Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cd5cc7fb95186ab…

MALICIOUS

PDF

81.7 KB Created: 2021-09-17 02:50:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 6545ca0fb0b5a106353089c2c74b337b SHA-1: a6874c39ecd7a303d66ae3e40432e261ea25b330 SHA-256: 7cd5cc7fb95186aba9b184b2fbbf8350cbaa76d7772686db917328c639165eb5
244 Risk Score

Malware Insights

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

This PDF document was detected as malicious by ClamAV and a machine learning classifier, exhibiting characteristics of a phishing and malware distribution lure. It contains embedded JavaScript and numerous links to external PDFs hosted on compromised WordPress sites and disposable domains, suggesting an attempt to redirect users to malicious content or exploit kits. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document likely prompts the user to install a fake browser update or extension.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://catamma.ru/uplcv?utm_term=ld+player+new+version+2021+free+download PDF link annotation
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf3754047f---75889001400.pdfIn PDF document text
    • http://hkalc.com/userfiles/pezudefa.pdfIn PDF document text
    • http://blueyee.com/upload/file/092016414578.pdfIn PDF document text
    • http://simsvizag.com/contentimages/file/21361716871.pdfIn PDF document text
    • https://sharidendesignasphalt.com/wp-content/plugins/super-forms/uploads/php/files/dcde39c98218b5a1ed8f9a22126b4363/taruxoxanatakirutu.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/fifegejifavamujizijuv.pdfIn PDF document text
    • http://nakakinpump.kr/fckeditor/upload/file/xoligaxezuzarewukaxebagel.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/dutudelujodatedif.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/50a2b8c68a8a6b4505ac3ed94642897d/rilafevesewaxixezajub.pdfIn PDF document text
    • http://stsmcc.org/www/js/ckfinder/userfiles/files/ritufetexapebiwiwomol.pdfIn PDF document text
    • http://ambulatorioveterinarioilghirlandaio.it/userfiles/files/ripadumomurofirekaji.pdfIn PDF document text
    • http://carbonelite.ru/file/72554990394.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/81050018598.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/46138641316.pdfIn PDF document text
    • https://computerzone.pk/file/23393969462.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/fojewusokovitakotopip.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/wofeluwodunabuwefagegak.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/2740999821.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/30720313380.pdfIn PDF document text
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/eafc91337c27d1d15908d696b4a09c1f/birekenivonanegu.pdfIn PDF document text
    • https://nwdglobal.com/ckfinder/userfiles/files/19911722786.pdfIn PDF document text
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161313c3fde718---47757883962.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16136c73bd9095---rudegubikefemoresole.pdfIn PDF document text
    • 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_off0000d8ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8BA 10912 bytes
SHA-256: fcd6aa902ac5604010cc75b4dd1f4853fed8a35f123039e000c8cc3890b39aad
font_01_sfnt_off0000f23c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF23C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4E 17844 bytes
SHA-256: 4d49e076566d85bba951d2902d511524b119120ca259c2a7dd695af13e40575c

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