Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc087d35a9f337c9…

MALICIOUS

PDF

86.2 KB Created: 2021-07-08 07:11:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: a5af14204f6927226c00c2a7e30160f4 SHA-1: 8c53fd8f9f800dd34c9479a169535f821f5113c1 SHA-256: fc087d35a9f337c9f8e74b88c7fb070980a842df858b16c7a538614e9bfdaa06
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs that point to various domains, many of which appear to be compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://pixomot.ru/uplcv?utm_term=gladiolus+color+meaning PDF link annotation
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/befipijejoposujudixibexex.pdfIn PDF document text
    • http://eske.hu/wp-content/plugins/formcraft/file-upload/server/content/files/160865f8f2851a---8639636427.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160856538a1875---18669825829.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c577242516f---87822836004.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/8d7da83339450b875278bce63b580400/83676523945.pdfIn PDF document text
    • https://grupo-bahia-real-estate.com/ckfinder/userfiles/files/kamibu.pdfIn PDF document text
    • http://bocghebinhduong.com/media/ftp/file/wizorijatamedewiga.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160b822784ce6e---litetexotadema.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/r8a21gvnpelc7bnmccenpsrdqm/tilujove.pdfIn PDF document text
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16089834c820b9---sigijirabulepovakefesiga.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/92127279536.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad881be873c---katunaxulobesuzu.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5fa94f31d---minutokot.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075f58dbfbe6---kejarotamubijuxopiwotupuv.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160abf5b46129d---mijekatekovuxabide.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/76860770817.pdfIn PDF document text
    • http://teraval.cz/res/file/85146929696.pdfIn PDF document text
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/uhr7jrn42pn29fvoio9g087non/gumonogovep.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16086b7f658182---53758253789.pdfIn PDF document text
    • https://cutletsmeat.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081e17580348---52068017587.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/3ee8d2dc3eff2b17a8c60bf15b5fcc98/bepuzozemekavitajo.pdfIn PDF document text
    • http://seksdagen.nl/userfiles/file/dosakumixijir.pdfIn PDF document text
    • http://vlajamo.cz/images/file/vobogibituko.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f97411d8a4---57069988672.pdfIn PDF document text
    • https://antae.be/app/webroot/uploads/file/29662218890.pdfIn PDF document text
    • https://alutat.com/data/file/siwopekutoxajozosoj.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4f72d481b1---gelejatimibo.pdfIn PDF document text
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910f1bc015c---lojikagudomolepibumexida.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_off0000ef93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF93 10756 bytes
SHA-256: 91b21c2a79e80dad1e56567c42da06718bb8edc57441416a5b32b6e0e082925a
font_01_sfnt_off0001080a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1080A 16600 bytes
SHA-256: fe387d8ae2be1c540c6e53790b9e9f4ecff5a57473f1a9bc20a7d1be2fff67c3
font_02_sfnt_off00013335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13335 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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