Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1fd1bf72496df2d…

MALICIOUS

PDF

102.6 KB Created: 2021-08-10 01:19:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: b24400d67c9de624a6fad2e2a6b815eb SHA-1: bc982f452a0a48ac8d933cdd5d2c18cbbb1fd331 SHA-256: c1fd1bf72496df2dbeff072e20d843f50fca651bc7fc9b27fbf7031b501d1fd7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs, such as 'https://synerhu.ru/uplcv?utm_term=certificate+of+fitness+f07+practice+test', are likely used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://synerhu.ru/uplcv?utm_term=certificate+of+fitness+f07+practice+test PDF link annotation
    • http://ithaca1966.com/clients/8/85/85e9e0a76fddb83d7689cebc6ab07fae/File/81544319464.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/vedopibilofokol.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160712737af1e6---zowoxovizimimunefigidaxok.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/lnikd9iqodlt4ssk6n0uum5n5s/91948742694.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606d7fe9c9528---kogoviperiralufezote.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a349b38c985---41282010678.pdfIn PDF document text
    • https://pergamine.com/ckfinder/userfiles/files/80223492084.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/73570075726.pdfIn PDF document text
    • https://campermagazine.tv/public/file/44772266564.pdfIn PDF document text
    • https://repetitorebi.ge/userfiles/files/63169518002.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160b0243592e3b---duvoxelamiz.pdfIn PDF document text
    • https://mabuksusu.com/contents//files/ravuxoforasajegozamoviz.pdfIn PDF document text
    • http://www.veronicaneal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608842d6cf935---rokosetalawofekefirujeb.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ptvnmgg2jl6jiji40ifsu9lqdl/49683376917.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/14822723318.pdfIn PDF document text
    • https://www.northernillumination.com/wp-content/plugins/super-forms/uploads/php/files/725b5a961cb636b7fe018f2963d750f8/sifokukiroroga.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/vozukufotis.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d1d93d27dc5---10318540156.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/72004975918.pdfIn PDF document text
    • https://gizaviation.com/uploads/files/16556236097.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/26803c4e73159c61b8caee1ed05073ee/litofuvur.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/166036cfdcef558f8b7a700b42ce69ac/15716050839.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/87097e79deff4d9b3cc4ae0b8a63a72c/munidemuxafokerom.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/387355584.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a47f66cdad3---rudeburefutul.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_off00012ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BA1 17984 bytes
SHA-256: 6e11d6e9d6205633316e5a919b3297c3497ef620439a2e7e843bc0e6bd6ee0d0
font_01_sfnt_off00015aa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA7 10632 bytes
SHA-256: e6b648510aa345729c4a1c3d5bb7572fda4c16a3b2e15a4a85a6394564e7bc30
font_02_sfnt_off0001733a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1733A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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