Malicious PDF — malware analysis report

Static analysis result for SHA-256 676823ea24e069f5…

MALICIOUS

PDF

69.4 KB Created: 2021-09-05 07:29:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3af2843287c0c929628db1afd648532a SHA-1: af218f70c32853c0a1a63fb4010328d567fe5fd3 SHA-256: 676823ea24e069f58d50f9a450240ef2f0e83a752fb62a7e50e7ee6b6eb816a3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm with numerous URLs pointing to potentially compromised WordPress sites, suggesting an attempt to lure users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates these links are on disposable hosting, further increasing suspicion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://ceilford.org/wp-content/plugins/super-forms/uploads/php/files/10c107afa8020b17f417c1c8e9db6a1a/73855344356.pdf In PDF document text
    • http://chromoink.com/updates/file/70625824386.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/5202602458.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607f27f043451---40907068992.pdfIn PDF document text
    • https://arenda1s.ru/wp-content/plugins/super-forms/uploads/php/files/82e35100f60a3f53c8a757caf92f8a7f/26456139369.pdfIn PDF document text
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/278b358037ca6c7120cb5e662254bd53/papipuwonezugedevasuj.pdfIn PDF document text
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606c961e9b95b---ximowosujuzotivemex.pdfIn PDF document text
    • https://1tlstar.com/storage/uploads/files/16080725396.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/jexubetowedenipug.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210822020517.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/56973532811.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/2bc6cc01c3b071426b3971681d0991ac/4366616396.pdfIn PDF document text
    • https://bibliotheque.ville.deux-montagnes.qc.ca/ckfinder/userfiles/files/kabopipinajijetivevaras.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/54298841456.pdfIn PDF document text
    • http://mujuerp.com/uploads/ckeditor/files/20210701011149.pdfIn PDF document text
    • http://salkim.com/userfiles/file/88285843473.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/furezejoxuti.pdfIn PDF document text
    • https://janeunchained.com/wp-content/plugins/super-forms/uploads/php/files/iutc1d2nki440n7tcf92j598lp/pofakelijudabuzisikinow.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/32764555726.pdfIn PDF document text
    • https://porterbrothersltd.com/app/webroot/uploads/kudedowegejo.pdfIn PDF document text
    • http://korsorlampang.net/user_img/files/79148909628.pdfIn PDF document text
    • http://abwcoliseum.com/uploads/files/66056347664.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=analgesic+antipyretic+anti+inflammatory+drugs+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_off0000b179.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB179 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c98b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98B 14612 bytes
SHA-256: 5865d03fd2b64d86c5f1e727b391c7b216fb6c0273dabe96073ec794dcba6a0f
font_02_sfnt_off0000ee3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3B 11160 bytes
SHA-256: f1d07d0648e7fd517481131a93d4e244826d63c016ae24316886fc8ba9ae562b

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