Malicious PDF — malware analysis report

Static analysis result for SHA-256 d15fd22f3ebef026…

MALICIOUS

PDF

80.0 KB Created: 2021-09-06 05:02:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a8a8bff0420055951826a10c7bffdb92 SHA-1: 90e267fdf91768d97105b32de85506567b877a78 SHA-256: d15fd22f3ebef026492203fa6bd7b48b2436412cf91c4acfa4100bd666a5a251
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and several heuristics identified the PDF as a link farm pointing to compromised websites. The embedded URLs, while some are marked benign, are part of a larger pattern of redirection to potentially malicious content. No scripts were extracted, but the structure suggests an attempt to host or link to malicious files.

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 https://thesmithgrouphouston.com/wp-content/plugins/super-forms/uploads/php/files/2462c4c96c79670dd279b839e8c9badb/54059373892.pdf In PDF document text
    • http://gibisch.biz/files/files/36262469265.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a90b17fd7---levopatugukidudezelitojef.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/3r0s9h7un6q3aoo19batnthnl6/59870467959.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/3014544904.pdfIn PDF document text
    • http://teechart.com/uploads/images/files/42807509181.pdfIn PDF document text
    • http://chocolatycakes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b56fbc4f2a3---vaxugafumufadojowemuner.pdfIn PDF document text
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1606f504da63ad---84314955092.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160947ff23674b---wuwilekenijegidapidufi.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16078b46bc0cae---96875366904.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/98391791789.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d3bf7e20548---jebum.pdfIn PDF document text
    • https://www.chartsunlimited.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160c636592fb65---pimavavukavapinugez.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/tezubezokiro.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/32301606064.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210612011044.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/66816386116.pdfIn PDF document text
    • https://zifu-tech.com/app/webroot/userfiles/files/larixujufudumif.pdfIn PDF document text
    • http://www.onekaddy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5fa79d694a---xesivid.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608783f76c9ee---7816451964.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/fvmf0miqqtamsnv5s7eq2vim62/kofuseditapixejunob.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/85411777579.pdfIn PDF document text
    • https://watertorens.nl/userfiles/file/87397746565.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/44843469812.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=amartya+sen+development+as+freedom+pdf+ebookPDF 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_off0000d725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD725 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10960 bytes
SHA-256: 00b97b5a335a09929a0ef6751901553c0e96b9f2f5dcca1fd37098de029e0cfa
font_02_sfnt_off00010881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10881 16348 bytes
SHA-256: 32a3346e195091bc9b1cbdb3e36d4eabbf4a40c0a0dd50e2f5838e11fb26fa2c

Open this report in the interactive analyzer, or submit your own file for analysis.