106f9a1f2948091db50b4/File/loganuta.pdfIn PDF document text
    • http://automsystem.com/UploadFile/file/20210808091347730.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16077c1f5d0c61---zubibif.pdfIn PDF document text
    • https://assurancemauricie.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610348058915c---43602187228.pdfIn PDF document text
    • http://3dprofi.net/images/uploads/file/7958585764.pdfIn PDF document text
    • http://studiotecnicofrisoli.com/userfiles/files/foboxusoretot.pdfIn PDF document text
    • https://alirezamirmohammadi.com/images/upload/files/7849363068.pdfIn PDF document text
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b37bf93b2c5---nenexakatokawo.pdfIn PDF document text
    • https://12tiga.com/contents/files/62751929254.pdfIn PDF document text
    • http://kovove-ploty-brany-zabradli.cz/UserFiles/File/xinarimozipusuveg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=metagenomics+analysis+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_off0001246d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013c7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7F 18176 bytes
SHA-256: b2c06cd074ea76101835d8dcc487b1a5bfc6f094170ba202e524207e832be949
font_02_sfnt_off00016bdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16BDB 10972 bytes
SHA-256: 5cd2fed0be8e9be5832d16674728acf980c09fa2cdb94dfac34604992537e4a9

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