Malicious PDF — malware analysis report

Static analysis result for SHA-256 5010aa17f8d1cd43…

MALICIOUS

PDF

100.4 KB Created: 2021-08-04 22:00:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 92db92696a6553aa2912436be2b5da4d SHA-1: 723d583607635e0ba298f9368fcabea9aa3fb62b SHA-256: 5010aa17f8d1cd4357c62c6e0a6d265c538d9fe5ef55ab9301b3956786aef5d4
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate the PDF is part of a link farm hosted on compromised or disposable domains, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 http://extreamtuning.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1bead7143---tesenamekifow.pdf In PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d6adf8072f8---bedojifapaxatowivivabek.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/jekebiwovom.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/pasog.pdfIn PDF document text
    • http://skonasystems.com/userfiles/file/jibaxavugojixip.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210510052931505333tv4nwu.pdfIn PDF document text
    • https://batikatravels.com/userfiles/file/77228181523.pdfIn PDF document text
    • http://playbabydoll.com/userfiles/file/mabifurur.pdfIn PDF document text
    • https://kozhikodedeaf.org/admin/my_files/file/32625567306.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160d39744df417---xonifabitafilijano.pdfIn PDF document text
    • http://museeducuir.org/upload/files/33033988406.pdfIn PDF document text
    • https://roofmed.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160aa186614a2e---78679520464.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/werijavefedoz.pdfIn PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eab08d7906---tebom.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608289e9a27f1---lofonumokajirizuzuduxukus.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/0b5ce7d1a45d9420e8fd72fd7088ae7c/67070515121.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/a97b241dadaac266c2888981fb141159/nuziwinafag.pdfIn PDF document text
    • https://limberhurstgallery.com/imageuploads/file/11068467704.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/658fd1c26ec4e59dc8741efe65a4208c/86834592661.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/2943f41e261b8c8cdb18faa761e37299/96295151263.pdfIn PDF document text
    • https://oneremote.ru/wp-content/plugins/super-forms/uploads/php/files/ac54064d37b9807af0415a2770278a6e/jixap.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca5990cbd4---jafimakeviw.pdfIn PDF document text
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/2a4ipctl23q1eomqbmq227qa91/renipu.pdfIn PDF document text
    • http://vitanova-cattery.com/upload/file/xikefibibodotumulik.pdfIn PDF document text
    • https://autosaloncenter.com/uploads/file/29949880192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=architecture+portfolio+template+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_off000125e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125E5 17184 bytes
SHA-256: 138fd06d3880ea8e25450b27c06570a1fe33d1d5a57f990b8334bdd92a4944d9
font_01_sfnt_off000152fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152FC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016b13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B13 10692 bytes
SHA-256: 4e86e9aedd0b32d0bb6d7eaf2b9a928a327aa5f185f338adb2feba51ce504166

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