Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ec62dc7e64a4e86…

MALICIOUS

PDF

82.0 KB Created: 2021-09-17 22:49:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c5b928cb769d47d7a402d4c986c33f79 SHA-1: c3ea3324dec2288d9023538edba64b5ad6d6aaf6 SHA-256: 1ec62dc7e64a4e86c889ad8bb8bf8ea02b61035d537ec2fbcd3cc4f55fabe888
164 Risk Score

Malware Insights

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

This PDF sample was flagged as malicious by ML classifiers and ClamAV, indicating a phishing and potential trojan delivery attempt. It contains an embedded JavaScript stream and a link farm pointing to multiple disposable hosting sites, suggesting an attempt to redirect users to malicious content or downloads. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic further support the phishing and malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://skopjemuzikon.pmgrecordings.com/ckfinder/userfiles/files/95243363353.pdf In PDF document text
    • http://villaelen.it/userfiles/files/41416050532.pdfIn PDF document text
    • http://prtourusa.com/FileData/ckfinder/files/20210906_2616E8F20A44A134.pdfIn PDF document text
    • http://www.alfapilates.pl/upload/file/rigapurerifuba.pdfIn PDF document text
    • https://harrisitalia.it/uploads/file/kilirofutokobada.pdfIn PDF document text
    • http://oumkua.com/userfiles/file/85707950995.pdfIn PDF document text
    • https://ruiguoex.com/upfile/files/2021/09/13/moxizinatogapirubataki.pdfIn PDF document text
    • http://e-skala.pl/userfiles/file/11904105080.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/vavuginapoloduti.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/93726353512.pdfIn PDF document text
    • http://balcimimarlik.com/resimler/files/90671216559.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210902202134104272uleef6.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/91794189419.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161321b707e1ca---58800077324.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/wasonamederagikimo.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/jatufokujakudokupetonuwo.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/09736edaf87d9454e47165cca3d29401/96113081753.pdfIn PDF document text
    • https://texasbordervolunteers.org/userfiles/file/xubalikuzogibuk.pdfIn PDF document text
    • http://tachikawa-derma.biz/ckfinder/userfiles/files/detaraduvo.pdfIn PDF document text
    • https://pnp-studio.com/fckeditorfiles/file/xelewolulezidozebo.pdfIn PDF document text
    • http://ne-moloko.ee/wp-content/plugins/super-forms/uploads/php/files/c648cc2d0b6d9b82869220887d84fda7/3170212379.pdfIn PDF document text
    • http://tycoonmedical.com/userfiles/file/lulotetogasejanuvak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=how+to+print+pdf+in+macbookPDF 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_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 10744 bytes
SHA-256: 1fcd5faaf1f7e782d149d9cd67650f41d0cbb10ea5560b3f6b52833e9544b2a1
font_01_sfnt_off0000f55b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D6D 17632 bytes
SHA-256: fd075ca59ce7f326d8e7c2169ac32da182fc1cff9ef82936b9e67d59f671b930

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