Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbebe6aab1fd2c2c…

MALICIOUS

PDF

77.4 KB Created: 2021-09-07 20:51:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 68ffa23a12da64a2ec825a550672edc8 SHA-1: 0173b58c65fcf82dd796e7aa80d8218a836d6896 SHA-256: fbebe6aab1fd2c2c5c7c0ce1dd1ccf382b02d59a7cac32b462a1cf92fea436a7
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a large number of external URIs pointing to compromised websites, many of which host further PDF files. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates these links are likely part of a link farm designed to improve search engine ranking for malicious content, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/8ddncbgcsre0hht63uia2a02i5/kominerajidobe.pdf In PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/521a76def155d729dbfa89aeec4f46c7/70782346745.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/fugajafegagufap.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609727587ee9f---duropedeguwokone.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/felawobotoviza.pdfIn PDF document text
    • https://wickedcheesy.com/images/file/97453345449.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/70967701721.pdfIn PDF document text
    • http://codefon.hu/js/ckfinder/userfiles/files/12601351629.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/63370952267.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/kadewonipivatavulogozome.pdfIn PDF document text
    • https://biovuspharma.net/userfiles/files/sisovetikuvowitiji.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc91554db8c---zutuxanosegetu.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/28416cf2bffaf8a6f1cbe74bb890168d/39016484045.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/1ecaa37cca87bc2d8eb275dc5c358c84/80607769790.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/1606f35af6f01c---guxugezadilivon.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a256997a1ff---xomigonajaron.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ac50fec5db9---36544532174.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/54354787503.pdfIn PDF document text
    • http://bidmitt.com/img/files/file/moxet.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1f58a163f---fajofovero.pdfIn PDF document text
    • https://eprobatdz.com/ckfinder/userfiles/files/79707730628.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/48161401710.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f4b515c33---87579959119.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d25359bbe7---finusodurapuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=computer+parts+names+and+pictures+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_off0000cb2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2D 16756 bytes
SHA-256: 5410c6722dc9e4fd6a926a2818733c1297ec3dd0d3d45e97743e66b5a235ba7c
font_01_sfnt_off0000f68a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010ea1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EA1 10864 bytes
SHA-256: cbfc4fd77d176866eccda405fb21e215144328bea21c6baab8023138af0186e8

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