Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b2742423f4228e…

MALICIOUS

PDF

79.5 KB Created: 2021-06-30 00:49:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 7536abad796a15317142fb20e1253a81 SHA-1: a8f9cff87ba03e57640f8196eb19eca4f35ca8c4 SHA-256: 68b2742423f4228e94d18c630b8b49032ab7b9e0801ae35a97be6197652db2c5
96 Risk Score

Malware Insights

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

This PDF document was flagged by an ML classifier as malicious. It contains a large number of links, many pointing to compromised WordPress sites and disposable hosting, suggesting it functions as a link farm. The primary goal appears to be directing users to potentially malicious external websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

Heuristics 5

  • 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 http://fenotropil.ru/userfiles/file/mewarofuwagubirix.pdf In PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/d512878d37cef715d6deaa006a0e37ae/62412847942.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a834936df51---39797054986.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4durcn91m7pfqtgdbna4i21jc0/webazivakuwapigofedexanar.pdfIn PDF document text
    • https://vieclambaohiem24h.com/upload/files/59208176558.pdfIn PDF document text
    • https://atolab.it/wp-content/plugins/super-forms/uploads/php/files/200dc77fab9e90acb372915e9fe418cd/76349744115.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/riwatizafeg.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606f6b2379488---80769004955.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086fdf8cd6d2---geposekulowomovoxufor.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/1608c752e9552f---68710088733.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cfc66d9526d---kejomotepejudoje.pdfIn PDF document text
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/622b52ea32faa051fd6d6f8dafcf346e/95477681686.pdfIn PDF document text
    • http://classtool.info/upload/files/54165840990.pdfIn PDF document text
    • https://www.tanyadantus.com/wp-content/plugins/super-forms/uploads/php/files/f5b4d6fd8ba688c0d23b72eeb8ca3d85/nomigi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/49861068517.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/34126020955.pdfIn PDF document text
    • https://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/e96ec299972cb6ad55205dbcdc743fc5/gaximoxiwosoguzefogad.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16072e3bc7629c---97919349990.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa24ec1e68---magenule.pdfIn PDF document text
    • https://m-co.de/wp-content/plugins/super-forms/uploads/php/files/v60r2kte9809niboqjnd3utf26/80542128711.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/b6bc4cc727dfa7598d2f724b0aafbae2/gawofisamupajevenuxesa.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/61843827437.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/rizupodeboxetuguzeroj.pdfIn PDF document text
    • https://bruceautoservice.com/files/file/75888131817.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=accrual+in+spanish+accountingPDF 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_off0000d201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD201 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 17472 bytes
SHA-256: baee1d2de017e3cb76ecb7604c378a90a60f000768a756c9b363187b238be822
font_02_sfnt_off000116eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116EB 10604 bytes
SHA-256: d98abe30bb13e7316a265f956dd818d98f6cf176f9b6bfddb096c1710101bb59