Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8219798f2f8185…

MALICIOUS

PDF

82.1 KB Created: 2021-09-07 17:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 4e5057b0f2291779113a5ff34d9a8ff8 SHA-1: 1b83fd6e565fca7d226cea622559b120796b1087 SHA-256: be8219798f2f818503f2cfec73d8c04d43fbc43f15e1ea7288fc40fe7dee1663
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=pdf+fill+in+calendar+2018 PDF link annotation
    • http://aromaonly1.com/yamituki-n/uploads/files/kuzegefupowuvazeko.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d2c714618---viwatuj.pdfIn PDF document text
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca34cee74a---juwadimizitabagan.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ac29f9ba05b---gujakewozot.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/nijuxotepasapepogo.pdfIn PDF document text
    • https://hophamthaibinh.com/upload/files/87166722683.pdfIn PDF document text
    • http://www.siscbolivia.com/admin/uploaded/fck/file/pobamatamogutimoxag.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b71f35a5a4f---75864385253.pdfIn PDF document text
    • http://debsecond.net/UserFiles/File/75346330321.pdfIn PDF document text
    • http://saxonsaxtonfamilyreunion.com/clients/f/f6/f6d0431f970e0833b0867c311dafb132/File/vogilebemerumo.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/2361eba12099a1dd351c65bd1acf00ac/56638412258.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160bb50396b098---waluvug.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/9b05b95f3b030050ac173898799df8f5/xobapil.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/pizimubodomeruronuraxe.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e8f33148510---muzifuwedemuwanaxibumiko.pdfIn PDF document text
    • https://samsunyapi.com/userfiles/files/99590038193.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/68c58ub2unkuaiagtiak1knj03/61283162227.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/pukekaf.pdfIn PDF document text
    • http://koreadramatour.com/FileData/ckfinder/files/20210805_F54BC6B245AB4D2E.pdfIn PDF document text
    • http://hzjksj.com/images/upload/File/tivejanejigopizikanewis.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/pdjgjh9e18fno594jgmlivdv03/bulus.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/b615da39da0a8a481012f8da10452183/piximomizumuz.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/9a009685a92a21f6966a26528ba186b9/42200950562.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_off0000dc0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0C 10588 bytes
SHA-256: 38bd030002ac7530cf8fc21c34e68ac5fdf2aa8e28a75341ae563f8215199e77
font_01_sfnt_off0000f460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF460 17064 bytes
SHA-256: b8175fecbdde43983bf82b05c93c5d6c6f2625d9dd98e17abf0e603fb8b5bab4
font_02_sfnt_off00012119.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12119 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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