Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2f34fb3b6ca0d88…

MALICIOUS

PDF

145.3 KB Created: 2021-07-21 13:42:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 528c8286e9c7a2ba315096b7e9758f0f SHA-1: 3744e47e9e4a47a964f4e39ad64fcb1997484a8c SHA-256: a2f34fb3b6ca0d883cf4040597e2d7ee95800dbf11f5bfd364f35963724576c9
156 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable hosting. The presence of external URIs and link farm patterns suggests it's designed to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

Heuristics 6

  • 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.
  • 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://aquamedicasatumare.ro/ckfinder/userfiles/files/69593522693.pdf In PDF document text
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16073362659ea1---gitulumitexukejemur.pdfIn PDF document text
    • https://aljazeerahpetroleum.ae/userfiles/files/saxifadavofugugifubolu.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/muxitovobakigewowuxosi.pdfIn PDF document text
    • https://deedpoll.sg/wp-content/plugins/super-forms/uploads/php/files/c8b10c29eabd89f5c0390243922bc8f9/figifudefu.pdfIn PDF document text
    • http://www.heksan.com.pl/file/putewudobodilisenugawoj.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/94222678789.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/dd80a98d59429577bc0c0a426052e687/gojezi.pdfIn PDF document text
    • http://www.rkcomdesignservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c1edd98d3c---lekudekuvajutu.pdfIn PDF document text
    • https://digireg.org/upload/zawupekote.pdfIn PDF document text
    • https://noks.cz/wp-content/plugins/formcraft/file-upload/server/content/files/16071c0b758466---81616548091.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bfb7051e53---matob.pdfIn PDF document text
    • http://clasesholandes.com/userfiles/file/tutavoriwojikitetidat.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c7528b9b873---semedupigezorevo.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090719361543---gavilosavuvumapexunadi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/jajinikupi.pdfIn PDF document text
    • http://zlato-stribro-investice.com/upload/files/napamobegafemoxexewuwopef.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/xexupowukosedalafabuwe.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084177515043---69643300833.pdfIn PDF document text
    • http://www.dadosefatos.net.br/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb93984dd---nebituw.pdfIn PDF document text
    • http://sampsonancestry.com/clients/d/d9/d9bd9208c4e45de01aa31840e3a8c66b/File/301735589.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/1mpop9l31cnf20lfl59l95utha/46909297697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=cabbage+white+butterfly+pupaPDF 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_off0001d0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D0BC 21492 bytes
SHA-256: 7f1899372dceaf72c6669103b184abd30f3babd48ced42fcb68752b21bfa0e23
font_01_sfnt_off0002074c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2074C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00021f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21F63 10716 bytes
SHA-256: e03dca13df5c3f002aff9a18cf641c683344d3238903f5ef54545f72e750b247

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