Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bf0b3b3dd8b304…

MALICIOUS

PDF

84.0 KB Created: 2021-08-15 00:01:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 784e05dade2fb441c9b426340105d8f6 SHA-1: 5f0022afa5c72212c7ca4944d6a9bd1d0dc57bcb SHA-256: a6bf0b3b3dd8b304f0ea413986f75a22136e4257afe50bcd3b97fd4d73ad8ffe
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which are part of a link farm hosted on disposable or compromised domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing sites or download further malware. The embedded JavaScript is likely responsible for executing the redirection or payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://irlanc.ru/uplcv?utm_term=bizim+%C3%A7iftlik+sahil+apk+%28para+hilesi%29 PDF link annotation
    • http://tsradviseurs.nl/mailing/images/photo/file/togunimepisebajox.pdfIn PDF document text
    • http://maduraicaterers.com/app/webroot/js/ckfinder/userfiles/files/navedepesuladokelodapup.pdfIn PDF document text
    • https://jgmurphy.com/wp-content/plugins/super-forms/uploads/php/files/bd6a19ff78e910ecf219011797f206af/34330544687.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/u0vd4nemf6hu2gpqk8a8decg24/kufanimakafipewoj.pdfIn PDF document text
    • http://xdata.pl/app/webroot/img/ckf/files/24865362155.pdfIn PDF document text
    • https://betentour.com/sites/default/files/file/juzafig.pdfIn PDF document text
    • http://luckdidea.com/ckfinder/images_store/files/sukobizemod.pdfIn PDF document text
    • http://buren-kompanie.de/userfiles/files/rokajevuferewomaja.pdfIn PDF document text
    • http://box8websites.com/ckfinder/userfiles/files/24780228470.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/37559904345.pdfIn PDF document text
    • https://www.acetechnology.co.in/wp-content/plugins/super-forms/uploads/php/files/mej6reimmeoi6o7n11lt81g5om/86042129244.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c86c51490b---47938751133.pdfIn PDF document text
    • http://uat.ideadunes.com/projects/ideadunes-portfolio-site/wp-content/plugins/formcraft/file-upload/server/content/files/160bf0e8953ba4---60418609092.pdfIn PDF document text
    • https://www.lowdoc-loans.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160be74cb924c5---sujajexodelejelu.pdfIn PDF document text
    • http://portaldeaquidauana.com.br/ckfinder/userfiles/files/39359963781.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/baspb095ig8l85fj0ov0s5kul6/batidaruwuvupalebeka.pdfIn PDF document text
    • https://livre-d-art.com/ckfinder/userfiles/files/40015074910.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/tabovibujivubemaligobazu.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609255afb14b6---sepafazekefugobenag.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/xuduwilurolomapemeku.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f13c5eebef---lebera.pdfIn PDF document text
    • https://digidatadecolombia.com/wp-content/plugins/super-forms/uploads/php/files/e74fc711b8736196b4c24b0f079774fd/selumipoveranagotamap.pdfIn PDF document text
    • https://thetitangroup.ca/wp-content/plugins/super-forms/uploads/php/files/653f8e6399f54e2eddb2c14a712c928b/99694160658.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1607768e98e636---7898492676.pdfIn PDF document text
    • http://lamekatus.ee/uploads/ckeditor/files/97840180391.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d688.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD688 1672 bytes
SHA-256: 3f1748778f03e7b7e2d3a6c88ca15ef060a02f224cd71155e662fde9dd4c56c7
font_01_sfnt_off0000de7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE7B 10956 bytes
SHA-256: 82444435497277eed0cd95cb992c1674e4b4a29d3dbab98ac970b8330d915fef
font_02_sfnt_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001102a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102A 18900 bytes
SHA-256: ab93c690caf83d2dfe349879fb7c1890342dce603c5f098de095c8fbe97ef276