Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcfc40f0d6905aee…

MALICIOUS

PDF

90.0 KB Created: 2021-09-06 13:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: b5fe7edb36e0c6b9b15b236bdf622599 SHA-1: 80b3539bf56801603fd23ad4c97332bbd8ec35b1 SHA-256: fcfc40f0d6905aeef8b45da497ce513aec4d7a0010d8c2dd7b83c3e0b46c3cb4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, but the heuristic firings strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://alkhairi.co.uk/wp-content/plugins/super-forms/uploads/php/files/e4b66f9df646d56db5cf5e4a0e2ecd98/71831128450.pdf In PDF document text
    • http://go-trec.com/wp-content/plugins/super-forms/uploads/php/files/ktq1ft1dhlfaruo9mtm0jo0j8r/nafuvuzidujuxabababe.pdfIn PDF document text
    • http://stolizstekla.ru/userfiles/file/kosiromifilitefibudifa.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/h1amk9gh4k9tdbhkg8ti04u884/gibufutaxijan.pdfIn PDF document text
    • http://7166867.ru/ckfinder/userfiles/files/rulusu.pdfIn PDF document text
    • http://standdominica.org/files/files/62796106742.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093ada14eba6---50855488847.pdfIn PDF document text
    • http://xn----8sbnbd9chja.xn--p1ai/userfiles/file/2636921193.pdfIn PDF document text
    • http://travellightnepal.com/userfiles/file/52373550612.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/50126346327.pdfIn PDF document text
    • http://ristorantebiscione.com/userfiles/files/48070461503.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/31174933705.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/67490d8489ecfa0bb290cb68f181836a/momasuxutitizivezezunekob.pdfIn PDF document text
    • https://horgaszvelem.hu/ckfinder/userfiles/files/95329065062.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c74300027e---gifisawa.pdfIn PDF document text
    • http://kazenergy.kz/wp-content/plugins/formcraft/file-upload/server/content/files/16073b1a98a92d---risowevosotavol.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160adcdb395640---todugo.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/75b15dad68a816415e90c2b6fab1cd89/pogipijapugepekupab.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/40370128667.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/19899429128.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/51183373250.pdfIn PDF document text
    • http://0-50.ru/userfiles/file/9702350531.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/vunesabadaxilepitirif.pdfIn PDF document text
    • http://www.ibadirect.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d02c2456b---10593404917.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/b31bgml8ifqrdvk0isbdj0dk8c/58777561492.pdfIn PDF document text
    • http://xn--e1aaafipco3bk8gra3b.xn--p1ai/upload_picture/file/77214698611.pdfIn PDF document text
    • http://bellsazshihtzu.com/clients/878694/File/nekutumigamuvaxipovoka.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=animal+sounds+worksheet+preschoolPDF 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_off0000f8e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E4 11040 bytes
SHA-256: e163e9e6849647c1f01e1aaa9e29df64a2054877607c51e5895e147d88d289c1
font_01_sfnt_off00011277.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11277 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012a89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A89 18044 bytes
SHA-256: 263d31c1f7727fbf6be3397f1c8d9ce05bdebd2327e1831549a7149f37fcd423

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