Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c003f485fa29f2…

MALICIOUS

PDF

79.1 KB Created: 2021-09-09 11:14:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e6888279bbc0fe73aa72f62bdf673819 SHA-1: ed468be762caf40358b72da13c8b3109ac65a806 SHA-256: 98c003f485fa29f29a22b9e301e356e70f3e15d8fbbf1f3d22c92df5ba103bae
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The embedded JavaScript and numerous external URIs, including links to compromised CMS uploads and disposable hosting, suggest it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aiming to trick users into clicking through deceptive content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=how+do+i+screenshot+without+the+other+person+knowing PDF link annotation
    • http://e-sheremet.com/img/jidisolodudipulimodepekaf.pdfIn PDF document text
    • https://perkunasstudio.com/uploads/files/202109011948434240.pdfIn PDF document text
    • http://domario.ru/userfiles/file/ludiwaranowinofoga.pdfIn PDF document text
    • http://falerisztika.hu/tmp/11081683939.pdfIn PDF document text
    • http://aeusjtu.pretty-match.com/upload/files/ketaradabitawu.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/menewixaned.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/sosaxufovepidu.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613488af8c138---nineburimisesixajolo.pdfIn PDF document text
    • http://asbazainville.org/userfiles/file/xuvoxifo.pdfIn PDF document text
    • http://conhantaoankhanh.com/webroot/img/files/jowemeziworajuvedadile.pdfIn PDF document text
    • http://hotspot-usa.com/js/upload/files/73842574115.pdfIn PDF document text
    • http://stroyindustry.com/userfiles/file/40619612644.pdfIn PDF document text
    • http://ckud.handysociality.com/upload/files/84739685100.pdfIn PDF document text
    • https://creteservices.com/FCKeditor/userimages/file/76904612217.pdfIn PDF document text
    • http://www.megasaludips.com/wp-content/plugins/formcraft/file-upload/server/content/files/161300ca7adc7c---vatabonajevukonib.pdfIn PDF document text
    • http://cbstav.cz/file/rupejadip.pdfIn PDF document text
    • https://wrd13.com/force/file/63955077268.pdfIn PDF document text
    • http://amidoux-peintures.com/ckfinder/userfiles/files/18317926363.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/8fcefd5f5556a46f8501f7ac610ab2f5/depopanudoduraxaj.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/1612fa7f444582---nikokelagibepidefaj.pdfIn PDF document text
    • http://cnpair.com/userfiles/file/makuruf.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/92135878543.pdfIn PDF document text
    • https://gmnavarra.es/ckeditor/files/perujegama.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/69246372405.pdfIn PDF document text
    • http://grabnerestriche.at/33102258694.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_off0000d0a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A1 17372 bytes
SHA-256: 291ac438b989bca75c0f7a7361e1a2afdfebd97d8fe715d3dbabe14c8153b726
font_01_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 10856 bytes
SHA-256: 63b766af6bf2a26e5cfe5d66c3e050205a79ee19de563ca8e335ee9525fe3f25
font_02_sfnt_off00011602.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11602 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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