Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ddb73ad54d825dd…

MALICIOUS

PDF

91.4 KB Created: 2021-07-16 15:35:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f37ae6c33d43c61fdb642b1abb992baa SHA-1: 9160986a59a040cd9b702c86aa4f61bcab5c3fde SHA-256: 8ddb73ad54d825dd50c089c97f505bfbe15912e19791015f2ec3c404bf4397b7
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file that contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains. The ML classifier strongly indicates maliciousness, and the heuristic firings suggest the PDF is acting as a link farm designed to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and URL distribution point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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://oniceh.ru/uplcv?utm_term=gender+dysphoria+during+puberty PDF link annotation
    • http://xn--d1achljw0b.xn--p1ai/content/upload/wasazamikebawep.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a81dce99a64---kiwafi.pdfIn PDF document text
    • http://accronline.com/userfiles/file/vekotodi.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/8633412068.pdfIn PDF document text
    • https://consjurist.ru/uploads/files/83041810339.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/bogigenevadabirodox.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3fc786c0fb---84933162247.pdfIn PDF document text
    • https://www.groupenahno.com/wp-content/plugins/super-forms/uploads/php/files/536hivdpenmhmlno88hhk7qg64/93981605851.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/15908395732.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aea7da8dfec---dafowukuzikitenofe.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/12096227180.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608aa45d9f90b---jomosukafevekevelofi.pdfIn PDF document text
    • http://colorfusion.us/admin/images/file/surazezezevubugitijufub.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082dfec19458---42754369285.pdfIn PDF document text
    • https://imapcb.org/wp-content/plugins/super-forms/uploads/php/files/ca7a1b4c9b793bc196e577ed09af0f46/vuribevaxi.pdfIn PDF document text
    • http://vietkinggroup.com/uploads/userfiles/file/54818530771.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/5a9brd51epcj31rktd9o0im6is/67228041093.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/l8he8eu4hfd7puu09eob3jncs0/36101346889.pdfIn PDF document text
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160d63948cd2d1---kewifukerasonexati.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210702090005.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/20769000474.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/b94551c93c62498f7cca6a5105eb574f/xedetixotumogi.pdfIn PDF document text
    • http://win-sonic.com/kida2018/ck_imgs/files/34930843558.pdfIn PDF document text
    • http://coumert.com/images/file/zodetabitorovunufaveveva.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/c7f2a31e26a49656d88f3036f45d13a7/45407768721.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/488e912e08a834134d76db8d2f9ac83d/58561147652.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_off000101b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B9 17236 bytes
SHA-256: 8e0dff091f9f9a1b69ac499b1df172847bb4ea00034af13e4bb558a73b7d884c
font_01_sfnt_off00012eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ECA 11020 bytes
SHA-256: 769667a6ea4a63721056f3924bd3399e25dd546c910d99b2c00d72c65ffdbcdc
font_02_sfnt_off000147f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147F9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1